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

[Chad H]

Excellent!  Good job there :)  I just had to pull the Cassette relay off of
this one to check why it wouldn't remote control the motor (it stayed off
always).  Fortunately I was able to clean the internal contact on the relay
latch, re-soldered it and voila!

-----Original Message-----
From: coco-bounces at maltedmedia.com [mailto:coco-bounces at maltedmedia.com] On
Behalf Of Daniel Campos
Sent: Saturday, October 19, 2013 9:18 PM
To: CoCoList for Color Computer Enthusiasts
Subject: Re: [Coco] Newly acquired 26-3026 (CoCo 2 ECB, 16k?)

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

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