[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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