Negroni

An emulator for the mythical computer “MIX” from Donald Knuth’s The Art of Computer Programming.

There are two components to negroni:

stir

The MIX emulator

shake

The MIXAL assembler

stir

This MIX emulator is fairly fully-featured, and almost all operations are implemented, but there are a few exceptions and limitations:

Limitations

• Writing to memory being accessed by an OUT operation, or reading memory being accessed by an IN operation will cause a panic.

Missing features

• Floating point operations (FADD, FSUB, FMUL, FDIV, FCMP) are not implemented.
• Only a binary version of MIX is emulated.
• No timing information is captured.
• Typewriter and paper tape I/O is not supported.

shake

Limitations

• String literals (for ALF operations) must be wrapped in double quotes.
• Remarks at the end of a line must begin with a #.

Missing features

• W-values are not supported beyond a single expression.
• Invalid usage of future values do not cause errors, and produce invalid programs.

Note

Please don’t actually shake a negroni; it bruises the gin.