Mac 512k

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Fri Feb 1 12:14:47 2002

On 1 Feb 2002, Brian Wheeler wrote:
> > > old solder on new chips over the old ones trick.
> Partly cloudy. My dad did the 32K->64K upgrade on the coco1, and it
> required the 2nd bank of 32K to be soldered on top of the 1st bank :)
> With some motherboard trace cuts thrown in for good measure.

Can you tell us the part number for a 32K RAM?
(Rhetorical question - TANSA)


The original Coc was 16K; getting THAT up to 32K could be done by
piggybacking, or by putting in 64K chips with some minor trace cutting and
jumpering.


Going from 32K to 64K requires reconfiguring the hardware to see the rest
of the RAM in the "32K" chip that was actually a 64K, and sometimes
required replacing the 16K (or double 16K) chips with 64K ones. Some
people reported running into some 64K chips that RS was using as 32K that
may have been defective and had to be replaced to access the full 64K.


I let Dr. Marty do the upgrade on my early Coco. He was always overjoyed
to have an audience when he worked.
He also hooked up the BNC for me for composite video.
Received on Fri Feb 01 2002 - 12:14:47 GMT