[N8VEM: 16647] Z180 SBC Mark IV boards arrived

John -- this looks like a pretty cool board. Is it alpha or beta (I the context of the N8VEM world) right now? I'd be willing to do a shakedown build, but can't devote more than a few hours a week to debugging. Should I wait for revision 2?

John Coffman

2013-12-10 20:41:05 UTC

Bill,

These boards are definitely -alpha- test, AKA prototypes. We hope there
will be a minimum number of circuit problems uncovered by the first
group of testers.

If you time is limited, waiting for the second production round would be
prudent.

--John

Post by p***@public.gmane.org
John -- this looks like a pretty cool board. Is it alpha or beta (I the context of the N8VEM world) right now? I'd be willing to do a shakedown build, but can't devote more than a few hours a week to debugging. Should I wait for revision 2?

Wolfgang Kabatzke

2013-12-10 19:17:43 UTC

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman

Hello John,

May I work as tester please and may I have one of these PCB? 35$ are
coming with PayPal.Is this ok?

Regards

Wolfgang

--
Dr.-Ing. Wolfgang Kabatzke
Hansastrasse 9

DE - 21 502 Geesthacht
Deutschland / Germany

Phone: +49 4152 93 18 130 NEW!!!

John Coffman

2013-12-10 20:47:52 UTC

Wolfgang,

Your payment has been received, and I will ship tomorrow.

Thank you,
--John

Hello John,
May I work as tester please and may I have one of these PCB? 35$ are
coming with PayPal.Is this ok?
Regards
Wolfgang

J. Alexander Jacocks

2013-12-10 22:01:01 UTC

John,

What does this mean, on the parts list:
C4 22-47uF 10v

22 or 47 uF depending on something else?

Thanks!
- Alex

Post by John Coffman
Wolfgang,
Your payment has been received, and I will ship tomorrow.
Thank you,
--John

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by John Coffman
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman

Hello John,
May I work as tester please and may I have one of these PCB? 35$ are
coming with PayPal.Is this ok?
Regards
Wolfgang

--
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John Coffman

2013-12-10 22:21:30 UTC

Alex,

"22-47uF 10v" just means that the value is not critical.

Any capacitor, probably electrolytic, in that range is okay. 10v means
any voltage rating 10v or higher. It is very unnecessary to go higher,
since if you look at the schematic this cap is part of the +5v power
supply. 10v allows for a little margin, and is a readily available
voltage rating. Caps in the range 22uF, 33uF, up to 47uF are also
readily available capacities.

C4 is part of the board power decoupling, and you want a capacitor to
store energy right on the board near components. Gates switching can
result in current transients, and a nearby power source can fill the
instant need. Most of the really high speed transients are handled by
the 0.1uF ceramic/monolithic caps spread all over the place, and C4 is
there to back them up.

--John

Post by J. Alexander Jacocks
John,
C4 22-47uF 10v
22 or 47 uF depending on something else?
Thanks!
- Alex
Wolfgang,
Your payment has been received, and I will ship tomorrow.
Thank you,
--John

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV

<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>

Post by John Coffman
arrived late Monday. Shakedown of these boards commences as of

now.

Post by John Coffman
With the high integration of the Z180, many functions are moved

onto the

Post by John Coffman
CPU chip. This allows interfaces for CF cards and an SD card

to be on

Post by John Coffman
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same

size as

Post by John Coffman
other N8VEM ECB boards. Because of the 4-layer design, they

cost $25

Post by John Coffman
plus shipping: $3 in the U.S., $10 internationally. Delivery

insurance

Post by John Coffman
is at the buyer's option. Paypal to the e-mail address in this

posting

Post by John Coffman
is the preferred form of payment.
--John Coffman

Hello John,
May I work as tester please and may I have one of these PCB? 35$ are
coming with PayPal.Is this ok?
Regards
Wolfgang

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J. Alexander Jacocks

2013-12-17 04:27:58 UTC

All,

I just uploaded a BoM, in Excel format, using Mouser part numbers. There
are a couple of blanks, mostly headers, since I have enough of those to
last me until doomsday.

Hopefully, this might be of use to someone.

- Alex

Post by John Coffman
Alex,
"22-47uF 10v" just means that the value is not critical.
Any capacitor, probably electrolytic, in that range is okay. 10v means
any voltage rating 10v or higher. It is very unnecessary to go higher,
since if you look at the schematic this cap is part of the +5v power
supply. 10v allows for a little margin, and is a readily available
voltage rating. Caps in the range 22uF, 33uF, up to 47uF are also
readily available capacities.
C4 is part of the board power decoupling, and you want a capacitor to
store energy right on the board near components. Gates switching can
result in current transients, and a nearby power source can fill the
instant need. Most of the really high speed transients are handled by
the 0.1uF ceramic/monolithic caps spread all over the place, and C4 is
there to back them up.
--John

Post by J. Alexander Jacocks
John,
C4 22-47uF 10v
22 or 47 uF depending on something else?
Thanks!
- Alex
Wolfgang,
Your payment has been received, and I will ship tomorrow.
Thank you,
--John

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by John Coffman
arrived late Monday. Shakedown of these boards commences as of

now.

Post by John Coffman
With the high integration of the Z180, many functions are moved

onto the

Post by John Coffman
CPU chip. This allows interfaces for CF cards and an SD card

to be on

Post by John Coffman
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same

size as

Post by John Coffman
other N8VEM ECB boards. Because of the 4-layer design, they

cost $25

Post by John Coffman
plus shipping: $3 in the U.S., $10 internationally. Delivery

insurance

Post by John Coffman
is at the buyer's option. Paypal to the e-mail address in this

posting

Post by John Coffman
is the preferred form of payment.
--John Coffman

Hello John,
May I work as tester please and may I have one of these PCB? 35$

are

Post by Wolfgang Kabatzke
coming with PayPal.Is this ok?
Regards
Wolfgang

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John Coffman

2013-12-17 05:46:56 UTC

Even if not ordering from Mouser, sometimes cross-checking data sheets
is a help to people.

Thank you,
--John

Post by J. Alexander Jacocks
All,
I just uploaded a BoM, in Excel format, using Mouser part numbers.
There are a couple of blanks, mostly headers, since I have enough of
those to last me until doomsday.
Hopefully, this might be of use to someone.
- Alex
Alex,
"22-47uF 10v" just means that the value is not critical.
Any capacitor, probably electrolytic, in that range is okay. 10v means
any voltage rating 10v or higher. It is very unnecessary to go higher,
since if you look at the schematic this cap is part of the +5v power
supply. 10v allows for a little margin, and is a readily available
voltage rating. Caps in the range 22uF, 33uF, up to 47uF are also
readily available capacities.
C4 is part of the board power decoupling, and you want a capacitor to
store energy right on the board near components. Gates switching can
result in current transients, and a nearby power source can fill the
instant need. Most of the really high speed transients are handled by
the 0.1uF ceramic/monolithic caps spread all over the place, and C4 is
there to back them up.
--John

Post by J. Alexander Jacocks
John,
C4 22-47uF 10v
22 or 47 uF depending on something else?
Thanks!
- Alex
On Tue, Dec 10, 2013 at 3:47 PM, John Coffman
Wolfgang,
Your payment has been received, and I will ship tomorrow.
Thank you,
--John

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV

<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>

Post by John Coffman
arrived late Monday. Shakedown of these boards commences

as of

Post by J. Alexander Jacocks
now.

Post by John Coffman
With the high integration of the Z180, many functions are

moved

Post by J. Alexander Jacocks
onto the

Post by John Coffman
CPU chip. This allows interfaces for CF cards and an SD card

to be on

Post by John Coffman
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm,

same

Post by J. Alexander Jacocks
size as

Post by John Coffman
other N8VEM ECB boards. Because of the 4-layer design, they

cost $25

Post by John Coffman
plus shipping: $3 in the U.S., $10 internationally.

Delivery

Post by J. Alexander Jacocks
insurance

Post by John Coffman
is at the buyer's option. Paypal to the e-mail address

in this

Post by J. Alexander Jacocks
posting

Post by John Coffman
is the preferred form of payment.
--John Coffman

Hello John,
May I work as tester please and may I have one of these

PCB? 35$ are

Post by Wolfgang Kabatzke
coming with PayPal.Is this ok?
Regards
Wolfgang

--
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Google

Post by J. Alexander Jacocks
Groups "N8VEM" group.
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Post by J. Alexander Jacocks
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Dr. Wolfgang Kabatzke

2013-12-17 09:30:55 UTC

Hi John,

the PCB didnŽt arrived me yet....

I studied the design and I have an idea for the next version of Mark IV.

What do You think about changing U28 from 74LS682 to 74LS688 (DL8121D,
AMZ8121, 74HC688))? I use this IC often because I have problems to order
74ls682. And: the /IORQ You may connect direct as Gate-Input to 74LS688.
You can then delete U19C and U19D...

I think this works.

Best regards

Wolfgang

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV
<
http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman

John Coffman

2013-12-17 19:39:31 UTC

Wolfgang,

I am aware of the LS688, and in several ways it is very useful,
especially with that "enable" input. For I/O device selection, I prefer
to use the LS682 because the "Qx" inputs have internal 20K pull-up
resistors. This removes the need for a pull-up resistor pack, which,
saves board space.

On the SBC Mark IV, you will also note the use of MAX233, instead of the
more common MAX232. Again, this is a space-saving choice to remove the
need for external support components.

--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didn´t arrived me yet....
I studied the design and I have an idea for the next version of Mark IV.
What do You think about changing U28 from 74LS682 to 74LS688 (DL8121D,
AMZ8121, 74HC688))? I use this IC often because I have problems to
order 74ls682. And: the /IORQ You may connect direct as Gate-Input to
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
To All,
The first boards for the Z180 based SBC Mark IV
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>>
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman
--
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J. Alexander Jacocks

2013-12-26 23:25:00 UTC

John,

I have completed my basic build of the board. If I'm using a 33 MHz
Z8S180, I should use a 12.288 MHz oscillator, I'd assume, to yield a ~24.5
MHz operating frequency. To test, I'd assume that P3 takes the standard
N8VEM cable, at 12800 bps, based on the testing page? I noticed that the
12.288 MHz frequency isn't listed. That frequency will be hard to match.
I also bought an 18.432 MHz crystal, but I'd suspect that my 33 MHz Z180
will probably not over clock to ~36 MHz.

Are there any other ways to change the speed of the serial interface?

Any other testing suggestions would be welcome.

Thanks!
- Alex

Post by John Coffman
Wolfgang,
I am aware of the LS688, and in several ways it is very useful,
especially with that "enable" input. For I/O device selection, I prefer
to use the LS682 because the "Qx" inputs have internal 20K pull-up
resistors. This removes the need for a pull-up resistor pack, which,
saves board space.
On the SBC Mark IV, you will also note the use of MAX233, instead of the
more common MAX232. Again, this is a space-saving choice to remove the
need for external support components.
--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didnŽt arrived me yet....
I studied the design and I have an idea for the next version of Mark IV.
What do You think about changing U28 from 74LS682 to 74LS688 (DL8121D,
AMZ8121, 74HC688))? I use this IC often because I have problems to
order 74ls682. And: the /IORQ You may connect direct as Gate-Input to
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
To All,
The first boards for the Z180 based SBC Mark IV
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by Dr. Wolfgang Kabatzke
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman
--
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J. Alexander Jacocks

2013-12-27 15:18:12 UTC

To follow up my own email, I loaded the test firmware, and don't see the
main LED change color, or the SD card LED light up. At power on, the
central LED is green, and remains that way. It never changes to red,
indicating a halt.

I have not, yet, attempted serial communications, as I can't find a
machine/comms program that is capable of 12800 bps operations, though I
suspect that Windows could do it. I'm using the 12.288 MHz crystal, and a
33 MHz Z180, for theoretical 24.5 MHz operation.

Thanks!
- Alex

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by Dr. Wolfgang Kabatzke
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

$25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman
--
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John Coffman

2013-12-27 16:22:29 UTC

Alex,

Wayne and I are at the stage that two sets of s/w need to merge. How we
will do that will play out over the next couple of days.

I, too, have a 33Mhz Z180 -- the "advanced S-class processor" -- in the
words of Setup. For the moment, run at one of the "magic" frequencies
required by the lower Z180 processors (in Mhz):

6.144
9.216
12.288
18.432

At reset, the CPU comes up running at 1/2 osc. It may be shifted to 1x
osc. if it is an SL1960 processor or higher. If it is the "advanced"
processor, it may be shifted to 2x osc.

However, RAM and ROM speeds actually determine how fast one can run.
Wait states will play a role at the higher speeds. You may safely use
the 12Mhz and 18Mhz oscillators for board testing.

Later today I will post a demonstration "setup" program on the Wiki.

===========

Reading your later e-mail: That "TEST1.HEX" requires a 9.216Mhz
oscillator, and communicates at 9600bps. You got it right, the CPU is
trying to communicate at 4/3 * 9600 --> 12800bps. That is a
non-standard rate that no terminal program is going to use. If you are
in a hurry, modify the source code to use DR=0 in the cntlb0 reg. and a
new SSS=2 value. That should set you up (at 1/2osc) for 9600bps.

--John

[BTW: SDCC 3.3.0 is to be avoided. Use 3.0.0, known to be good.]

Post by J. Alexander Jacocks
John,
I have completed my basic build of the board. If I'm using a 33 MHz
Z8S180, I should use a 12.288 MHz oscillator, I'd assume, to yield a
~24.5 MHz operating frequency. To test, I'd assume that P3 takes the
standard N8VEM cable, at 12800 bps, based on the testing page? I
noticed that the 12.288 MHz frequency isn't listed. That frequency
will be hard to match. I also bought an 18.432 MHz crystal, but I'd
suspect that my 33 MHz Z180 will probably not over clock to ~36 MHz.
Are there any other ways to change the speed of the serial interface?
Any other testing suggestions would be welcome.
Thanks!
- Alex
Wolfgang,
I am aware of the LS688, and in several ways it is very useful,
especially with that "enable" input. For I/O device selection, I prefer
to use the LS682 because the "Qx" inputs have internal 20K pull-up
resistors. This removes the need for a pull-up resistor pack, which,
saves board space.
On the SBC Mark IV, you will also note the use of MAX233, instead of the
more common MAX232. Again, this is a space-saving choice to remove the
need for external support components.
--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didn´t arrived me yet....
I studied the design and I have an idea for the next version of

Mark IV.

Post by Dr. Wolfgang Kabatzke
What do You think about changing U28 from 74LS682 to 74LS688

(DL8121D,

Post by Dr. Wolfgang Kabatzke
AMZ8121, 74HC688))? I use this IC often because I have problems to
order 74ls682. And: the /IORQ You may connect direct as

Gate-Input to

Post by Dr. Wolfgang Kabatzke
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
To All,
The first boards for the Z180 based SBC Mark IV

<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>>

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards commences as

of now.

Post by Dr. Wolfgang Kabatzke
With the high integration of the Z180, many functions are moved
onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they

cost $25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally. Delivery
insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman
--
You received this message because you are subscribed to the Google
Groups "N8VEM" group.
To unsubscribe from this group and stop receiving emails from

it, send

Post by Dr. Wolfgang Kabatzke
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J. Alexander Jacocks

2013-12-27 21:53:38 UTC

John,

I have yet to update to the test firmware #2, but I am still having issues
with #1. I get no output from the serial port, at 19200 bps (~18 MHz
crystal), and the SD card write protect LED never lights, and the central
LED never switches to red, indicating a halted CPU.

Where do you suggest that I test? I have a logic probe and multimeter
handy.

Thanks!
- Alex

Post by John Coffman
Alex,
Wayne and I are at the stage that two sets of s/w need to merge. How we
will do that will play out over the next couple of days.
I, too, have a 33Mhz Z180 -- the "advanced S-class processor" -- in the
words of Setup. For the moment, run at one of the "magic" frequencies
6.144
9.216
12.288
18.432
At reset, the CPU comes up running at 1/2 osc. It may be shifted to 1x
osc. if it is an SL1960 processor or higher. If it is the "advanced"
processor, it may be shifted to 2x osc.
However, RAM and ROM speeds actually determine how fast one can run.
Wait states will play a role at the higher speeds. You may safely use
the 12Mhz and 18Mhz oscillators for board testing.
Later today I will post a demonstration "setup" program on the Wiki.
===========
Reading your later e-mail: That "TEST1.HEX" requires a 9.216Mhz
oscillator, and communicates at 9600bps. You got it right, the CPU is
trying to communicate at 4/3 * 9600 --> 12800bps. That is a
non-standard rate that no terminal program is going to use. If you are
in a hurry, modify the source code to use DR=0 in the cntlb0 reg. and a
new SSS=2 value. That should set you up (at 1/2osc) for 9600bps.
--John
[BTW: SDCC 3.3.0 is to be avoided. Use 3.0.0, known to be good.]

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didnŽt arrived me yet....
I studied the design and I have an idea for the next version of

Mark IV.

Post by Dr. Wolfgang Kabatzke
What do You think about changing U28 from 74LS682 to 74LS688

(DL8121D,

Post by Dr. Wolfgang Kabatzke
AMZ8121, 74HC688))? I use this IC often because I have problems to
order 74ls682. And: the /IORQ You may connect direct as

Gate-Input to

Post by Dr. Wolfgang Kabatzke
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
To All,
The first boards for the Z180 based SBC Mark IV

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by J. Alexander Jacocks
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards commences as

of now.

Post by Dr. Wolfgang Kabatzke
With the high integration of the Z180, many functions are moved
onto the
CPU chip. This allows interfaces for CF cards and an SD card

Post by Dr. Wolfgang Kabatzke
be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same
size as
other N8VEM ECB boards. Because of the 4-layer design, they

cost $25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally. Delivery
insurance
is at the buyer's option. Paypal to the e-mail address in this
posting
is the preferred form of payment.
--John Coffman
--
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Groups "N8VEM" group.
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it, send

Post by Dr. Wolfgang Kabatzke
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John Coffman

2013-12-28 02:37:28 UTC

Alex,

You at least should be seeing garbage on the terminal screen from
mis-matched baud rates. Using a 12.288Mhz oscillator, the test program
pre-scales the clock/2 by a factor of 30 before dividing by 16.

12288000/2 /30 /16 --> 12800

The SDcard LED is not lit until just before the 'halt' instruction. You
are not getting that far.

Wayne had an issue with the /RESET signal not clearing U31 (ROM.sch).
If this 74LS174 does not reset to 00000, you will not be able to read
the ROM at boot time. This is the first place to look for a bad trace,
bad solder joint, and the like. The /RESET signal comes from U25.18
(LS240, pin 18).

Also, are the P11 and P12 jumpers set correctly for FLASH memory (2-3)
or EPROM (1-2)?

Keep me posted.

--John

Post by J. Alexander Jacocks
John,
I have yet to update to the test firmware #2, but I am still having
issues with #1. I get no output from the serial port, at 19200 bps
(~18 MHz crystal), and the SD card write protect LED never lights, and
the central LED never switches to red, indicating a halted CPU.
Where do you suggest that I test? I have a logic probe and multimeter
handy.
Thanks!
- Alex
Alex,
Wayne and I are at the stage that two sets of s/w need to merge.
How we
will do that will play out over the next couple of days.
I, too, have a 33Mhz Z180 -- the "advanced S-class processor" -- in the
words of Setup. For the moment, run at one of the "magic" frequencies
6.144
9.216
12.288
18.432
At reset, the CPU comes up running at 1/2 osc. It may be shifted to 1x
osc. if it is an SL1960 processor or higher. If it is the "advanced"
processor, it may be shifted to 2x osc.
However, RAM and ROM speeds actually determine how fast one can run.
Wait states will play a role at the higher speeds. You may safely use
the 12Mhz and 18Mhz oscillators for board testing.
Later today I will post a demonstration "setup" program on the Wiki.
===========
Reading your later e-mail: That "TEST1.HEX" requires a 9.216Mhz
oscillator, and communicates at 9600bps. You got it right, the CPU is
trying to communicate at 4/3 * 9600 --> 12800bps. That is a
non-standard rate that no terminal program is going to use. If you are
in a hurry, modify the source code to use DR=0 in the cntlb0 reg. and a
new SSS=2 value. That should set you up (at 1/2osc) for 9600bps.
--John
[BTW: SDCC 3.3.0 is to be avoided. Use 3.0.0, known to be good.]

takes the

Post by J. Alexander Jacocks
standard N8VEM cable, at 12800 bps, based on the testing page? I
noticed that the 12.288 MHz frequency isn't listed. That frequency
will be hard to match. I also bought an 18.432 MHz crystal, but I'd
suspect that my 33 MHz Z180 will probably not over clock to ~36 MHz.
Are there any other ways to change the speed of the serial

interface?

Post by J. Alexander Jacocks
Any other testing suggestions would be welcome.
Thanks!
- Alex
On Tue, Dec 17, 2013 at 2:39 PM, John Coffman
Wolfgang,
I am aware of the LS688, and in several ways it is very useful,
especially with that "enable" input. For I/O device

selection, I

Post by J. Alexander Jacocks
prefer
to use the LS682 because the "Qx" inputs have internal 20K

pull-up

Post by J. Alexander Jacocks
resistors. This removes the need for a pull-up resistor

pack, which,

Post by J. Alexander Jacocks
saves board space.
On the SBC Mark IV, you will also note the use of MAX233,

instead

Post by J. Alexander Jacocks
of the
more common MAX232. Again, this is a space-saving choice to remove the
need for external support components.
--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didn´t arrived me yet....
I studied the design and I have an idea for the next

version of

Post by J. Alexander Jacocks
Mark IV.

Post by Dr. Wolfgang Kabatzke
What do You think about changing U28 from 74LS682 to 74LS688

(DL8121D,

Post by Dr. Wolfgang Kabatzke
AMZ8121, 74HC688))? I use this IC often because I have

problems to

Post by Dr. Wolfgang Kabatzke
order 74ls682. And: the /IORQ You may connect direct as

Gate-Input to

Post by Dr. Wolfgang Kabatzke
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
Am Dienstag, 10. Dezember 2013 04:53:40 UTC+1 schrieb John
To All,
The first boards for the Z180 based SBC Mark IV

<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>>

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards

commences as

Post by J. Alexander Jacocks
of now.

Post by Dr. Wolfgang Kabatzke
With the high integration of the Z180, many functions

are moved

Post by Dr. Wolfgang Kabatzke
onto the
CPU chip. This allows interfaces for CF cards and an

SD card to

Post by Dr. Wolfgang Kabatzke
be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken

for.

Post by Dr. Wolfgang Kabatzke
The Z180 SBC Mark IV's are 4-layer boards, 100mm x

160mm, same

Post by Dr. Wolfgang Kabatzke
size as
other N8VEM ECB boards. Because of the 4-layer

design, they

Post by J. Alexander Jacocks
cost $25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally.

Delivery

Post by Dr. Wolfgang Kabatzke
insurance
is at the buyer's option. Paypal to the e-mail

address in this

Post by Dr. Wolfgang Kabatzke
posting
is the preferred form of payment.
--John Coffman
--
You received this message because you are subscribed to

the Google

Post by Dr. Wolfgang Kabatzke
Groups "N8VEM" group.
To unsubscribe from this group and stop receiving emails from

it, send

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To post to this group, send email to
Visit this group at http://groups.google.com/group/n8vem.
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https://groups.google.com/groups/opt_out.

Post by J. Alexander Jacocks
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J. Alexander Jacocks

2013-12-28 04:16:42 UTC

John,

I believe that I have the jumpers set on the board properly for the
AM29F040B EEPROM that I'm using. I have set them the following way:

P1: 1-2
P2: no jumper
P4: 3-4, 11-12 (FCI SD card adapter)
P10: 5-6
P11: 2-3
P12: 2-3

I couldn't find a full reference to the values for P1 and P2, but took them
from the picture of your board. I also can't see any bad joints from U25
pin 18. I also switched to the 18 MHz crystal, so that I could use a bit
rate of 19200 bps.

Thanks!
- Alex

Post by John Coffman
Alex,
You at least should be seeing garbage on the terminal screen from
mis-matched baud rates. Using a 12.288Mhz oscillator, the test program
pre-scales the clock/2 by a factor of 30 before dividing by 16.
12288000/2 /30 /16 --> 12800
The SDcard LED is not lit until just before the 'halt' instruction. You
are not getting that far.
Wayne had an issue with the /RESET signal not clearing U31 (ROM.sch).
If this 74LS174 does not reset to 00000, you will not be able to read
the ROM at boot time. This is the first place to look for a bad trace,
bad solder joint, and the like. The /RESET signal comes from U25.18
(LS240, pin 18).
Also, are the P11 and P12 jumpers set correctly for FLASH memory (2-3)
or EPROM (1-2)?
Keep me posted.
--John

frequencies

Post by J. Alexander Jacocks
6.144
9.216
12.288
18.432
At reset, the CPU comes up running at 1/2 osc. It may be shifted to 1x
osc. if it is an SL1960 processor or higher. If it is the "advanced"
processor, it may be shifted to 2x osc.
However, RAM and ROM speeds actually determine how fast one can run.
Wait states will play a role at the higher speeds. You may safely

use

Post by J. Alexander Jacocks
the 12Mhz and 18Mhz oscillators for board testing.
Later today I will post a demonstration "setup" program on the Wiki.
===========
Reading your later e-mail: That "TEST1.HEX" requires a 9.216Mhz
oscillator, and communicates at 9600bps. You got it right, the CPU

Post by J. Alexander Jacocks
trying to communicate at 4/3 * 9600 --> 12800bps. That is a
non-standard rate that no terminal program is going to use. If you are
in a hurry, modify the source code to use DR=0 in the cntlb0 reg. and a
new SSS=2 value. That should set you up (at 1/2osc) for 9600bps.
--John
[BTW: SDCC 3.3.0 is to be avoided. Use 3.0.0, known to be good.]

Post by J. Alexander Jacocks
John,
I have completed my basic build of the board. If I'm using a 33

MHz

Post by J. Alexander Jacocks
Z8S180, I should use a 12.288 MHz oscillator, I'd assume, to yield

Post by J. Alexander Jacocks
~24.5 MHz operating frequency. To test, I'd assume that P3

takes the

I'd

Post by J. Alexander Jacocks
suspect that my 33 MHz Z180 will probably not over clock to ~36

MHz.

Post by J. Alexander Jacocks
Are there any other ways to change the speed of the serial

interface?

selection, I

Post by J. Alexander Jacocks
prefer
to use the LS682 because the "Qx" inputs have internal 20K

pull-up

Post by J. Alexander Jacocks
resistors. This removes the need for a pull-up resistor

pack, which,

Post by J. Alexander Jacocks
saves board space.
On the SBC Mark IV, you will also note the use of MAX233,

instead

Post by J. Alexander Jacocks
of the
more common MAX232. Again, this is a space-saving choice to
remove the
need for external support components.
--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didnŽt arrived me yet....
I studied the design and I have an idea for the next

version of

Post by J. Alexander Jacocks
Mark IV.

Post by Dr. Wolfgang Kabatzke
What do You think about changing U28 from 74LS682 to 74LS688

(DL8121D,

Post by Dr. Wolfgang Kabatzke
AMZ8121, 74HC688))? I use this IC often because I have

problems to

Post by Dr. Wolfgang Kabatzke
order 74ls682. And: the /IORQ You may connect direct as

Gate-Input to

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by J. Alexander Jacocks
<

http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards

commences as

Post by J. Alexander Jacocks
of now.

Post by Dr. Wolfgang Kabatzke
With the high integration of the Z180, many functions

are moved

Post by Dr. Wolfgang Kabatzke
onto the
CPU chip. This allows interfaces for CF cards and an

SD card to

Post by Dr. Wolfgang Kabatzke
be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken

for.

Post by Dr. Wolfgang Kabatzke
The Z180 SBC Mark IV's are 4-layer boards, 100mm x

160mm, same

Post by Dr. Wolfgang Kabatzke
size as
other N8VEM ECB boards. Because of the 4-layer

design, they

Post by J. Alexander Jacocks
cost $25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally.

Delivery

Post by Dr. Wolfgang Kabatzke
insurance
is at the buyer's option. Paypal to the e-mail

address in this

Post by Dr. Wolfgang Kabatzke
posting
is the preferred form of payment.
--John Coffman
--
You received this message because you are subscribed to

the Google

Post by Dr. Wolfgang Kabatzke
Groups "N8VEM" group.
To unsubscribe from this group and stop receiving emails from

it, send

Post by Dr. Wolfgang Kabatzke
To post to this group, send email to

Post by Dr. Wolfgang Kabatzke
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Post by J. Alexander Jacocks
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.
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J. Alexander Jacocks

2013-12-28 04:18:13 UTC

Also, P9 is jumpered.

Thanks!

John Coffman

2013-12-28 16:07:35 UTC

Post by J. Alexander Jacocks
Also, P9 is jumpered.

check I also power my CF cards from the IDE interface.

--John

John Coffman

2013-12-28 16:05:38 UTC

Post by J. Alexander Jacocks
John,
I believe that I have the jumpers set on the board properly for the
P1: 1-2

N8VEM legacy check

Post by J. Alexander Jacocks
P2: no jumper

check this is not an option jumper, but a connector for
an external reset switch

Post by J. Alexander Jacocks
P4: 3-4, 11-12 (FCI SD card adapter)

FCI uses that odd CD2 pin check

Post by J. Alexander Jacocks
P10: 5-6

off, off, on, off check for board I/O select at 0xD?
-- this is currently what we are using

Post by J. Alexander Jacocks
P11: 2-3
P12: 2-3

Flash ROM setting check

Post by J. Alexander Jacocks
I couldn't find a full reference to the values for P1 and P2, but took
them from the picture of your board. I also can't see any bad joints
from U25 pin 18. I also switched to the 18 MHz crystal, so that I
could use a bit rate of 19200 bps.

P1 is for future Kontron ECB bus compatibility. 1-2 is the setting for
N8VEM, going back to a wrong guess as to the use of the C31 pin on the
96-pin DIN connector. This setting becomes important when there are
additional boards on the backplane. All newer boards, both CPU and I/O,
have this N8VEM/Kontron jumper. Old ones do not.

--John

Post by J. Alexander Jacocks
Thanks!
- Alex
Alex,
You at least should be seeing garbage on the terminal screen from
mis-matched baud rates. Using a 12.288Mhz oscillator, the test program
pre-scales the clock/2 by a factor of 30 before dividing by 16.
12288000/2 /30 /16 --> 12800
The SDcard LED is not lit until just before the 'halt'
instruction. You
are not getting that far.
Wayne had an issue with the /RESET signal not clearing U31 (ROM.sch).
If this 74LS174 does not reset to 00000, you will not be able to read
the ROM at boot time. This is the first place to look for a bad trace,
bad solder joint, and the like. The /RESET signal comes from U25.18
(LS240, pin 18).
Also, are the P11 and P12 jumpers set correctly for FLASH memory
(2-3)
or EPROM (1-2)?
Keep me posted.
--John

lights, and

Post by J. Alexander Jacocks
the central LED never switches to red, indicating a halted CPU.
Where do you suggest that I test? I have a logic probe and

multimeter

Post by J. Alexander Jacocks
handy.
Thanks!
- Alex
On Fri, Dec 27, 2013 at 11:22 AM, John Coffman
Alex,
Wayne and I are at the stage that two sets of s/w need to merge.
How we
will do that will play out over the next couple of days.
I, too, have a 33Mhz Z180 -- the "advanced S-class processor" -- in the
words of Setup. For the moment, run at one of the "magic"

frequencies

Post by J. Alexander Jacocks
6.144
9.216
12.288
18.432
At reset, the CPU comes up running at 1/2 osc. It may be

shifted

Post by J. Alexander Jacocks
to 1x
osc. if it is an SL1960 processor or higher. If it is the

"advanced"

Post by J. Alexander Jacocks
processor, it may be shifted to 2x osc.
However, RAM and ROM speeds actually determine how fast one

can run.

Post by J. Alexander Jacocks
Wait states will play a role at the higher speeds. You may

safely use

Post by J. Alexander Jacocks
the 12Mhz and 18Mhz oscillators for board testing.
Later today I will post a demonstration "setup" program on

the Wiki.

Post by J. Alexander Jacocks
===========
Reading your later e-mail: That "TEST1.HEX" requires a 9.216Mhz
oscillator, and communicates at 9600bps. You got it right,

the CPU is

reg.

Post by J. Alexander Jacocks
and a
new SSS=2 value. That should set you up (at 1/2osc) for

9600bps.

Post by J. Alexander Jacocks
--John
[BTW: SDCC 3.3.0 is to be avoided. Use 3.0.0, known to be

good.]

Post by J. Alexander Jacocks
John,
I have completed my basic build of the board. If I'm

using a 33 MHz

Post by J. Alexander Jacocks
Z8S180, I should use a 12.288 MHz oscillator, I'd assume,

to yield a

Post by J. Alexander Jacocks
~24.5 MHz operating frequency. To test, I'd assume that P3

takes the

Post by J. Alexander Jacocks
standard N8VEM cable, at 12800 bps, based on the testing

page? I

Post by J. Alexander Jacocks
noticed that the 12.288 MHz frequency isn't listed. That

frequency

Post by J. Alexander Jacocks
will be hard to match. I also bought an 18.432 MHz

crystal, but I'd

Post by J. Alexander Jacocks
suspect that my 33 MHz Z180 will probably not over clock

to ~36 MHz.

Post by J. Alexander Jacocks
Are there any other ways to change the speed of the serial

interface?

very useful,

Post by J. Alexander Jacocks
especially with that "enable" input. For I/O device

selection, I

Post by J. Alexander Jacocks
prefer
to use the LS682 because the "Qx" inputs have internal 20K

pull-up

Post by J. Alexander Jacocks
resistors. This removes the need for a pull-up resistor

pack, which,

Post by J. Alexander Jacocks
saves board space.
On the SBC Mark IV, you will also note the use of MAX233,

instead

Post by J. Alexander Jacocks
of the
more common MAX232. Again, this is a space-saving

choice to

Post by J. Alexander Jacocks
remove the
need for external support components.
--John

Post by Dr. Wolfgang Kabatzke
Hi John,
the PCB didn´t arrived me yet....
I studied the design and I have an idea for the next

version of

Post by J. Alexander Jacocks
Mark IV.

Post by Dr. Wolfgang Kabatzke
What do You think about changing U28 from 74LS682 to

74LS688

Post by J. Alexander Jacocks
(DL8121D,

Post by Dr. Wolfgang Kabatzke
AMZ8121, 74HC688))? I use this IC often because I have

problems to

Post by Dr. Wolfgang Kabatzke
order 74ls682. And: the /IORQ You may connect direct as

Gate-Input to

Post by Dr. Wolfgang Kabatzke
74LS688. You can then delete U19C and U19D...
I think this works.
Best regards
Wolfgang
Am Dienstag, 10. Dezember 2013 04:53:40 UTC+1

schrieb John

Post by Dr. Wolfgang Kabatzke
To All,
The first boards for the Z180 based SBC Mark IV

<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based
<http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>>

Post by Dr. Wolfgang Kabatzke
arrived late Monday. Shakedown of these boards

commences as

Post by J. Alexander Jacocks
of now.

Post by Dr. Wolfgang Kabatzke
With the high integration of the Z180, many

functions

Post by J. Alexander Jacocks
are moved

Post by Dr. Wolfgang Kabatzke
onto the
CPU chip. This allows interfaces for CF cards

and an

Post by J. Alexander Jacocks
SD card to

Post by Dr. Wolfgang Kabatzke
be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already

spoken

Post by J. Alexander Jacocks
for.

Post by Dr. Wolfgang Kabatzke
The Z180 SBC Mark IV's are 4-layer boards, 100mm x

160mm, same

Post by Dr. Wolfgang Kabatzke
size as
other N8VEM ECB boards. Because of the 4-layer

design, they

Post by J. Alexander Jacocks
cost $25

Post by Dr. Wolfgang Kabatzke
plus shipping: $3 in the U.S., $10 internationally.

Delivery

Post by Dr. Wolfgang Kabatzke
insurance
is at the buyer's option. Paypal to the e-mail

address in this

Post by Dr. Wolfgang Kabatzke
posting
is the preferred form of payment.
--John Coffman
--
You received this message because you are subscribed to

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Wayne Warthen

2013-12-29 04:26:41 UTC

Wanted to quickly pass along a bit of wisdom that just helped me stabilize
startup on my Mark IV. I had used ALS logic on most of the board except
for the bus logic. After seeing that my RESET signal was flaky, John
pointed out that LS logic is required for U25 because hysteresis is needed.
ALS logic does not have hysteresis. I changed my 74ALS240 to a 74LS240
and now startup is 100% reliable.

Not sure what chip family you have used Alex, but if you used ALS for U25,
you definitely want to switch to LS logic.

--Wayne

John Coffman

2013-12-29 19:05:01 UTC

Wayne,

I am glad that the "impossible-to-live-with" problem which you had, has
such a simple solution. My board has been built entirely with LS logic.

I have pushed the Z180 to 32Mhz (16Mhz oscillator, and clock multiplier
of 2x) at _zero_ wait states. I thought one wait state would be
required at that speed, but I am very pleasantly surprised. I am using
55ns SRAM with 70ns ROM.

--John

Post by Wayne Warthen
Wanted to quickly pass along a bit of wisdom that just helped me
stabilize startup on my Mark IV. I had used ALS logic on most of the
board except for the bus logic. After seeing that my RESET signal was
flaky, John pointed out that LS logic is required for U25
because hysteresis is needed. ALS logic does not have hysteresis. I
changed my 74ALS240 to a 74LS240 and now startup is 100% reliable.
Not sure what chip family you have used Alex, but if you used ALS for
U25, you definitely want to switch to LS logic.
--Wayne

Wayne Warthen

2013-12-29 22:11:27 UTC

I did not have a 16MHz oscillator handy, so I tried using the speed doubled
mode with my 18.432MHz oscillator. Using TEST3, it is working perfectly at
36.864MHz with zero wait states!

"Confirming Clock speed PHI = 36871 (36149)"

Like John, I am using 55ns SRAM and 70ns ROM.

--Wayne

I have pushed the Z180 to 32Mhz (16Mhz oscillator, and clock multiplier of
2x) at *zero* wait states. I thought one wait state would be required at
that speed, but I am very pleasantly surprised. I am using 55ns SRAM with
70ns ROM.
--John

Wayne Warthen

2013-12-31 05:07:19 UTC

A quick progress update on my end...

I have a preliminary adaptation of RomWBW now working on the Mark IV
including SD Card and IDE CF Card interfaces. The SD Card support does
require the board mod John has posted. The board is very stable at this
point.

I am routinely running at 36MHz with 1 memory wait state and 2 I/O wait
states. Some CF cards have trouble at this speed. I suspect it is
possible to improve the IDE driver to be reliable with more CF cards at
these speeds. The driver has never been asked to operate at these speeds
before.

As time permits, I am going to start integrating John's code into the HBIOS
portion of RomWBW.

--Wayne

Jörg Schöning

2013-12-30 13:32:55 UTC

Hi John,

the board has come on the 27th of December. Today I have tested the board
for the first time and runs perfectly.
Oscillator 18,432MHz, 55ns SRAM, 100ns EPROM

Console serial port 0 speed at next boot? [38400]:
Date read: Mon 12/30/2013
Date [mm/dd/yyyy]:
Time read: 14:22:51
Time [hh:mm[:ss]]:
Do detailed system setup? [N/y]: y
Trickle charge backup is Disabled.
Diode (0,1,2) & Resistor (2,4,8) [d[+r]]:
CPU clock multiplier of 0..2 (0 means 1/2)? [2]: 2
Memory wait states (0..3)? [0]: 0
Input/Output wait states (1..4)? [1]: 1
If changing Crystal Oscillator frequency, be sure to do an ICE COLD boot.
ICE COLD startup at 9600 baud on next boot? [N/y]: N
The DS1302 non-volatile RAM has been updated.
ß

Gettysburg Address

Four score and seven years ago our fathers brought forth on this
continent, a new nation, conceived in Liberty, and dedicated to
the proposition that all men are created equal.

Now we are engaged in a great civil war, testing whether that
nation, or any nation so conceived and so dedicated, can long
endure. We are met on a great battle-field of that war. We have
come to dedicate a portion of that field, as a final resting place
for those who here gave their lives that that nation might live. It
is altogether fitting and proper that we should do this.

But, in a larger sense, we can not dedicate -- we can not
consecrate -- we can not hallow -- this ground. The brave men,
living and dead, who struggled here, have consecrated it, far above
our poor power to add or detract. The world will little note, nor
long remember what we say here, but it can never forget what they
did here. It is for us the living, rather, to be dedicated here to
the unfinished work which they who fought here have thus far so
nobly advanced. It is rather for us to be here dedicated to the
great task remaining before us -- that from these honored dead we
take increased devotion to that cause for which they gave the last
full measure of devotion -- that we here highly resolve that these
dead shall not have died in vain -- that this nation, under God,
shall have a new birth of freedom -- and that government of the
people, by the people, for the people, shall not perish from the
earth.

Abraham Lincoln
November 19, 1863

Confirming Clock speed PHI = 36862 (36140)

Goodbye! ...

Thanks for the fantastic board, John!

Best regards,
Joerg
(Luebeck, Germany)

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV
<
http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman

Lars Nelson

2014-01-01 00:41:29 UTC

Hope there are some boards left. I'll be sending $28 via PayPal if there
are.

Lars Nelson

Post by John Coffman
To All,
The first boards for the Z180 based SBC Mark IV
<
http://n8vem-sbc.pbworks.com/w/page/70934729/ECB%20SCB%20Mark%20IV%20--%20Z180%20based>
arrived late Monday. Shakedown of these boards commences as of now.
With the high integration of the Z180, many functions are moved onto the
CPU chip. This allows interfaces for CF cards and an SD card to be on
the board. Truly a "Single Board Computer."
I have ten of these boards that are not already spoken for.
The Z180 SBC Mark IV's are 4-layer boards, 100mm x 160mm, same size as
other N8VEM ECB boards. Because of the 4-layer design, they cost $25
plus shipping: $3 in the U.S., $10 internationally. Delivery insurance
is at the buyer's option. Paypal to the e-mail address in this posting
is the preferred form of payment.
--John Coffman

Jörg Schöning

2014-01-01 12:41:59 UTC