7 Jan
2015
7 Jan
'15
1:57 a.m.
Bringing a conversation back online.
On Jan 6, 2015, at 6:22 AM, arnold(a)skeeve.com wrote:
(Or even earlier than ’81.) How did pdp11 UNIXes handle per process memory? It’s suggested
above that there was a 50-50 split of the 64KB address space between instructions and
data. My own recollection is that you got any combination of instruction and data space
that was <64KB. This would also be subject to limits of pdp11 memory management unit.
Anyone have a definitive answer or pointer to appropriate man page or source code?
Thanks,
Milo
Peter Jeremy
scripsit:
> But you pay for the size of $TERMCAP in every process you run.
John Cowan <cowan(a)mercury.ccil.org> wrote:
A single termcap line doesn't cost that
much, less than a KB in most cases.
In 1981 terms, this has more weight. On a non-split I/D PDP-11 you only
have 32KB to start with. (The discussion a few weeks ago about cutting
yacc down to size comes to mind…)