sdyer@bbncca.ARPA (Steve Dyer) (01/15/84)
I haven't been able to use /t1 with my H19 terminal faster than 300 baud without garbaging input and/or output. Any clues? -- /Steve Dyer decvax!bbncca!sdyer sdyer@bbncca
riber@uicsl.UUCP (01/17/84)
#R:bbncca:-47800:uicsl:21600007:000:513 uicsl!riber Jan 16 10:48:00 1984 I can use 600 baud on my DEC terminal, but mostly suffer your same problem. The problem seems to be getting the coco to poll the rs232 line properly. I can print to my terminal at 2400 baud most of the time - it just won't send. It would be nice to work 9600 baud, but I think the soft rs232 port will just have to go if you want any realistic speed. Has anyone done anything with RS's new rs232 plug on??? Does it work? Is there a driver available for it? Rick Berry pur-ee!uiucdcs!uicsl!riber
danm@mspiggy (Dan McCabe) (01/18/84)
It has been suggested at one of the meetings of a Motorola User's Group which I attend that you can run at 9600 baud by using the fourth line (the others are Signal Ground, Transmit Data, and Receive Data) to interrupt the processor when data is received. Radio Shack calls this line their Carrier Detect line, which is normally generated by modems when the carrier is detected (makes sense). However, this line is connected to one of the interruptable inputs of one of the PIA's in the CoCo. With proper signal conditioning (convert RS-232 levels to TTL), the Recieve Data line could be connected to this line and interrupt the processor when the start bit is recieved. Of course, this means that you will need to write a new RS232 module, as well as design some hardware (however minimal). Happy hacking, Dan McCabe decvax!microsoft!danm Disclaimer: I haven't tried this method, so try it at your own risk. However, it does sound like a reasonable technique; if it wasn't, I wouldn't have suggested it.