[Coco] Upgrade 16k Coco2 (26-3136A) to 64k using Coco3 leftover RAMchips?

[Bob Devries]

David,

I upgraded a number of Coco2 (korean type, short case) to 64K by using the 
chips from Coco3 computers which were upgraded to 512K, and inserting that 
one jumper. If you're careful not to melt the.plastic/aluminium foil shield 
underneath, you can even do it "in-situ".

Regards, Bob Devries
Dalby, QLD, Australia

----- Original Message ----- 
From: "David Roper" <ebonhand09 at gmail.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Wednesday, October 31, 2012 6:20 PM
Subject: [Coco] Upgrade 16k Coco2 (26-3136A) to 64k using Coco3 leftover 
RAMchips?


> Hi All,
>
> Just wondering if it's possible to use the 4x MT4067-12 chips that just
> came off my replacement Coco3 motherboard (after upgrading the Coco3 to
> 512k) to upgrade my 16k Coco2 to 64k?
>
> My Coco2 has two socketed MB81416-12 chips in IC10 and IC11, and I can see
> the "RAM 64K" jumper pads ready for soldering
>
> But, I know almost nothing about this process, and google isn't throwing 
> me
> much light. The data sheets for all the chips involved aren't
> comprehensible by me at this point
>
> Any advice, either way?
>
> Kind regards,
> David
>
> --
> Coco mailing list
> Coco at maltedmedia.com
> http://five.pairlist.net/mailman/listinfo/coco