Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!mnetor!uunet!seismo!rutgers!mtune!codas!novavax!utx1!davis From: davis@utx1.UUCP (Gary A. Davis) Newsgroups: comp.sys.m6809 Subject: Re: RS-232 port: hardware or software? Message-ID: <1213@utx1.UUCP> Date: Wed, 22-Jul-87 08:44:21 EDT Article-I.D.: utx1.1213 Posted: Wed Jul 22 08:44:21 1987 Date-Received: Sat, 25-Jul-87 06:33:47 EDT References: <500@otto.COM> Organization: Racal-Milgo, Ft. Lauderdale, Fl. Lines: 29 in article <500@otto.COM>, rex@otto.COM (Rex Jolliff) says: > Posted: Sat Jul 18 08:34:07 1987 > > > I was thinking of buying a coco (2 or 3) and I was wondering if the rs-232 > port is all hardware or if any of it is implemented in software. > > Rex. The coco comes with a serial port with 4 pins (send, rcv, gnd, status). It is implemented in software by waiting for ready, transmitting a bit and then delaying based on a pokeable variable and finally back to waiting for ready. I have no problem transmitting (to a printer) at 9600 with this port. Modem communications which is bidirectional is limited to 300 with many terminal emulators but some can hack 1200. Optionally, a hardware port is available (I think it has been discontinued, but they are still around) called a Deluxe RS232 Pack. It plugs into the rom port or one of the (optional) multi-pak ports. I think this allows upto 19.2k. Many people get both the multi-pak and the RS232 pack and plug the modem into it leaving the serial port for the printer. Gary -- Gary A. Davis Racal-Milgo, P.O. Box 407044, Fort Lauderdale, Fl 33340, (305) 476-4393 ihnp4!allegra!novavax!utx1!davis