Path: utzoo!utgpu!water!watmath!clyde!cbosgd!ucbvax!E.ISI.EDU!SAC.HQSAC-DOCT From: SAC.HQSAC-DOCT@E.ISI.EDU ("John A. Wright") Newsgroups: comp.os.cpm Subject: CP/M Devices Message-ID:Date: 16 Dec 87 02:34:00 GMT Sender: daemon@ucbvax.BERKELEY.EDU Distribution: world Organization: The ARPA Internet Lines: 47 I am somewhat confused. I have downloaded two terminal pgms for my Osborn I that are supposed to run off the serial port. Neither does. In my reading, I have come across the explanation of the "STAT" command which allows me to assign any physical device to a logical device. My problem is that I can't figure out form the book exactly what that means. According to the Ref manuel I have the following logical devices: CON: >> Keyboard + screen RDR: >> serial/parallel/ieee (Can anyone tell me what a "reader" is) PUN: >> " " " (Can anyone tell me what a "punch" is) LST: >> " " " I have the following physical devices: TTY: CRT: BAT: UC1: PTR: UR1: UR2: PTP: UP1: UP2: LPT: UL1: Does anyone have a simple explanation for all this, or even a not so simple one would be a help. From what I have found, the RS-232 (Serial) port and the 9 pin (modem) port have about the same functions. Book says "the modem and RS-232 interfaces are basically one and the same; the primary difference is that many of the signal levels on the RS-232 connector are help constant, while you can manipulate them using the modem connector." It goes on further to say: "If all you need to do is read to and from the modem/or serial port, simply change the IO BYTE indirectly by using the CP/M STAT command..." Seems to me I should be able to run a standard modem off the RS-232 port if I can change the IO BYTE. Any ideas? Thanks in advance.