#: 17535 S10/OS9/6809 (CoCo)
    16-Feb-93  13:47:06
Sb: 4in1 6551 blues?
Fm: Sandy Tipper 72060,76
To: all

I have a DISTO SCII with 4-in-1, and I cannot seem to get the serial port to
work.  I have ACIAPAK.DR and have it patched as specified, using /t2 as the
descriptor. I also used to use Wizpro, soI have PROACIA.DR and the descriptor
/mwp. Both descriptors are set for the right address $07FF54, and name their
respectively appropriate drivers. With /mwp, I can write to the modem, but
cannot receive.  With a loopback connector and using a 'scope, with 'xcom9
/mwp' I see data xmitted, but no characters echo, although DTR is fed back to
DSR and CD.

With /t2 and the "correct" driver, the transmit line is dead. (scope shows
constant -ve voltage).

Is there something wrong with my software or understanding, or is my 6551
toasted?  I don't want to risk hacking at the 4-in-1 board to replace it if its
not a hardware problem.

Urgently required to get my system useful again.

Sandy