[TUHS] PDP-11/70 SPL (was: Early non-Unix filesystems?)
dave at horsfall.org
Mon Mar 28 05:59:43 AEST 2016
On Sun, 27 Mar 2016, Johnny Billquist wrote:
> I do not have any experience either way. I have never checked this. I'm
> just saying that it don't make sense in my head, and the processor
> handbook do not describe such a property of SPL. But now that I know,
> I'm going to try and find out.
I'll say it again: it's *definitely* how SPL worked (at least, on the
11/70 that I hung; too many witnesses...). Somewhere Out There (tm) is a
little self-relocating program that completely filled user memory with SPL
(including overwriting itself; the last act it did was to overwrite
itself, and was sheer genius). I saw it in a ;login: newsletter, so it
*might* be in AUUGN... When the PC wrapped around, it was SPLs all the
way down :-)
> It would also be interesting if anyone can come up with a good reason
> why SPL should work that way.
Likely a firmware bug?
Dave Horsfall DTM (VK2KFU) "Those who don't understand security will suffer."
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