Collection of notes on the hardware this should run on.

------------------
device layout per u0 src:

            address                     simh dev
rk03/rk11   177400     disk		RK
dc11        174000     tty?		(not supp?)
tc11/tu56   177340     dec tape 	DTn (not showing up in simh?)
rf11/rs11   177460     fixed head disk	RF
kw11-l      177546     clock		CLK
pc11        177550     paper tape	PTR/PTP
asr-33      177560     tty?		TTI, TTO


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man IV tap0 ... tap7 :
"all eight files exist even though at present there are only two physical
drives."

man IV tty
claims that tty is treated differently than tty0..tty5 and implies
that it is not used in multi-user mode.  This may pose a problem
if DC-11 is not supported.. we may only be able to run in single user
mode.
"By appropriate console switch settings, it is possible to cause UNIX
to come up as a single-user system with I/O on this device."

man IV tty0 ... tty5
says there are six tty devices.  u0 srcs sets ntty to 8+1 (8 dc-11 plus
one console?)

man V core
"It is exactly 8192+64 bytes long" 8k of user core.
this agrees with the definition of core in u0 as 4096 words long.
This also lines up with the statement that there was 24k ram:
u0 sets orig to 0, and core to 16k and ecore to 24k (core+8k).

------------------
set rk3 enabled
att rk3 rk3.dsk
set rf enabled
set cpu 11/20
set cpu 32K       ?    there was really just 24k in the real machine



--------------------
cpu
    probably 11/20 with 24kb  (or should that be 24k words = 48k?)
    could be 11/45 though.
pdp-11 releases:
    1970: 11/20, 11/15 
    1972: 11/40, 11/45, 11/05, 11/10 
    1973: 11/35 

"In 1971, when this manual was written, we had move off the original PDP-7
to the PDP-11/20; it had 24KB of core memory, and no memory management 
hardware at all. "
[...]
"By this time we knew about the upcoming PDP-11/45, and had visited 
Digital in Maynard to talk about it; in particular, we had the specs 
for the floating-point instructions it supported. So the system 
described here included a simulator for the instructions (fptrap(III))."
   - http://www.cs.bell-labs.com/who/dmr/1stEdman.html
     (describing nov 3, 1971 manuals)

-------------------------------------
section VII pg 5 has "boot procedures" section:
http://cm.bell-labs.com/cm/cs/who/dmr/man71.pdf

------------------------------------
http://en.wikipedia.org/wiki/PDP-11#PDP-11_instruction_repertoire

Has a reference on all the AS instructions in the PDP-11. This may come in
handy while fixing the OCR text.