Date   : Sun, 17 Dec 1989 02:08:35 GMT
From   : crash!mwilson@nosc.mil (Marc Wilson)
Subject: Kaypro interrupts

     Is there anyone out there who has any experience with using interrupts
on a Kaypro?  I refer specifically to a Kaypro 4/84 ( 81-185 motherboard ).

     I've been fooling around with it for quite some time now, but can't get
a thing out of it.  I've replaced both the CPU and the offending SIO chip,
but still no interrupts.

     The computer works fine... so I know NMI's aren't being ignored ( both
the floppy and the HD controller use NMI's to indicate that they need
service ).

     Or did my adding the HD controller to the setup do something?  The mother-
board has the connector, just as it should.  I used all Kaypro parts, except
for the HD itself ( which was an old 10 Mb I had on the shelf ).

     The motherboard originally had the 292 ROM in it... I've replaced that
with the 302-C ROM in a 2764.

     The problem exists under all versions of CP/M that I've tried.  These
are F, G, and H.  It's running F right now.

     Is there something in the Kaypro design that precludes using the Z80
maskable interrupts?  The schematics for the boards don't indicate that...
They make it seem very straightforward.

     I've also tried the PD program's INTTERM and HMK2112.  Both should
operate in an interrupt mode.  Neither does.

     Help!

                                               -- Marc

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