[Coco] Model No. 26-3127B motherboard
devries.bob at gmail.com
Sat Mar 7 16:39:57 EST 2009
Interesting comment regarding 64K daughter boards.
Here in Australia, all the 26-3127 cocos had the daughter board as supplied
by Tandy. Any 16K coco2 was most often upgraded with the daughter board if
done by Tandy in-house, or with 2 64k x 4 bit chips (41464 or similar) if
done by third party hardware people or users.
I know I upgraded a dozen of them in that manner at one stage for a Tandy
store in exchange for a 128k Coco3 (my first Coco3).
Also, the 41464 chips from the upgraded Coco3 could be used to upgrade the
Regards, Bob Devries, Dalby, Queensland, Australia
Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.
my blog: http://bdevries.invigorated.org/
----- Original Message -----
From: "Bruce W. Calkins" <brucewcalkins at charter.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, March 08, 2009 6:03 AM
Subject: Re: [Coco] Model No. 26-3127B motherboard
> Mike has it concisely correct. It does appear that the 64K expansion
> cards are not all that common. I have seen two in the dozens of CoCos
> that I have opened up. But there are people who have opened up as many or
> more than I and not seen one. The sockets for the 16kx4 chips will also
> take the 64kx4 chips that we pull from our CoCo 3s for the 512k expansion.
> These might use a little less power to run that the expansion card.
> Bruce W.
> ----- Original Message -----
> From: "Mike Pepe"
>> 1: That's a 64K memory expansion card.
>> 2: a pair of 16kx4 chips (41416 or similar) are what go in the now empty
>> 3: the 64k/128k jumpers refer to the ROM size. 64 kilobit (8k x 8) for
>> standard color basic, 128 kilobit (16k x 8) for extended basic
>>> -----Original Message-----
>>> From: On Behalf Of N8WQ
>>> Today I took apart a 26-3127B for the first time.
>>> I have a couple of questions that need answered.
>>> If you have time go to http://exwn8jef.googlepages.com/cocoprojects
>>> and see if you can help me out.
>>> Also does anyone have a scanned copy of 26-3127B service manual?
>>> Thanks and have a great day.
>>> N8WQ - Canal Winchester, Ohio
>>> Coco mailing list
>>> Coco at maltedmedia.com
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