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Author Topic: A590 memory problem after trying to mod  (Read 2383 times)

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Offline alexh

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Re: A590 memory problem after trying to mod
« on: December 29, 2010, 09:56:00 AM »
You've probably melted the PCB somewhere. Go over it with a magnifying glass both sides looking for a burnt track.

Perhaps you put a RAM chip in backwards and inadvertently connected +5v and GND?
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Offline alexh

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Re: A590 memory problem after trying to mod
« Reply #1 on: December 30, 2010, 09:24:09 AM »
That is the correct RAM, 256K(bit)x4 (128Kbytes each) @ 80ns (120ns minimum required) so 16 chips should have given you 2Mbytes. I think all 256Kx4 PDIP DRAM chips have the same pinout.

Should have been fine. Did you check each one to make sure they didn't send you a rogue one?
« Last Edit: December 30, 2010, 09:26:43 AM by alexh »
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