Most complex instructions (was Re: IBM 9020 FAA/ATC Systems from 1960's)

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#210944

From: Frank McConnell
Date: Sat, 18 Aug 2001 04:09

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CBFalconer <cbfal...@yahoo.com> wrote:
> I believe the HP3000 circa 1980 had a 'schedule' instruction
> micro-programmed.  This could be used to voluntarily relinquish
> the CPU, or by the op-sys on the appropriate timer interrupt.

DISP, and its disable/enable pair PSDB and PSEB.  All privileged
instructions, not intended for user code, although I have read and
written privileged non-system code use PSDB/PSEB to stall the
dispatcher.  DISP effectively causes an interrupt (either when the
DISP instruction is executed, or when a later PSEB returns the
pseudo-disable count to 0), and that gets the actual MPE dispatcher
code involved.

(Present tense: some of us still have runnable and/or running classic
3000s!)

-Frank McConnell

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<7HU77.9333$TM5.980906@typhoon.southeast.rr.com> <memo.20010727094436.36989A@mikekingston.compulink.co.uk> <vd2NzVOTNb7v-pn2-vdi55dTSr5Cy@dialup-63.208.164.65.Dial1.Washington2.Level3.net> <jwU87.26231$J37.6143999@typhoon.southeast.rr.com> <vd2NzVOTNb7v-pn2-S9FIPi2udxUW@dialup-63.208.164.94.Dial1.Washington2.Level3.net> <9k3oan$t35$1@top.mitre.org> <vd2NzVOTNb7v-pn2-kRuq3Z30rY3O@dialup-209.244.87.87.Dial1.Washington2.Level3.net> <vd2NzVOTNb7v-pn2-PBomleKh1jJS@dialup-209.244.224.188.Dial1.Washin <9l0m6j$la3$1@top.mitre.org> <K2Tc7.108947$TM5.16755795@typhoon.southeast.rr.com> <6aie7.52269$e%3.8225465@news2-win.server.ntlworld.com> <slrn9no27d.psh.rsteiner@isis.visi.com> <3B7C2B74.3E3D9FA4@yahoo.com>

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Path: mbox-mo1.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news.kjsl.com!news.reanimators.org!not-for-mail
From: Frank McConnell <f...@reanimators.org>
Newsgroups: alt.folklore.computers
Subject: Most complex instructions (was Re: IBM 9020 FAA/ATC Systems from 1960's)
Date: 17 Aug 2001 21:09:30 -0700
Organization: Reanimators
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References: <7HU77.9333$TM5.980906@typhoon.southeast.rr.com> <memo.20010727094436.36989A@mikekingston.compulink.co.uk> <vd2NzVOTNb7v-pn2-vdi55dTSr5Cy@dialup-63.208.164.65.Dial1.Washington2.Level3.net> <jwU87.26231$J37.6143999@typhoon.southeast.rr.com> <vd2NzVOTNb7v-pn2-S9FIPi2udxUW@dialup-63.208.164.94.Dial1.Washington2.Level3.net> <9k3oan$t35$1@top.mitre.org> <vd2NzVOTNb7v-pn2-kRuq3Z30rY3O@dialup-209.244.87.87.Dial1.Washington2.Level3.net> <vd2NzVOTNb7v-pn2-PBomleKh1jJS@dialup-209.244.224.188.Dial1.Washin <9l0m6j$la3$1@top.mitre.org> <K2Tc7.108947$TM5.16755795@typhoon.southeast.rr.com> <6aie7.52269$e%3.8225465@news2-win.server.ntlworld.com> <slrn9no27d.psh.rsteiner@isis.visi.com> <3B7C2B74.3E3D9FA4@yahoo.com>
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