[N8VEM: 19094] SBC Mk4 Alive

Discussion:

RichLeary

2014-12-13 19:10:17 UTC

I completed assembly of my SBC Mk 4 earlier this week. Testing has gone
quite well and the board has been operated both on the UNA BIOS (V1.00.17)
and RomWBW 2.6.5.

I am having a problem with the ROM drive under UNA and John Coffman has
been very helpful in pointing me to areas to examine.

Bottom line is that this is a great board - a "keeper" in a message I sent
John and the ROM drive is an issue to work through but not a show stopper.

Performance using the on board SD card interface is fantastic. I finally
have a system that can allow me to shut down my 30+ year old S100 - ST506
system for Z80/CP/M projects and dedicate it to 65C02 projects.

Well done John!

Rich Leary

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RichLeary

2014-12-21 05:38:47 UTC

Permalink

Great news - my SBC MK IV is working like a champ. The problem I was having
has been fixed in UNA 1.01.20. Root cause was failure to change file
directory records to reflect use of 8 or 16 bit block numbers,

Rich Leary

John Coffman

2014-12-21 07:55:59 UTC

Permalink

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On 12/20/2014 09:38 PM, RichLeary wrote:
<blockquote
cite="mid:181767f0-cf0c-454b-8fe6-***@googlegroups.com"
type="cite">
<div dir="ltr">
<div>Great news - my SBC MK IV is working like a champ. The
problem I was having has been fixed in UNA 1.01.20. Root cause
was failure to change file directory records to reflect use of
8 or 16 bit block numbers,</div>
<div><br>
</div>
</div>
</blockquote>
And I must thank Rich for his help in tracking down what turned out
to be a software problem:  no one else has ever used a 1Mb EPROM on
the Mark IV, so no one else had ever hit the problem.  This bug was
a subtle one to track down.<br>
<br>
--John<br>
<br>
<br>
<br>
<blockquote
cite="mid:181767f0-cf0c-454b-8fe6-***@googlegroups.com"
type="cite">
<div dir="ltr">
<div>Rich Leary</div>
</div>
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