Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Path: utzoo!utgpu!water!watmath!clyde!rutgers!mcnc!uvaarpa!virginia!babbage!mac3n From: mac3n@babbage.UUCP Newsgroups: comp.sys.ibm.pc Subject: Re: Interrupt's for the COM ports on a PS/2 model 50 Message-ID: <132@babbage.acc.virginia.edu> Date: Fri, 4-Dec-87 16:16:57 EST Article-I.D.: babbage.132 Posted: Fri Dec 4 16:16:57 1987 Date-Received: Wed, 9-Dec-87 20:54:18 EST References: <16803@gatech.edu> Organization: University of Virginia Lines: 9 Keywords: interrupts,serial,com,port,pia Summary: 8259 PIC edge / level triggered In article <16803@gatech.edu>, paj@gatech.edu (P. Allen Jensen) writes: > port and it does not work on the PS/2 model 50 > > The program sets up the 8259 to enable > interrupts from the serial port. The 8259 used The 8259 triggers interrupts off the IRQ lines either by edge or by level. In the PC it's edge, making it hard to share IRQ lines. I believe this changed to level in the PS/2.