[TUHS] A PDP-10 used for UNIX just after the PDP-7?

[Thalia Archibald via TUHS]

On Jan 15, 2026, at 23:57, Ken Thompson wrote:
> after the pdp-7, unix was ported to more
> stock pdp-9 and pdp15 (both pdp7 upgrades)
> 
> no pdp-10 at bell labs.

Hi Ken,

So the "PDP-10" that Mahoney refers to is the PDP-11 with KS-1 memory
management? Seems like a strange machine.

And did you only ever use the one PDP-7 from the graphics group, and the other
PDP-9s and 15s were used by other groups?  Warner Losh writes that the PDP-7
UNIX “Total install base was 4 (1 pdp-7, 2 pdp-9 and 1 pdp-15)”.
    https://papers.freebsd.org/2020/fosdem/losh-hidden_early_history_of_unix/

Thalia