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From: davidsen@steinmetz.steinmetz.UUCP (William E. Davidsen Jr)
Newsgroups: comp.sys.ibm.pc
Subject: Re: Interrupt's for the COM ports on a PS/2 model 50
Message-ID: <8139@steinmetz.steinmetz.UUCP>
Date: Tue, 8-Dec-87 21:35:16 EST
Article-I.D.: steinmet.8139
Posted: Tue Dec  8 21:35:16 1987
Date-Received: Sun, 13-Dec-87 17:29:48 EST
References: <16803@gatech.edu> <132@babbage.acc.virginia.edu>
Reply-To: davidsen@crdos1.UUCP (bill davidsen)
Organization: General Electric CRD, Schenectady, NY
Lines: 14
Keywords: interrupts,serial,com,port,pia

In article <132@babbage.acc.virginia.edu> mac3n@babbage.acc.virginia.edu (Alex Colvin) writes:

| 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.

I tried a number of communication programs, both internally written and
other, and they ran on the PS/2. There is a bit in the 8259 which
selects edge or level trigger, but it may be initialized diferently by
the BIOS software (you do initialize everything, right?) in the PS/2.
-- 
	bill davidsen		(wedu@ge-crd.arpa)
  {uunet | philabs | seismo}!steinmetz!crdos1!davidsen
"Stupidity, like virtue, is its own reward" -me