[pups] Unix and PDP11/20 (was PDP9?)

Holden's link, http://www.psych.usyd.edu.au/pdp-11/11_20.html reinforces my guess that our first -11 probably did have just "PDP11" on the bezel. The one in my photo (which has the 20) is doubtless our second -11. I've looked at this page before, but it slipped my mind. Our first -11 was very early, and its disk took several months to arrive: it had TTY33 and high-speed paper tape as its only peripherals besides the clock. Early on, for fun, we tried assembling the DEC-supplied assembler, which came on at least one (maybe more) long fan-folded paper tapes. I don't think we ever succeeded; it had to be fed in twice for the two passes, and enough characters were dropped that phase errors occurred. Incidentally, B programs could be run on this first pre-disk -11, using cross-compilation from GECOS. There was a stand-alone predecessor of dc! BTW, apologies for the units slip in the earlier posting. Indeed 128 words of RAM on the 11/10, 4096 words standard on the 11/20 (we splurged with 12K). Also BTW, the young woman on p. 104 of the first manual has a just-so-1969 hairdo! She has her index finger on one of the console switches, is holding a Unibus jumper in the other hand, and the caption is "The PDP-11 provides Direct Device Addressing...." The Unibus address pin assignments that replaced herwere probably more useful, but not so redolent of history. Dennis