Hi John,
Thanks a bunch for sending me this picture. Thanks for the warnings about the proper processors to use on the Mark IV. I donât think Iâm building this version as I bought the PCBs a few months ago, but I do appreciate your efforts to help me. If you can think of anything else, I would welcome your help and advice. You are truly a digital electronics engineer guru! Iâm so glad you among others are on the N8VEM team. Thank you again.
Kip Koon
***@sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon
From: ***@googlegroups.com [mailto:***@googlegroups.com] On Behalf Of John Coffman
Sent: Tuesday, January 20, 2015 11:01 AM
To: ***@googlegroups.com
Subject: Re: [N8VEM: 19225] Where to start ?
Kip,
Here is an early photo of the first Mark IV -- note that the first processor it was tested with is the Z180 that you need to avoid: the brain-damaged "SL1960" rev. Zilog does not document that this chip lacks many of the features of the later Z8S180 chips. The UNA BIOS detects this chip and avoids its pitfalls.
The VSC and VEG suffixes on the part number are both okay: Z8S18033 chips (fastest) were not issued AFAIK in the SL1960 version.
BTW: the rev. 2 parts list contains the above caution about SL1960 processors.
--John
On 01/20/2015 12:33 AM, Kip Koon wrote:
Will,
Thanks a bunch for the BOM, I appreciate it. I need a copy of the pictures for your Mark IV again. I can't find the original email you sent them in and I need to check on some chips. Thanks a bunch.
Kip Koon
***@sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon
-----Original Message-----
From: ***@googlegroups.com [mailto:***@googlegroups.com] On Behalf Of William R Sowerbutts
Sent: Sunday, January 18, 2015 5:54 PM
To: ***@googlegroups.com
Subject: Re: [N8VEM: 19214] Where to start ?
Kip
Copies attached (same spreadsheet in a couple of different formats)
The Mark IV is a great board -- have fun!
Best wishes
Will
On Sun, Jan 18, 2015 at 03:43:36PM -0500, Kip Koon wrote:
Hi Will,
I'm beginning my ECB Mark IV SBC Build along with the N8 and the
Gryphon simultaneously and I noticed you have offered your list of
parts you used to build your Mark IV. I'd like to have a copy of that
list of parts from Farnell when you have a chance. Thanks a bunch. I appreciate it.
Kip Koon
***@sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon
-----Original Message-----
From: ***@googlegroups.com [mailto:***@googlegroups.com] On Behalf
Of William R Sowerbutts
Sent: Tuesday, May 13, 2014 6:52 AM
To: ***@googlegroups.com
Subject: Re: [N8VEM: 18066] Where to start ?
Hi Alan
Welcome to N8VEM.
I built one of John's Mark IV boards last week. It's a really excellent
board and highly integrated with everything you need to get up and running.
I have mine running at 36.864MHz.
I sourced all of my components from Farnell with a few exceptios:
- the 4Mbit flash ROM chip and the RS422 driver I sourced from Digikey
- 18.432MHz clock crystal sourced from RS Components.
I'm happy to share my list of Farnell order codes to save you having to
look them all up (took me a fair while to find all the right bits).
Best wishes
Will
On Mon, May 12, 2014 at 04:17:18PM -0700, Alan Cox wrote:
I'm trying to work out where to start in the actual hardware world (as
opposed to emulators and FPGA).
Now ultimately I'd rather like to end up with a dual Z80/M68K S100 box
running a mix of OS's including ucLinux on the 68000, but clearly
that's probably not the right place to begin as presumably I'd have to
build a backplane, cpu board, memory board and PSU and debug it all to
get
anywhere.
The ECB looks a better option as it's then presumably reasonable to
run it standalone and get it working before even thinking about
backplanes and the like. Does the SBC Mark IV have any facility for a
timer interrupt or would that be a task for an additional card ?
The other ones I was looking at was Grant Searle's Z80 CP/M on a
breadboard which looks like it might also be a fun way of getting up
and running as well as a bit more hackable from a 'learning by getting
it
wrong'
perspective (eg adding memory banking using the spare modem control
lines on the SIO).
Other question I had was whether anyone is building these in the UK
and if so who they are using for component supply - especially the odder bits.
Most of it appears available from Rapid but it would be nice to know
good places for the odder parts, and the CPUs etc.
Any advice ?
Alan
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