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Article #625598Re: PDP 11/40 system manual
From: Questor
Date: Thu, 16 Aug 2018 08:42
Date: Thu, 16 Aug 2018 08:42
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2402 bytes
On 14 Aug 2018 02:26:21 GMT, Charlie Gibbs <cgibbs@kltpzyxm.invalid> wrote: >On 2018-08-12, Dan Espen <dan1...@gmail.com> wrote: > >> I'm never clear on what happens when you exceed >> the limits of a hardware stack. > >That depends on whether the hardware has a stack limit register >and can trap the stack overflow. Otherwise, very bad things happen. A PDP-10 stack pointer has the stack address in the right halfword and the negative stack count in the left halfword. Every time something is pushed on the stack, one is added to each halfword. When the left halfword is zero, the stack is full. Detecting stack overflow is easy and done in hardware.
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X-Received: by 2002:adf:e6c3:: with SMTP id y3-v6mr2370799wrm.18.1534408927835; Thu, 16 Aug 2018 01:42:07 -0700 (PDT) X-BeenThere: alt.folklore.computers@googlegroups.com Received: by 2002:a7b:c08d:: with SMTP id r13-v6ls904287wmh.4.gmail; Thu, 16 Aug 2018 01:42:07 -0700 (PDT) X-Received: by 2002:a1c:9e42:: with SMTP id h63-v6mr2568099wme.10.1534408927253; Thu, 16 Aug 2018 01:42:07 -0700 (PDT) MIME-Version: 1.0 Path: mbox-mo1.pugleaf.net!p4-v6ni20629wmb.0!nntp.google.com!feeder1-2.proxad.net!proxad.net!feeder1-1.proxad.net!ecngs!feeder2.ecngs.de!87.79.20.101.MISMATCH!newsreader4.netcologne.de!news.netcologne.de!peer02.ams1!peer.ams1.xlned.com!news.xlned.com!peer02.am4!peer.am4.highwinds-media.com!peer02.iad!feed-me.highwinds-media.com!news.highwinds-media.com!post02.iad!fx12.iad.POSTED!not-for-mail From: usenet@only.tnx (Questor) Newsgroups: alt.folklore.computers Subject: Re: PDP 11/40 system manual Organization: random access Reply-To: usenet@only.tnx Message-ID: <5b7538e3.17044578@news.dslextreme.com> References: <21aaeee8-c41a-4442-a4eb-ea6a29b1e4f1@googlegroups.com> <0001HW.211B94B1040CADA5700004B5B2CF@news.giganews.com> <mdd7ekzl6pr.fsf@panix5.panix.com> <pki8ae$ca0$1@dont-email.me> <mddh8k2vyfh.fsf@panix5.panix.com> <pkmrkc$6lm$1@dont-email.me> <767649820.555764566.888777.peter_flass-yahoo.com@news.eternal-september.org> <pkpgkg$grv$1@dont-email.me> <pktekd028n8@news2.newsguy.com> X-Newsreader: Forte Free Agent 1.21/32.243 Lines: 14 X-Complaints-To: abu...@dslextreme.com NNTP-Posting-Date: Thu, 16 Aug 2018 08:42:06 UTC Date: Thu, 16 Aug 2018 08:42:33 GMT X-Received-Bytes: 1650 X-Received-Body-CRC: 543116181 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit