[Coco] Caring for a CoCo

[Bruce W. Calkins]

Thanks Mark,

I have a Performance Peripherals memory upgrade board that blew the 6809 on 
a CoCo 3.  I'll check the pins.   FWIW; I pulled the chip and put in a 
socket, which will hold a 1 meg interface, a protector and eventualy a 6309.

Bruce W.

==============================


----- Original Message ----- 
From: "Mark Marlette"

> Jim,
>
> Might want to check to see how long the interface leads of the 512k are.
>
> I have seen ones that are too long and allow the 512k board to bottom out 
> on the motherboard, cause shorts.
>
> There are traces that run under the CoCo's 512k expansion connectors and 
> the connectors DO NOT have a physical bottom or stop to them. Dumb, cheap, 
> what ever you want to call it.
>
> I suspecting that your homemade version is a wire wrapped model or is it a 
> PWB board? Depending on signal routing and crosstalk of other w/w wires, 
> this will cause this erratic operation to occur.
>
> Mark
> Cloud-9
>
>
> ----- Original Message -----
> From: "Jim Hathaway"
>
> Thanks for providing some more details around possible failure points.  I
> have been dealing with issues from my two CoCo 3 systems in the past year 
> or
> so.  The first issue was the complete failure of a 512k memory board. 
> This
> one drove me crazy and I spent lots of time replacing all the memory 
> chips,
> replacing caps on the board and also trying to re-flow the solder
> connections on the board.  All of these steps did not help, and so in the
> end there is something else that has caused this board to fail.  This 
> board
> was manufactured by Performance Peripherals.
>
> Jim