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

[David Roper]

Thanks, Bob - you inspired me to give it a go (even with my pathetic
soldering skills)

It appears to be working fine :)

- David


On 31 October 2012 19:33, Bob Devries <devries.bob at gmail.com> wrote:

> 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
>>
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