PiDP11

Using Pidp-11

The instructions described under "prepare your Pi" option #2 make a few assumptions

After executing the instructions (

/opt/pidp11/install/install.sh )you get

Install the necessary raspbian packages
Modify your system to start pidp11 at boot
/etc/init.d/pdp11 is a link to /opt/pidp11/etc/rc.pidp11
In the /home/pi a file pdp.sh is installed.
At the end of .profile pdp.sh is started
Pdp.sh starts using screen a connection to the already running pdp11 smulator.

Startup procedure

/etc/init.d/pdp11 is a link to /opt/pidp11/etc/rc.pidp11
and starts starts /opt/pidp11/bin/pidp11.sh

This script uses /opt/pidp11/bin/scansw
My guess scansw reads the blinkenlight console to select what to start.
Then /opt/pidp11/bin/getsel.sh is used to choose the system from /opt/pidp11/systems/selections
and start it.

Beware the numbers in /opt/pidp11/systems/selections are 16 bit octal numbers
e.g. 0107 for unixv7 is decimal 71

To run without console I did modify /opt/pidp11/bin/pidp11.sh, It does not use scansw but is force the selection to unixv7 (71/0107).

When the pi is booted start a terminal and

bash ./pdp.sh

wiill get you in the simulator.

The boot commands shown on screen will start unixv7 single user.

Beware system commands are in /etc no /sbin no /usr yet.

You are now in single user mode

First change the root passwotd with

passwd root

Going to multiuser mode will execute the comand in /etc/rc (= shell script)

Go into multiuser by typing Cntl-D

You have all unix v7 commands.

Beware erase char is # kill is @

the is NO command like more.....

to stop unix

sync

Cntl-E

sim> exit

PiDP11

Construction

Operation