Replica IBM 5150 PC motherboard

[Paul Anderson]

I have several boards labeled 5160 64/256K old style sys on the sealed
static bag and 1503334 on the board. Another has 50008?2 on the etch.

Any info would be useful. If you are interested in any of them please
contact me off list.

Thanks, Paul

On Sat, Mar 10, 2018 at 7:24 PM, Fred Cisin via cctalk <
cctalk at classiccmp.org> wrote:

> On Thu, 8 Mar 2018, Ali wrote:
>
>> Howzbout the Fischer? diagnostic ROM, thta came with a hard-wired
>>> configured serial port, that could perform some tests on a system that
>>> did NOT boot to the point of video.
>>>
>> Now that does sound interesting. Tell us more uncle Fred ;).
>>
>
> Not much to tell, and I don't know much.
> I think that it was Todd Fischer.
> He supplied a ROM, and a serial board that was hard configured for a
> terminal (can't run software to configure a serial card if the machine
> won't boot!).  It therefore did not rely on the video working.
> He also had been selling cases and power supplies for 5.25" drives at the
> conputer swaps.
>
>
> I really enjoyed the P.O.S.T. cards.  In debugging code, I could insert a
> simple output to a port of the value of a variable, with minimal disruption
> of any of the rest of the code.
>
>
> A friend pointed out that most diagnostic software, including many memory
> tests, etc. would not run if there actually WAS a fault, such as bad RAM in
> Bank0. So, as a joke, he wrote a "DIAGNOSTIC PROGRAM", that put "It works!"
> on the screen.  "If you get the message, then it means that everything is
> at least sorta working.  If you do not get the message, then something is
> wrong."  Later, he changed it to "friendlier message", and had it say,
> "Hello, world".
>