Ira Baxter baxter at zola.ICS.UCI.EDU
Tue May 29 13:18:52 AEST 1990

I recently flamed the entire PC world, including UNIX OS porters, for
stupid interrupt system design; I now understand that the problem
seems to be active drivers on each I/O board for each interrupt level.

I want to at least apologize to the UNIX OS porters, for making the best
of a bad thing. :-{{{

The flame to the idiot hardware designers... well, *that* still stands.
And malarkey about how the PC wasn't designed for big systems is no d---
excuse (comments about how it wasn't designed at all, well, now, those
make sense!).

Given all that... has anybody made the ISC 2.0.2 X5 ASY update operate
with more than one device on the same interrupt level?  The docs
explicitly say that some serial ports really do allow multiple devices
on the same level.  How can this possibly work?  What do serial ports
do differently on the bus to allow a logical or of interrupts?  I have
tried configuring in ths driver with a standard dual serial (COM1: and
COM2: for MSDOS) with an internal modem (COM4:), hacking ASY_2_VECT to
be level 3, but apparantly the output interrupts get mangled, and
stuff comes out at the rate of 1 ch/second.  Obviously... some weird
interrupt conflict.

(714) 856-6693  ICS Dept/ UC Irvine, Irvine CA 92717

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