Posted By
Hans
on 2012-09-05
03:26:47
|  Re: c16 doesnt work but screen isn't black
Hi,
crock wrote:
Judging by the pattern on the screen, I think the most likely culprits are a partially failed RAM chip at position U6 or the address line multiplexer at U8. Unfortunately this will mean desoldering the old chip as neither is usually socketed.
I don't have many spare C16 ram chips but if you want to tackle this yourself, there is usually plenty on ebay (search for "TMS-4416"). The mux (74LS257) is also easily available.
@chudson: If you have, by any chance, an Atari 600 in reach, you could get the chips from that machine. On the Atari board, all chips are socketed, thus no need to fire up the iron for desoldering.
Regards,
Hans.
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