[Coco] RS-232 pak problems
james at skwirl.ca
Thu May 20 17:04:52 EDT 2004
On 20-May-04, at 4:50 PM, Robert Gault wrote:
> Straighten the pin (if possible without breaking), reinsert the chip,
> and try again.
I had done that, but it didn't help any.
> Your version of the pak seems to be set for autostart. Mine does not
Yeah... however, it's autostarting to something that doesn't seem to be
working. Maybe someone rewrote the ROM to autostart... is it usually an
eeprom, or just a straight ROM? It looks to be the original Tandy one.
> If one ROM pin was not connecting, that could account for your
> problems. It does not necessarily mean the ROM is fried.
Well, it should be connecting fine now. But no improvement. Pressing
Break gives me nothing... it just sits at the screen.
> Please not that most Coco users don't make use of the ROM. I long ago
> removed the ROM and used either an OS-9 program or Ultimaterm as they
> were much better than the ROM program.
Oh, I agree, but it serves as a useful test to see if the thing's
working. Before resoldering the clock trace, I had tried to access the
6551 using the addresses, but I wasn't getting appropriate values (it
was in a multipak slot that wasn't the primary one). I'm guessing the
values in the manual should be correct, but I was getting 112 from the
So, given that, any other suggestions?
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