A Python emulator for DEC's PDP-8 computer.
There are already several emulators for the PDP8.
The most widely known emulator is written in C.
Many Pi users (myself among them) are more comfortable with Python, and writing my own emulator seemed the best way of making sure I understood how the PDP-8 worked.
The project was developed using Python 3.5. The assembler depends on reggie-dsl.
The emulator and its assembler (also written in Python) are almost complete and they can run many of the sample programs in DEC's 1969 Introduction to Programming.
I have not yet implemented auto-increment registers but I will do so.
I have not yet implemented interrupts, partly because I am stuck working out how to do create an end-to-end test.
I can write unit tests but these will just verify that I've written the code they way I think the PDP8 works.
I need a known-good program to run that will verify correct implementation. Suggestions welcome!
The emulator currently supports a tape reader and punch, but it does not implement any of the optional features, nor does it yet support disk operations.
Test coverage is heading towards 100% but the code is largely uncommented for now.
I will add comments and documentation as time permits.
I have a number of follow-on projects in mind. These are outlined in ROADMAP.md.