21 Dec
2011
21 Dec
'11
5:01 p.m.
Dave McGuire wrote:
On Dec 21, 2011, at 4:38 AM, Pete Turnbull <pete at
dunnington.plus.com> wrote:
The biggest obvious difference is just the boot ROMs, 2K x 8 in the
PDP-11/23 and 23+ but 8K x 8 in the microPDP-11/23plus, with additional
diagnostics and stuff. And they tended to have different peripherals,
of course, but the CPU is essentially the same.
The microPDP-11/23plus came in a BA23, usually
the "storage heater" deskside style, but occasionally as a rackmount, which is
the same box but without the skins.
The PDP-11/23 and 11/23+ came in a BA11N or BA11S, and those don't have conventional
rails.
...both very much PDP-11/23s, regardless of the sticker on the front. ;) ...and I'm looking for one or two sets of the
rear flanges, if anyone has spares.
I just made some out of sheet metal.
--
Pete Peter Turnbull
Network Manager
University of York