jwt@atari.UUcp (Jim Tittsler) (04/16/86)
Does anyone have a good subroutine for transmitting/receiving characters to/from the Model 100's serial port? I have a BASIC program that can not seem to handle high speed input (>~1200 baud) even with XON/XOFF enabled. What would be nice to have would be something that would have arbitrary sized transmit and receive buffers with flow control, and ideally the ability to return the number of characters or lines available/waiting to be sent. What I would actually like is a more powerful INPUT LINE command for the serial port. It would be nice to be able to do a read call and have it time out after a programmable number of mS without a character or line, and maybe include string pattern matching (similar to the "auto login" feature of TELCOM). Thanks for the help, Jim lll-crg!vecpyr!atari!jwt
moore@mit-eddie.UUCP (04/19/86)
You can use I$=INPUT$(1,1) [where MDM: or COM: is opened as file #1] to input characters one at a time. You can use this in conjunction with the status of PEEK(65414) which holds the number of bytes pending in the modem receive buffer. Don't know if this will solve the problem of losing characters (it probably won't) but it does give you a bit more control over the data coming in through the MDM: and/or COM: ports. Just for the record, a handy line to clear the modem input buffer (receive buffer) is 1000 IF PEEK(65414)>0 THEN I$=INPUT$(PEEK(65414),1) ...where MDM:/COM: is opened as file #1. This will clear the input buffer if there are any characters there. If no chars pending, it does nothing. -drew arpa: MOORE%MIT-EECS@MIT-MC.ARPA uucp: ...mit-eddie!moore us: Box 121, North Quincy, MA 02171