[Coco] CoCo 1 64K upgrade failed :(.

[Phill Harvey-Smith]

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 :-

http://www.cbmhardware.de/mosic/ram4108.php

That's IIRc what some of the jumpers do, re-route the voltages.

Cheers.

Phill.

-- 
Phill Harvey-Smith, Programmer, Hardware hacker, and general eccentric !

"You can twist perceptions, but reality won't budge" -- Rush.