From: utzoo!decvax!cca!HUNEYCUTT@Wpafb-Afwal@sri-unix
Newsgroups: net.micro
Title: Vectored Ints..
Article-I.D.: sri-unix.3259
Posted: Mon Sep 13 21:59:46 1982
Received: Tue Sep 14 05:59:56 1982


Larry,

  The S-100 book you've seen talked about on this list lately (S Libes, etc)
has a pretty simple circuit to convert the vectored interrupt lines into
a one-of-seven RST instruction for the S-100.  The 8259 in this case is 
used in polled mode since most 8080/Z80 cards and support circuitry don't
provide the 3 sINTA pulses the 8259 wants to see if you use it in it's
vectored mode.  See page 225 of Libes' book for the circuit.

Good Luck,
Doug