Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!tut.cis.ohio-state.edu!cs.utexas.edu!ico!vail!dougm
From: dougm@ico.ISC.COM (Doug McCallum)
Newsgroups: comp.protocols.tcp-ip.ibmpc
Subject: Re: Interrupt vectors for PC Ethernet cards
Message-ID: <15853@vail.ICO.ISC.COM>
Date: 13 Jun 89 03:43:56 GMT
References: <782@omen.UUCP> <8906121543.AA25731@vax.ftp.com>
Reply-To: dougm@ico.ISC.COM (Doug McCallum,violet,114,)
Organization: Interactive Systems Corp., Boulder CO
Lines: 10

In article <8906121543.AA25731@vax.ftp.com> jbvb@VAX.FTP.COM (James Van Bokkelen) writes:
>The only AT-bus cards that hack interrupts greater than 7 are the 3Com
>3C505 and the other "16-bit AT-bus" cards (Gateway, IMC and Tiara that
>I know of, maybe others).  3Com's PCS/TCP, our PC/TCP and NRC Fusion

While most don't support the signals for the second PIC, IRQ 2 (the IRQ the
second PIC is chained off of) can be used and will give an interrupt in
the upper range.  This gets back an IRQ that people tend to think is missing
on an AT.  A lot of the 8-bit boards do support IRQ 2.  This helped some
of our 386/ix customers who thought they were out of IRQs.