8 Jul
2002
8 Jul
'02
2:53 a.m.
Hello from Gregg C Levine
I've got a question for those of you, who work more in that field then I.Has
anyone successfully gotten, say, NetBSD, or anything along the lines of the
4.4 series to run on a PDP-11? Granted I don't think it would work there,
because of the way its hardware was constructed. Or for that matter, say
Linux? Since the Simh collection builds easily on Linux, I was thinking that
it would be relatively simple to do so.
Gregg C Levine drwho8(a)worldnet.att.net
"How many floors does this TARDIS of yours have, anyway?"
8 Jul
8 Jul
2:59 a.m.
On Sunday, 7 July 2002 at 22:53:46 -0400, Gregg C Levine wrote:
Hello from Gregg C Levine
I've got a question for those of you, who work more in that field then I.Has
anyone successfully gotten, say, NetBSD, or anything along the lines of the
4.4 series to run on a PDP-11? Granted I don't think it would work there,
because of the way its hardware was constructed. Or for that matter, say
Linux? Since the Simh collection builds easily on Linux, I was thinking that
it would be relatively simple to do so.
The big issue is address space. It's difficult enough shoehorning
2.11BSD onto the PDP-11. It's well-nigh impossible to retrofit 32 bit
operating systems. But Steven M. Schulz will doubtless give you a
better explanation.
Greg
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3:43 a.m.
In article by Greg 'groggy' Lehey:
Has anyone successfully gotten, say, NetBSD, or
anything along the lines of the
More specifically, the issue is data space. Using overlays, you can
have a process with more than 64Kbytes of instruction space on a PDP-11,
but the maximum data space that a process can have is 64Kbytes.
The kernel is in a similar situation, but with some PDP-11 models
there is kernel mode and supervisor mode, giving you two separate
64Kbytes instruction + 64Kbytes data address spaces (and overlays
to increase the I space).
I can't see Linux fitting into 128K of data space, and GCC is definitely
out of the question. Besides, 2.11BSD already looks pretty close to 4BSD :-)
Warren
4.4 series to run on a PDP-11?
The big issue is address space. It's difficult enough shoehorning
2.11BSD onto the PDP-11. It's well-nigh impossible to retrofit 32 bit
operating systems. But Steven M. Schulz will doubtless give you a
better explanation.
Greg
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Greg 'groggy' Lehey -
Gregg C Levine -
Warren Toomey