Is your PiDP/8 installed and running? If so, in /opt/bootscripts there is a readme.txt that should explain all:
On startup, scanswitch passes the script number to run on to pidp8,
based on the IF switch settings.
Standard boot scripts:
IF switches filename description
----------------------------------------------------------------------
001 1.script : OS/8 on 32K PDP-8 with RK05 disk cartridge
010 2.script : TSS/8
011 3.script : OS/8 on DECtape. This uses SLOW td0, not dt0
100 4.script : spacewar! with vc8e output on localhost:2222
101 5.script : (empty)
110 6.script : (empty)
111 7.script : (empty)
----------------------------------------------------------------------
So, if you switch the IF to 100, and execute the "do it" switch
sequence, 4.script runs. Looking in 4.script, it does this:
echo Press ctrl-E to quit
echo Keyboard controls from vc8e program:
echo Player 1 Player 2 Command
echo 1 9 fire weapon
echo 2 0 rotate CCW
echo 3 - rotate CW
echo 4 = thrusters
echo Press both rotate keys simulatenously to warp into hyperspace
echo Type 'o' in PDP-8 emulator window to get a list of features
l ../imagefiles/spacewar/spacewar.bin
at ttix 2222
set ttox0 8b
g 200
So /opt/pidp8/imagefiles/spacewar/spacewar.bin is where the program resides, and there it is.
So the good news is, you should be all set! Set the IF switches to 100 and toggle Single Step.
best,
dylan