SimH simulator setup

Sometimes it is good to compare the w11a behavior with the PDP-11 software emulator from the SimH project. See INSTALL_simh for installation instructions and supported versions.

Under $RETROBASE/tools/simh two setup files are provided which configure SimH to reflect the w11a setup as close as possible:

setup_w11a_min.scmd
Very close to the current w11a state when it runs on an s3board
- processor: 11/70, no FPP, 1 Mbyte
- periphery: 2 DL11, LP11, RK11, PC11
setup_w11a_max.scmd
Planned configuration for the w11a, in addition
- processor: 4 Mbyte memory (as on Nexys2, Nexys3,...)
- periphery: in addition DZ11, RL11/RL02, RK70/RP06, TM11/TU10

Startup scripts are provided with each oskit. They call the w11a_max configuration, so will show in the emulator what w11a can do when finished.

All examples below use the same basic setup

set up vt100 emulator window for 1st and 2nd DL11
```
   console_starter -s -d DL0 &
   console_starter -s -d DL1 &
```
Note: the -s ensures that the port numbers used by SimH are taken!
the simulator is usually started with .scmd command file, for oskits for example with
```
   cd $RETROBASE/tools/oskit/<oskit-name>
   pdp11 <oskit-name>_boot.scmd
```

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SimH simulator setup

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