Looks like the system board is useless now ... UNLESS:

1) I can locate an OBP & POST installation package for the board (P/N
501-4854)
2) I can get the bad OBP to break and give me an "ok" prompt
3) I can find some way to update the PROM via the serial port

If anyone can provide info for these tasks, I sure would appreciate it. (I'm
not really expecting much, though.)


Thanks to all those who responded to my previous plea for help (see thread
from 30 Jan).

Tom dot Taylor at unisys dot com

Tom Taylor wrote:
> Looks like the system board is useless now ... UNLESS:
>
> 1) I can locate an OBP & POST installation package for the board (P/N
> 501-4854)
> 2) I can get the bad OBP to break and give me an "ok" prompt
> 3) I can find some way to update the PROM via the serial port
>
> If anyone can provide info for these tasks, I sure would appreciate it. (I'm
> not really expecting much, though.)
>
>
> Thanks to all those who responded to my previous plea for help (see thread
> from 30 Jan).
>
> Tom dot Taylor at unisys dot com
>
>

I don't know whether that board actually uses a PROM (as opposed to,
e.g., flash memory) but if it does, and since you've got some other
similar boards, you might be able to use a PROM programmer to copy the
PROM out of one of the functional ones and get back to where you began.

Just a thought. It might not be worth the effort.

Tom Taylor wrote:
> Looks like the system board is useless now ... UNLESS:
>
> 1) I can locate an OBP & POST installation package for the board (P/N
> 501-4854)
> 2) I can get the bad OBP to break and give me an "ok" prompt
> 3) I can find some way to update the PROM via the serial port
>
> If anyone can provide info for these tasks, I sure would appreciate it. (I'm
> not really expecting much, though.)
>
>
> Thanks to all those who responded to my previous plea for help (see thread
> from 30 Jan).
>
> Tom dot Taylor at unisys dot com
>
>

Tom, how is the anchor? I haven't heard/seen much of late...? Sorry I
couldn't be of assistance - the last hex keypad I used was to punch
cards in about 1977 for COBOL batch - I skipped PROM programmers :-(

I have given up on repairing this system. I managed to locate another (old)
box to do the job.

Tom ;<(

Tom Taylor wrote:
> I have given up on repairing this system. I managed to locate another (old)
> box to do the job.
>
> Tom ;<(
>
>

So the anchor's up for grabs? I could take it off your hands if you like...

What's an Ultra 20?