[TUHS] Memory on Lion's v6

Andrew Hume andrew at humeweb.com
Wed Mar 2 01:31:36 AEST 2022

i should also point out that lions would have had access to
a PDP 11/70 running with 4MB of main memory at
the Australian Graduate School of Management (where i worked
for a while after graduating). but i don’t recall him doing anything on that machine.

> On Feb 28, 2022, at 3:27 PM, Andrew Hume <andrew at humeweb.com> wrote:
> the actual configuration of Lions’ PDP 11/40 was
> 	128 Kbytes of core memory, 
> 	a DJ11 terminal multiplexor and 
> 	three RK05 disc units each, 
> but note that because of the way the machines were bought,
> and because of addressing weirdness (the top 8KB were memory-mapped to I/O registers),
> Lions’ PDP actually had 112KB of main memory.
> the PDP 11/40 had 18bits of address space, so while processes were limited
> to 64KB, the system could have had 256KB.

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