dg@lakart.UUCP (David Goodenough) (02/03/89)
I've just been landed with a project to write some software that communicates with the modem and printer ports on a PC. I'm going to be using MS C V5.1, but I have no real idea how to go about writing / reading / testing the state of the ports. I need the following: 1. Check if the modem port has a character to read 2. Get that character 3. Write a character to the modem port 4. Write a character to the printer port Also, if there is any code that needs to be executed to initiate the modem port to run at 9600 (or possibly 19200) BPS, and 8N1, I'd want to know about that too. In addition I'd like to be able to "hook" into some form of system clock tick, to execute a subroutine every 1/100th of a second or so. The exact frequency is not important, but at least once every 1/10th of a second would be desireable. I know the PC has a system clock, but I don't have a clue how to get at it. Please E-mail any answers, I don't usually get to read this group. Thanks in advance, -- dg@pallio.UUCP - David Goodenough +---+ IHS | +-+-+ ....... !harvard!xait!lakart!pallio!dg +-+-+ | AKA: dg%pallio.uucp@cfisun.cfi.com +---+
izumi@violet.berkeley.edu (Izumi Ohzawa) (02/05/89)
In article <411@lakart.UUCP> dg@lakart.UUCP (David Goodenough) writes: >I've just been landed with a project to write some software that communicates >with the modem and printer ports on a PC. I'm going to be using MS C V5.1, >but I have no real idea how to go about writing / reading / testing the >state of the ports. I need the following: > >1. Check if the modem port has a character to read >2. Get that character >3. Write a character to the modem port >4. Write a character to the printer port > >Also, if there is any code that needs to be executed to initiate the modem >port to run at 9600 (or possibly 19200) BPS, and 8N1, I'd want to know >about that too. > All of the above are supported by COMx port drivers which conform to FOSSIL driver specification. These drivers replace and extend BIOS INT14h. You should be able to get a copy of the driver from most BBS systems particularly those running OPUS BBS software. These BBS software itself heavily depend on the driver. And binaries are in public domain. Also, I saw a FOSSIL driver in WSMR-SIMTEL20 archive. Izumi Ohzawa izumi@violet.berkeley.edu ...ucbvax!violet!izumi
jbayer@ispi.UUCP (Jonathan Bayer) (02/07/89)
In article <411@lakart.UUCP> dg@lakart.UUCP (David Goodenough) writes: >I've just been landed with a project to write some software that communicates >with the modem and printer ports on a PC. I'm going to be using MS C V5.1, >but I have no real idea how to go about writing / reading / testing the >state of the ports. I need the following: > >1. Check if the modem port has a character to read >2. Get that character >3. Write a character to the modem port >4. Write a character to the printer port Look into the book: C Programmer's Guide to Serial Communications written by Joe Campbell published by Howard Sams and Co. JB -- Jonathan Bayer Beware: The light at the end of the Intelligent Software Products, Inc. tunnel may be an oncoming dragon 19 Virginia Ave. ...uunet!ispi!jbayer Rockville Centre, NY 11570 (516) 766-2867 jbayer@ispi