Posted By
TLC
on 2011-08-25
11:30:18
|  Re: Another plus 4 problem
Just as Csabo said: it's very likely a ram problem. If this is a Plus/4 (not a C16, not a C116), then one of your ram chips (one of the 4164 drams building up that nice 4x2 block of chips at the bottom/right corner of the mainboard) might have gone to the moon. Judging from Csabo's observation: the ram chip that holds bit #2 should be at fault, which is (in this case) U13. ( http://zimmers.net/anonftp/pub/cbm/schematics/computers/plus4/plus4-310164-3of4.gif )
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