Path: utzoo!yunexus!gen1!peter
From: peter@gen1.UUCP (Peter CAMILLERI)
Newsgroups: comp.sys.nsc.32k
Subject: Interrupts and the CMOS 32K
Keywords: Interrupts 32C016 32202
Message-ID: <322@gen1.UUCP>
Date: 30 Dec 87 03:21:37 GMT
Article-I.D.: gen1.322
Posted: Tue Dec 29 22:21:37 1987
Reply-To: peter@gen1.UUCP (Peter CAMILLERI)
Organization: gen1 - York University, Petrie Bldg, Downsview, Ontario CANADA
Lines: 26


    I would first like to thank all those who helped me obtain data on
CMOS versions of the 32k. I've submitted my proposal and it seems that
with a little urging on, I should be be able to avoid having to use an
8008 derived cpu in this project. ( and hopefully future ones too ).

    However a few points have come up.

What are the timings for the various sorts of interrupts?
      NMI ?   Non Vectored ?  Vectored ? Cascaded ?
I can't seem to be able to locate these stastics.

Secondly, while the cpu and tcu parts are great, the icu leaves a great deal
to be desired. Its slow and draws a lot of current. I have therefore decided
to build my own icu using a cmos pal and 2 HC jelly bean chips, in 
conjunction with peripherals that generate thier own vector. The question I
have is, What prevents me from using a RTT instruction instead of an RTI
instruction? My icu design has no internal state that nedds to be reset, and
niether do the Z85xx periperals I am using.

As always, any help would be most apreciated.


-- 
Peter  Camilleri         UUCP:       ...!mnetor!yunexus!gen1!peter
                                       ...utzoo!/