Marvin wrote:
>
> In rummage through the dark recesses of my garage (too densly packed to let
> in light) I again ran across an IBM AT motherboard that used the piggyback
> memory chips. Were there any other computers that used these things? Also,
> does anyone know the numbers of the two chips that were soldered together?
Well, before the official version came out, lots of TRS-80 Color
Computers were upgraded from 16k to 32k via piggybacking, since
4164 RAMS were so much more expensive than doubled-up 4116's. Note
that this was _not_ supported by Tandy Corporation, but the first
one I saw was done in the repair shop of the Radio Shack Computer
Center where I was teaching at the time. I seem to recall that a
few Sinclairs were upgraded similarly, though it made it hard to get
the case back together.
--
Ward Griffiths <mailto:gram_at_cnct.com> <http://www.cnct.com/home/gram/>
When I was crossing the border into Canada, they asked me if I had any
firearms with me. I said "Well, what do you need?" -- Steven Wright
Received on Mon Oct 19 1998 - 16:07:57 BST