[Coco] Model No. 26-3127B motherboard
Bruce W. Calkins
brucewcalkins at charter.net
Sat Mar 7 15:03:55 EST 2009
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.
----- 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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