From: milov@cs.uwlax.edu (Milo Velimirovic)
Subject: [TUHS] Early non-Unix filesystems?
Date: Wed, 23 Mar 2016 19:43:56 -0500 [thread overview]
Message-ID: <B43B3EBC-1D97-4003-9002-6D57BBCF984D@cs.uwlax.edu> (raw)
In-Reply-To: <001601d18564$9f79d2c0$de6d7840$@ronnatalie.com>
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> On Mar 23, 2016, at 7:32 PM, Ron Natalie <ron at ronnatalie.com> wrote:
>
>
>> Closest I've ever been murdered was when I "accidentally" filled the local
>> 11/70 with an uninterruptible instruction sequence."
>
> SPL instruction. The PDP-11 was odd that while SPL was a "privileged"
> instruction, rather that trapping if you did it in user mode, it just
> "ignored" it.
> Well, what it ignored was the actual change of the processor level. What
> it still implemented was the side effect was that interrupts were locked out
> until the next instruction fetch.
> If you filled your instruction space up with SPLs you could lock up the
> computer so that even the HALT key didn't work (you had to do a bus RESET).
This is of course a fairly well known bug in the pdp11. I wonder if this was fixable with a hardware mod, like the “there’s this NAND gate here” sort of fix to the MTPx/MFPx instructions or if it required a change to the microcode, that presumably DEC wasn’t interested in.
> [snip]
next prev parent reply other threads:[~2016-03-24 0:43 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-03-18 0:48 Warren Toomey
2016-03-18 2:49 ` Greg 'groggy' Lehey
2016-03-18 3:59 ` John Cowan
2016-03-18 5:11 ` Warren Toomey
2016-03-18 17:45 ` John Cowan
2016-03-18 8:00 ` Dave Horsfall
2016-03-18 8:42 ` Peter Jeremy
2016-03-18 13:04 ` Clem Cole
2016-03-18 17:12 ` scj
2016-03-18 17:45 ` Random832
2016-03-18 18:02 ` scj
2016-03-21 14:11 ` Dave Horsfall
2016-03-21 21:43 ` Greg 'groggy' Lehey
2016-03-21 22:57 ` scj
2016-03-21 23:05 ` Lyndon Nerenberg
2016-03-22 0:27 ` Greg 'groggy' Lehey
2016-03-23 22:46 ` Dave Horsfall
2016-03-24 0:32 ` Ron Natalie
2016-03-24 0:43 ` Milo Velimirovic [this message]
2016-03-24 0:47 ` Ron Natalie
2016-03-24 1:05 ` Clem Cole
2016-03-23 1:28 ` Dave Horsfall
2016-03-23 1:51 ` Milo Velimirovic
2016-03-23 6:49 ` Greg 'groggy' Lehey
2016-03-23 7:02 ` Peter Jeremy
2016-03-23 7:12 ` Greg 'groggy' Lehey
2016-03-23 13:54 ` Ron Natalie
2016-03-23 16:28 ` John Cowan
2016-03-23 8:20 ` Dave Horsfall
2016-03-21 11:07 ` Tony Finch
2016-03-21 12:06 ` John Cowan
2016-03-22 0:13 ` Greg 'groggy' Lehey
2016-03-22 0:48 ` John Cowan
2016-03-18 17:01 ` Pat Barron
2016-03-22 5:21 ` shawn wilson
2016-03-23 0:54 ` Clem Cole
2016-03-23 1:07 ` Clem Cole
[not found] <mailman.1.1458266402.23080.tuhs@minnie.tuhs.org>
2016-03-18 2:13 ` Johnny Billquist
2016-03-18 2:36 ` Charles Anthony
2016-03-18 2:26 Noel Chiappa
2016-03-22 0:56 Doug McIlroy
2016-03-23 1:58 Doug McIlroy
[not found] <mailman.1.1458784801.4499.tuhs@minnie.tuhs.org>
2016-03-24 10:17 ` Johnny Billquist
2016-03-24 11:35 ` Ron Natalie
2016-03-24 11:37 ` Johnny Billquist
2016-03-24 22:50 ` Peter Jeremy
2016-03-24 23:06 ` Johnny Billquist
[not found] ` <9CBDF635-2FC9-4855-8419-0413EC0336A7@centurytel.net>
2016-03-25 0:35 ` Johnny Billquist
2016-03-27 0:48 ` Dave Horsfall
2016-03-24 19:13 Nemo
2016-03-24 19:54 ` Milo Velimirović
2016-03-26 21:05 ` Ronald Natalie
2016-03-26 21:34 ` Charles Anthony
2016-03-26 22:09 ` Ronald Natalie
2016-03-28 20:32 ` scj
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