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The loss of the serial output suggests that some signal on the
backplane is corrupted by the CVDU board. The jumper settings I
suggested earlier disconnect all "INT" signals, so this should not
be an issue. As you know, there should be no change in SBC v2
behavior w/ or w/out the CVDU.<br>
<br>
In running the test programs, I would suggest using a RomWBW image
without the CVDU; just use straight serial output. The test program
should be the only s/w addressing the CVDU. The wr/rd of the
registers does not depend on any monitor. <br>
<br>
--John<br>
<br>
<br>
<br>
<br>
On 04/13/2013 04:10 AM, J. Alexander Jacocks wrote:
<blockquote
cite="mid:CAF-r0Y1=vXJav7kR58c7NcfmmpNcd8v9m7EhMS_hzQP7_aARZw-JsoAwUIsXosN+***@public.gmane.org"
type="cite">
<div dir="ltr"><span style="color: rgb(0, 0, 0); font-family:
arial,sans-serif; font-size: 13px;">John,</span><br
style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<br style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">Currently, I am connecting to a Dell 19"
Trinitron monitor, via VGA. That</span><br style="color:
rgb(0, 0, 0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">monitor is capable of doing quite a few
different sync frequencies, but I'm</span><br style="color:
rgb(0, 0, 0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">not completely sure where it's lower bounds
are. I'll check on that.</span><br style="color: rgb(0, 0,
0); font-family: arial,sans-serif; font-size: 13px;">
<br style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">I also have a Commodore 1080 monitor, which
supports digital RGB, so it</span><br style="color: rgb(0, 0,
0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">should be a good fallback, if the Dell won't
scan low enough.</span><br style="color: rgb(0, 0, 0);
font-family: arial,sans-serif; font-size: 13px;">
<br style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">I have loaded Dan's test programs onto the
ROM disk, in my custom RomWBW</span><br style="color: rgb(0,
0, 0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">config. However, since the machine does not
seem to POST (no output on</span><br style="color: rgb(0, 0,
0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">serial console) when the ColorVDU is
installed, I haven't been able to test</span><br style="color:
rgb(0, 0, 0); font-family: arial,sans-serif; font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">much, yet.</span>
<div><br>
</div>
<div>And Wayne, I'll try changing the config for the RAM size,
but I'm not too hopeful that's the issue, since the machine
should POST, no matter the ROM config, when I load the
N8VEM_SBC standard ROM, which has no support for Color VDU,
right?<br style="color: rgb(0, 0, 0); font-family:
arial,sans-serif; font-size: 13px;">
<br style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family:
arial,sans-serif; font-size: 13px;">Thanks!</span><br
style="color: rgb(0, 0, 0); font-family: arial,sans-serif;
font-size: 13px;">
<span style="color: rgb(0, 0, 0); font-family:
arial,sans-serif; font-size: 13px;">- Alex</span><br>
</div>
</div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Fri, Apr 12, 2013 at 8:00 PM, John
Coffman <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:johninsd-***@public.gmane.org" target="_blank">johninsd-***@public.gmane.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> Long term, I'd like
to be able to test the DRAM size on the CVDU to know what
can and cannot be supported. 64K chips will definitely be
needed to use the device in monochrome graphics mode;
likewise, to support multiple character pages as on an
IBM-PC. But for a single page of text, 16K is definitely
sufficient: IF ... if the setup is for 16K, not 64K.<br>
<br>
No matter the 16K/64K initialization setting, you should
see video output, even if it is garbage. The first time I
got garbage on the screen in bringing the board up I was
happy to know I was on the right track.<br>
<br>
Q1: What kind of monitor are you using, and how are you
connecting? A strictly VGA monitor will not sync to the
slower output of this old chip. The SBC-188 setup uses
exact EGA timing with a 16.257Mhz oscillator (see my board
pix on the Wiki), so a "multisync" type of monitor must be
used with the VGA connector. Dan originally connected
with a CGA to VGA external board, and must have used quite
different timing parameters. Unfortunately, the 8563 is
too old and slow to operate at the higher VGA frequencies.<br>
<br>
Q2: Are you working with Dan's "M8563 Test Programs.zip"
yet? They are on the Wiki on the second page of the CVDU
postings. One level to get to is to be able to read &
write registers/memory on the 8563, and print out the
correct values.<span class="HOEnZb"><font color="#888888"><br>
<br>
--John</font></span>
<div>
<div class="h5"><br>
<br>
<br>
<br>
<br>
<br>
On 04/12/2013 10:42 AM, J. Alexander Jacocks wrote:
<blockquote type="cite">
<div dir="ltr">
<div>
<div>John,<br>
<br>
</div>
I am using <font><span>TMS4416-12 ICs, so they
are 16K DRAMs. Should I change them out?
The BoM wasn't specific, so I wasn't aware
that the extra capacity was used. I'd be
happy to do some testing, for you, if you
want.<br>
<br>
Thanks!<br>
</span></font></div>
<font><span>- Alex</span></font></div>
<div class="gmail_extra"><br>
<br>
<div class="gmail_quote">On Fri, Apr 12, 2013 at
12:13 PM, John Coffman <span dir="ltr"><<a
moz-do-not-send="true"
href="mailto:johninsd-***@public.gmane.org"
target="_blank">johninsd-***@public.gmane.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:
0pt 0pt 0pt 0.8ex; border-left: 1px solid
rgb(204, 204, 204); padding-left: 1ex;">
<div bgcolor="#ffffff" text="#000000"> Alex,<br>
<br>
Are you using 16K DRAM chips or 64K chips?
The SBC-188 BIOS was written using 64K
chips; I have been unable to test with 16K
chips (at a reasonable price).<br>
<br>
Wayne would have to comment on whether this
might affect SBC v2 operation. There is a
bit in the initialization parameters which
tells the 8563 what size chips are in use.
I know the '188 says "64K."<br>
<br>
#1 priority: get those board mods into the
circuit [ConstructionNotes.txt].<span><font
color="#888888"><br>
<br>
--John</font></span>
<div>
<div><br>
<br>
<br>
<br>
<br>
On 04/11/2013 11:11 PM, Wayne Warthen
wrote:
<blockquote type="cite">Hi Alex,
<div><br>
</div>
<div>You will need to apply all of the
documented patches even when using
the board with an N8VEM SBCv2.</div>
<div><br>
</div>
<div>-Wayne<br>
<br>
On Thursday, April 11, 2013 8:49:41
PM UTC-7, Alexander wrote:
<blockquote class="gmail_quote"
style="margin: 0pt 0pt 0pt 0.8ex;
border-left: 1px solid rgb(204,
204, 204); padding-left: 1ex;">
<div dir="ltr">
<div>OK, I think I have the
board set correctly. However,
whenever I install it to the
ECB backplane, I don't get any
output, anymore, from the
serial console on the N8VEM
SBC V2 board. I do get a
keyboard LED flash, at power
on, if I connect a PS/2
keyboard. I take that to be a
good sign that the keyboard
controller is at least
initializing.<br>
</div>
<div><br>
</div>
<div>I have tried installing the
ColorVDU ROM, and also the
standard ROM, with the
ColorVDU test programs added.
Neither seems to help things.</div>
<div><br>
</div>
<div>I have checked my
soldering, and I don't see any
obvious shorts or missing
connectivity.</div>
<div><br>
</div>
<div>I did not perform any of
the fixups that are listed in
the Construction Notes, as I
was not planning to use the
board with a SBC-188 board.
Are there any that I should
particularly do?</div>
<div><br>
</div>
<div>Thanks!</div>
<div>- Alex<br>
<br>
<div class="gmail_quote">On
Thu, Apr 11, 2013 at 4:28
AM, John Coffman <span
dir="ltr"><<a
moz-do-not-send="true">john...-***@public.gmane.org</a>></span>
wrote:<br>
<blockquote
class="gmail_quote"
style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px
solid rgb(204, 204, 204);
padding-left: 1ex;">
<div bgcolor="#ffffff"
text="#000000"> P5
selects the high nibble
of the device code;
0xE? is suggested; i.e.,
jumper 7-8 only.<br>
<br>
K1, K2, K3 select
interrupts. AFAIK, none
are used. No jumpers.<br>
<br>
K4, K5 select H, V sync
polarity; 1-2 is pos.,
2-3 is neg.<br>
This may take some
experimentation to get
right for your monitor.
Start with both 1-2.<br>
<br>
JP1 must be in place.<br>
<br>
P32 is an external
connector. Leave all
pins open.<br>
<br>
<br>
--John
<div>
<div><br>
<br>
<br>
<br>
<br>
On 04/10/2013 09:23
PM, J. Alexander
Jacocks wrote: </div>
</div>
<blockquote type="cite">
<div>
<div>
<div dir="ltr">All,
<div><br>
</div>
<div>I must be
completely
blind, but I
can't find the
jumper
reference for
the Color VDU
board. I know
JP1 needs to
be set, but
I'm not at all
sure about
others.</div>
<div> <br>
</div>
<div>Help?</div>
<div><br>
</div>
<div>Thanks!</div>
<div>- Alex</div>
</div>
</div>
</div>
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