SIMUL: PDP-11 Simulator

@RedHat Home Notes Linux D22 SIMUL

Original SIMUL

SIMUL emulates a PDP-11 without MMU and it runs CPU tests loaded from a paper tape. SIMUL used to have a very cool built-in debugger which appears lost.

The code of SIMUL contains Russian comments in KOI-8. Set your browser appropriately.

SIMUL is written in PL/M language. The idea of PL/M comes from Hungarian system IDOS for Mitra-15. It was reengineered anew by Vladimir Butenko, to become a part of his PhD thesis later (in 1990 or so.)

First version of SIMUL was written by Ivan Bobrov, but it was not finished. I made it work more or less. Late Mikhail Flerov contributed suggestions that made SIMUL no less than 3 times faster.
errors_11.txt TODO list
floppy.plm 8 inch floppy disk.
pdp_11.plm The main loop. It also has a call to the missing debugger...
read.plm This section was written by Mikhail Flerov. SIMUL ran in 64K total (code + data) and emulated a machine with 56K of memory. READ implements a necessary virtualization.

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© Copyright 1986, 2000 Pete Zaitcev