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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: Miked on June 28, 2006, 12:57:47 AM
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I was surfing around the internet the other day and happened upon a link where a guy stated that his friend was able to hack a PP&S 500/040 board and add 16mb of memory instead of the usual 8mb (unfortunately I forgot to save the link..now I can't find it again)
Now I know the PP&S is a mythical creature but how would this hack be possible?
-Miked
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It cuold be possible if the RAM controller chip has unused row/col select pins. I believe this does happen to be true, and here's why.
I purchased one of these boards from a collegel roommate's brother, who removed the memory chips to use in an A3000 or something like that. The desoldering process did some PCB damage which had to be dealt with. On testing the new memory I got from somewhere in the sockets I installed to teh PCB, things did not work well, and turns out one of the RAM controller chip pins was toast. We found a datasheet for the chip, and were ableto connect teh PCB to an unused address pin, and did "something else" which I have no memory of now, and magically things worked again.
You'd just need to get that unused pin hooked up to the second bank of 8MB somehow. There's surely a little more to it than that, maybe mix it with the chip enable/select pin to alternate the chip enables from one bank to the other.