Mongo
Well-known member
I am working on a Williams Time Fantasy. The CPU reported error 5 (IC 20 bad). So I cleaned the ROM, pulled the boards and re-soldered all of the headers, and I still get the same thing.
I pulled the chip which was a 2532. I erased it and re-burned it. After burning I got a bad checksum. So I did it again and got the SAME bad checksum. I did a little digging and there shouldn't be a 2532 in that slot. There should be a 2716. I burned a fresh 2716 and got a good checksum.
Now... the 2532 was the original chip and not a re-pro. I am inclined to put the 2532 back in there under the assumption that somewhere, sometime, someone converted the board to use a 2532 in that spot. Of course to do that you would need to mod the POST code to accept the incorrect checksum which I am assuming was already done. If so, the 2716 won't work there anymore.
Any opinions on what I should do in this case?
I pulled the chip which was a 2532. I erased it and re-burned it. After burning I got a bad checksum. So I did it again and got the SAME bad checksum. I did a little digging and there shouldn't be a 2532 in that slot. There should be a 2716. I burned a fresh 2716 and got a good checksum.
Now... the 2532 was the original chip and not a re-pro. I am inclined to put the 2532 back in there under the assumption that somewhere, sometime, someone converted the board to use a 2532 in that spot. Of course to do that you would need to mod the POST code to accept the incorrect checksum which I am assuming was already done. If so, the 2716 won't work there anymore.
Any opinions on what I should do in this case?