[Coco] Newly acquired 26-3026 (CoCo 2 ECB, 16k?)

[Daniel Campos]

Em 19/10/2013 16:46, Chad H escreveu:
> Well I just got this poor neglected soul off ebay for $0.01 (well not
> really, there was shipping J )  Anywhooo, the seller thought it was broken
> but I figured what the heck, they probably just didn't know enough about it
> to figure out how to work it.
>
>   
>
> I plugged it up and it fired up nice and pretty.  PRINT MEM showed
> 24871..huh?  Looked like someone upgraded the RAM since I thought these had
> 16KB from factory.  Underneath I saw a replaced service seal: "Radio Shack
> Service Center".   I figure they upgraded it.  Well I was going to break the
> seal anyways, since the case looks dirty and yellowed, and I found the
> inside board was dusty too, so took a brush to that.  Funny, the board looks
> identical to my 36-3127 unit, except the RAM is already socketed whereas I
> had to go and socket the 26-3217.  Also, there are 2 caps on the left (power
> section) that are actually mounted underneath the board, which I don't think
> my 26-3127 had.   As for the RAM, It has the Motorola emblem but I don't
> recognize the chips and I can't even find the 64k jumper on this board.
> This is a odd one :/
>
>   
>
> Here are some pictures I took..
> http://www.mediafire.com/folder/4fzk73i24xo77/TRS-80_CoCo     Go to "Board
> images" and see "26-3026"
>
>   
>
> I did want to test the CPU (HALT, etc) so I did a couple of DSKINI's with
> FD-502 and physical floppy drive, all went perfectly.  Also I booted
> DeskMate (OS-9) since I knew that required 64K to run and it worked fine.
>
>   
>
> Looks like I rescued another perfectly working CoCo that was just neglected
> and needed a home.    I'm going to store it for the time being, unless
> someone is interested in it?
>
>

Nice!

I just serviced a CoCo2 with the same board as yours a while ago for a 
friend and it also had the capacitors underneath. The problem was a bad 
RAM chip. Bellow you can see the machine and it was pretty yellowed also.

https://picasaweb.google.com/109345699838454178536/CoCo2DoJuan#

Daniel