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From: adrie@philica.ica.philips.nl (Adrie Koolen)
Newsgroups: comp.os.minix
Subject: Re: Dumb Questions -- IBM Minix
Message-ID: <720@philica.ica.philips.nl>
Date: 7 Dec 90 14:43:52 GMT
References: <6113@crash.cts.com>
Reply-To: adrie@beitel.ica.philips.nl (Adrie Koolen)
Organization: Philips TDS, Innovation Centre Aachen
Lines: 20

In article <6113@crash.cts.com> jca@pnet01.cts.com (John C. Archambeau) writes:
>Not really.  You could set up the RS-232 driver to follow the COM1-COM4
>conventions of the PS/2.  They are as follows:
>
>          Base
>Name     Address    IRQ
>-----------------------
>COM1      0x3f8      4
>COM2      0x2f8      3
>COM3      0x3e8      5
>COM4      0x2e8      2

The IBM PS/2 Model 60 I worked with, had two standard RS232 channels. The first
one used IRQ 4, the second one IRQ 3. I had an extra micro-channel card with
one RS232 channel. It also used IRQ 3 (interrupt sharing is standard on the
micro-channel as it uses level sensitive interrupts). The documentation stated
that all additional IBM RS232 channels use IRQ 3.

Adrie Koolen (adrie@ica.philips.nl)
Philips Innovation Centre Aachen