[Coco] CoCo 1 64K upgrade failed :(.
lamune at doki-doki.net
Fri Sep 26 14:50:25 EDT 2008
Phill Harvey-Smith wrote:
> Mike Pepe wrote:
>> Phill Harvey-Smith wrote:
>>> Did you check the voltage pins with a meter before plugging in the
>>> 64K rams, IIRC 4116s (which would be in for the 16K), use +5V, +12V,
>>> and -5V
>>> applying the +12/-5 to the 4164s will almost cirtainly fry them
>>> (managed to do this by mistake once, and the magic smoke definatly
>>> exscaped :( ).
>> I'm reasonably certain that the 4116's are +5V only. I know for sure
>> the 4K RAMs also needed -5 & +12V
> Nope, not acording to the data sheets I have and :-
> That's IIRc what some of the jumpers do, re-route the voltages.
That's good to know. I'll be careful if I do the upgrade then. I
remember seeing some home-upgraded D boards that bent the pins out of
the sockets and had them connected via flying leads- probably because
the jumpers weren't appropriate for 4164's at all.
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