#: 7998 S12/OS9/68000 (OSK)
    04-Nov-90  22:16:03
Sb: #Atari ST RS232 info
Fm: BILL HEALTON 73367,357
To: Kevin Darling 76703,4227 (X)

Kevin- saw your activity on the Atari ST RS232 problems (STSIO), and had some
info I thought I'd pass on. From discussion(s) with Bill Brady about a year ago
I recall mention of a problem(feature) he had heard of with the 68901 from
Motorola. As I recall there was a addendum to the spec sheets that said you had
to clear the data registers after changing the setup(or some such thing). You
might want to give him a shout. Other info- the 68901 has (4) interrupt vectors
dedicated to the USART $9-xmit error, $A-Xmit Empty, $B-Rcv error, and $C-Rcv
Full. Also Atari uses (3) GPIP ports for CTS,DCD, and ring. The driver STSIO
uses Xmit Empty and Rcv Full and disables xmit error. Haven't looked deep, but
it appears to rely on ROM routines for XON/XOFF and ???? Hope this is of some
help.

ps. any luck with def files for the (tiny) effort.

Bill Healton










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