Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!rochester!bbn!gatech!paj From: paj@gatech.UUCP Newsgroups: comp.sys.ibm.pc Subject: Interrupt's for the COM ports on a PS/2 model 50 Message-ID: <16803@gatech.edu> Date: Thu, 3-Dec-87 11:28:51 EST Article-I.D.: gatech.16803 Posted: Thu Dec 3 11:28:51 1987 Date-Received: Sun, 6-Dec-87 17:15:52 EST Organization: School of Information and Computer Science, Georgia Tech, Atlanta Lines: 35 Keywords: interrupts,serial,com,port,pia I have a terminal emulator package that I have written that is interrupt driven from the serial port and it does not work on the PS/2 model 50 system (DOS 3.3) that I just got. The program sets up the 8259 to enable interrupts from the serial port. The 8259 used to use IRQ4 for the serial port interrupt - has this or the address of the 8259 port changed ? Is there an 8259 port in the PS/2 Mod 50 system ? Can anyone give me any suggestions as to what may be causing me a problem or direct me to documentation which describes the interrupts for the PS/2 model 50 system and how to enable them for the serial (com) port ? Also, I am not using BIOS to read/write the serial port since I need to be able to do things like send a BREAK and ignore RTS/CTS interaction. The way this was done was to map the BIOS data segment into my program and get the RS_232 base address from the BIOS data area. Has the offset to the RS_232 base address in the BIOS data area changed ? Once again - Is there a manual that describes what I need to know for the PS/2 model 50 system ? Thanks, P. Allen Jensen -- P. Allen Jensen GTICES Systems Laboratory, Civil Engineering, Georgia Tech, Atlanta GA 30332 CSNet: paj @ GATech ARPA: paj%GATech.CSNet @ CSNet-Relay.ARPA uucp: ...!{akgua,allegra,amd,hplabs,ihnp4,seismo,ut-ngp}!gatech!paj