[rescue] Wanted: 8-bit ISA CGA or EGA card

Paxton innfosun at gmail.com
Fri Jan 2 18:53:25 CST 2015

The offset image is something I have seen before. I don't think it is a bad
card. I think it is an indication of monitor problems or incompatibility.
Is it the standard IBM CGA monitor?

I seem to remember tweaking pots inside a monitor to get the monitor to
sync correctly. However I think that I was dealing with mono monitors on an
XT. It has been a long time.

I don't think it is your cards.


On Fri, Jan 2, 2015 at 9:34 AM, Barry Callahan <barryc at rjlsystems.com>

> The RAM countup doesn't mean the BIOS thinks the RAM is good. Just that it
> thinks it's there.
> On 1/2/2015 11:31 AM, Steve Hatle wrote:
>> Just a follow-up on this. I sourced a known good (and identical) CGA
>> card, and
>> the machine behaves exactly the same way, even with all other
>> cards out of the
>> system.
>> Time, I guess, to start swapping around rows of RAM on the
>> motherboard
>> and see if I can isolate a fault there, but the machine does pass
>> the
>> RAM countup, and the jailbar/checkerboard display appears before that
>> happens.
>> I guess if they always worked, it wouldn't be as much fun :-)
>> Happy New Year all,
>> Steve
>> -------- Original Message --------
>> Subject:
>> [rescue] Wanted: 8-bit ISA CGA or EGA card
>> From: "Steve Hatle"
>> Date: Tue,
>> December 16, 2014 9:17 am
>> To: rescue at sunhelp.org
>> All,
>> I got a freebie IBM XT
>> (5160) that appears to have a bad CGA card in it.
>> ...
>> Symptoms on the "bad"
>> card are that at power-on it puts up a "jail-bar"
>> like pattern with some
>> reverse flashing characters in it, and then will
>> start to display the memory
>> count and banner, but these are offset -
>> best way to describe it is like the
>> left "edge" of the screen is in the
>> middle of the physical display. So - the
>> banner text starts in the
>> middle
>> of the screen, and then wraps around to the
>> left.
>> _______________________________________________
>> rescue list - http://www.sunhelp.org/mailman/listinfo/rescue
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Paxton Hoag
Astoria, OR

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