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Article #210945Re: Most complex instructions (was Re: IBM 9020 FAA/ATC Systems from 1960's)
From: CBFalconer
Date: Sat, 18 Aug 2001 17:09
Date: Sat, 18 Aug 2001 17:09
24 lines
2789 bytes
2789 bytes
Frank McConnell wrote: > > 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!) Shades of MPE and SPL. Does HP still maintain those machines? -- Chuck F (cbfal...@yahoo.com) (cbfal...@XXXXworldnet.att.net) (Remove "XXXX" from reply address. yahoo works unmodified) mailto:u...@ftc.gov (for spambots to harvest)
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Path: mbox-mo1.pugleaf.net!archiver1.google.com!newsfeed.google.com!newsfeed.stanford.edu!news-spur1.maxwell.syr.edu!news.maxwell.syr.edu!news.stealth.net!204.127.161.2.MISMATCH!wn2feed!worldnet.att.net!135.173.83.71!wnfilter1!worldnet-localpost!bgtnsc05-news.ops.worldnet.att.net.POSTED!not-for-mail Message-ID: <3B7E6560.F5F6DE9F@yahoo.com> From: CBFalconer <cbfal...@yahoo.com> Reply-To: cbfal...@worldnet.att.net Organization: Ched Research X-Mailer: Mozilla 4.75 [en] (Win98; U) X-Accept-Language: en MIME-Version: 1.0 Newsgroups: alt.folklore.computers Subject: Re: Most complex instructions (was Re: IBM 9020 FAA/ATC Systems from 1960's) 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$e%3.8225465@news2-win.server.ntlworld.com> <slrn9no27d.psh.rsteiner@isis.visi.com> <3B7C2B74.3E3D9FA4@yahoo.com> <9lkppq$jvf$1@daemonweed.reanimators.org> Lines: 26 Date: Sat, 18 Aug 2001 17:09:06 GMT NNTP-Posting-Host: 12.90.169.240 X-Complaints-To: ab...@worldnet.att.net X-Trace: bgtnsc05-news.ops.worldnet.att.net 998154546 12.90.169.240 (Sat, 18 Aug 2001 17:09:06 GMT) NNTP-Posting-Date: Sat, 18 Aug 2001 17:09:06 GMT Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit