[Coco] Model No. 26-3127B motherboard

[Bruce W. Calkins]

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"

> Alan:
>
> 1: That's a 64K memory expansion card.
>
> 2: a pair of 16kx4 chips (41416 or similar) are what go in the now empty
> sockets
>
> 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
>>
>> Folks,
>> 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.
>>
>> Alan
>>
>> --
>> N8WQ - Canal Winchester, Ohio
>> http://exwn8jef.googlepages.com/home
>>
>>
>>
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>
>
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