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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
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