I suggest a little fun for everyone - let's try to list all the ICs that the IBM 5100/5110 cards are made of - I was able to determine that "those two white 28 pin ICs" are SIGNETICS N82S09I RAM 64x9 28-pin - it seems to be a static memory RAM
ps. why can't I edit an earlier added post?
Thank you so much!
I wonder if I could take a few more moments of your attention
The topic of datapoint machines is very intriguing, and apart from the company's official materials, I have not been able to find answers to several questions
It turned out that the replacement chips were also faulty, only the 4th 7402 installed made the memory expansion testing game work -
the problem is that the software on the 6809 - Waterloo side still does not work
It could be anything.
I have no idea where to look for the cause anymore.
I tried to run the memory test program on the expansion board today. It did not start up.
I tried to fire up a game (http://www.primrosebank.net/computers/pet/repairs/pet_repairs_ext_ram.htm) that I know is the only one...
Waterloo menu…
I have already landed programs via rs232 and from floppy disk. They never started up. I replaced all the ram on the memory expansion board and one 7402 chip with a broken leg. Still no change
Only PIP run.
Today it turned out that there are also problems on the 6502 side
A small update on the topic:
I already have zoomfloops, I managed to prepare a floppy disk with Waterloo programs based on the d80 image
It turns out that the programs load but don't run. Now there is no longer a strange error message but they still don't work.
I also found another faulty...