#: 10575 S10/OS9/6809 (CoCo)
    04-May-91  13:12:39
Sb: #CoCo1 problem
Fm: Mike Guzzi 76576,2715
To: all

I have a weird question. I have an old CoCo1 (F-board) and it runs fine except
with a disk controller. Rom paks work and basic works fine but plugging in a
known good controller causes it to show garbage on the screen and gives the
appearance that the controller is zapped! but taking the controller and
plugging it into another machine it works fine.

Any idea which chip in the CoCo could be bad? (has to be the machine) I can't
locate my old service manuals for the CoCo1.

The controllers used for the test was a FD502 controller, Sardis, and a hard
drive specilist. none work in the CoCo1 but all work in other machines just
fine.

Mike

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