[Coco] 26-3127B <-> 26-3134B Coco 2Bs

[Kip Koon]

Al,
Do you have a schematic of this, or at least the pin out designations?

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon



-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Al Hartman
Sent: Saturday, December 13, 2014 11:13 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] 26-3127B <-> 26-3134B Coco 2Bs

No, it only upgrades the Coco 2 to 64k. You must remove the existing RAM to install this.

https://www.flickr.com/photos/alhartman/15826138289/

-[ Al ]-

-----Original Message-----
From: Kip Koon
Sent: Saturday, December 13, 2014 10:32 AM
To: 'CoCoList for Color Computer Enthusiasts'
Subject: Re: [Coco] 26-3127B  26-3134B Coco 2Bs

Bruce,
I would like to see those 64KB upgrade memory boards!  Does that make the Coco 2 128KB by any chance?

Kip Koon
computerdoc at sc.rr.com
http://www.cocopedia.com/wiki/index.php/Kip_Koon



-----Original Message-----
From: Coco [mailto:coco-bounces at maltedmedia.com] On Behalf Of Bruce W. 
Calkins
Sent: Saturday, December 13, 2014 9:14 AM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] 26-3127B <-> 26-3134B Coco 2Bs


----- Original Message -----
From: "Kip Koon"

> Hi Coco 2B Hardware Gurus!
>
> This may be old news to some of you so those of you who don't know, I 
> have recently (within the last few days) discovered that the memory 
> area of the 26-3134B Coco 2B which I have looks Identical to the 
> memory area of the 26-2127B Coco 2B except for the following differences.
>
> I have yet to check my 26-3134B motherboard yet, but if I remember 
> correctly, my memory is implemented with two 4464 chips and has a two
> 12 pin female headers, one near each chip.  Whereas MarKO's 26-3127B's 
> memory is implemented with 8 - 4164s.  Where he has memory, my 
> motherboard is blank and where I have memory, his motherboard is 
> blank!  Other than that difference, are these two Coco 2B motherboards 
> identical?  Is the same motherboard being used for both model numbers 
> of Coco 2Bs?  They both were made in Korea, so this seems possible.
> If that is the case, then Why?
> Memory chip supply problems?  Why two catalog numbers?  Inquiring 
> minds want to know!  Scooby-Doo, Where are you ?
>
> Kip Koon
>
===========================

This is covered on page 77 of the book "Tandy's Little Wonder" by F. G.
Swygert with one minor exception.  I have in stock 2 of the somewhat rare plug-in 64k upgrade boards.
Bruce W.


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