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Small guide for the PDP-6.

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README.md
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@ -99,6 +99,7 @@ There are some short introductions for beginners:
- [Assembling ITS](doc/NITS.md)
- [Com link mode](doc/comlink.md)
- [Logo](doc/logo.md)
- [PDP-6](doc/pdp6.md)
A list of [known ITS machines](doc/machines.md).

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# The PDP-6
### History
The MI AI Lab traded in a PDP-1 for a PDP-6 in the mid 1960s and used
it stand alone for some years. ITS was first written for this machine
and it was operational in 1967. The following year a PDP-10 arrived,
and it was arranged to share the I/O and memory buses with the PDP-6.
The PDP-6 continued to be the main timesharing machine at first, with
the PDP-10 as a subordinate processor. ITS was ported to the PDP-10
and eventually became the master.
The Dynamic Modeling group also received a PDP-6 in 1969, but quickly
moved on to a PDP-10. Their PDP-6 never saw much use.
### Simulator
Angelo Papenhoff's PDP-6 simulator is checked out in the `tools/pdp6`
directory. Using it is still in an experimental state. To run it, go
to `tools/pdp6/emu` and run the `pdp6` program. For shared memory to
work, the KA10 simulator must be started first.
### Stand alone operation
These programs work on stand alone on the PDP-6 simulator:
- SYSTEM GEN - Marks a bootable Microtape.
- MACDMP - Read, write, and start programs from Microtape.
- TECO - Text editor.
- MIDAS - Assembler.
### Shared memory
When the PDP-6 simulator is properly configured and started after the
KA10 simulator, the processors will share the PDP-6 core memory
between them. ITS has a facility to create a job and have it's
virtual memory range map to the PDP-6 core.
To make use of this, make a job named `PDP6` or `PDP10`. The latter
is from when the PDP-10 was the secondary processor. Reading or
writing locations in this job will now access the PDP-6 memory. It's
possible to load a program with `$L` or`:LOAD`. Starting, stopping,
stepping, or setting breakpoints is not possible. These must be done
from the PDP-6 console panel, or from DDT running on the PDP-6.