Retro Computing — Compilers, Emulators & CP/M

A C compiler for the Z80 and CP/M, tuned for small code size. It produced smaller binaries than z88dk on all 47 tests of a public benchmark suite.

AI-built: I wrote none of this code Python ★ 11

A C23 compiler for the i386 and MS-DOS. It writes self-contained DOS .exe files. It compiled both DOOM and MicroPython end to end.

AI-built: I wrote none of this code Python ★ 7

The shared C23 frontend and AST optimizer behind uc80 and uc386. It parses, preprocesses and optimizes above the machine level. The target backend then emits Z80 or i386 from there.

AI-built: I wrote none of this code Python

A MicroPython port for FreeDOS on i386, compiled entirely through uc386. The port is the proof that the compiler works on a real codebase. The build emits a flat binary or a PMODE/W executable with a working REPL.

AI-built: I wrote none of this code C

A PL/M-80 compiler for the 8080 and Z80. It rebuilds the original CP/M utilities from their PL/M-80 sources and matches the Digital Research compiler on code size.

AI-built: I wrote none of this code Python ★ 12

A Cowgol compiler for the Z80 and CP/M. It analyzes the call graph across modules so subroutines that can never be live at once share the same local storage.

AI-built: I wrote none of this code Python ★ 3

An Ada compiler for the Z80 and CP/M 2.2. It compiles a subset of Ada 2012 to Z80 assembly. Work toward ACATS conformance continues.

AI-built: I wrote none of this code Python Ada under construction ★ 2

More than ninety worked Ada examples for uada80. They cover syntax, packages, generics, tasking and contracts.

AI-built: I wrote none of this code Ada ★ 1

An LR(1) and GLR parser generator. It emits the lexer and parser tables as a single JSON bundle plus re-entrant driver skeletons in C, C++, Python and Lua.

AI-built: I wrote none of this code Python ★ 1

A peephole optimizer for Z80 compilers. It shortens jumps to jr, folds counted loops into djnz, rewrites call/ret pairs as jp, and drops dead stores.

AI-built: I wrote none of this code Python ★ 2

A peephole optimizer for i386 compilers that emit NASM. It rewrites instruction patterns, strips unreachable functions, and splits a libc so a program links only what it calls.

AI-built: I wrote none of this code Python

A MACRO-80-compatible toolchain for Linux: the um80 assembler, ul80 linker, ulib80 librarian and ud80 disassembler. Together they build and inspect 8080 and Z80 .COM files.

AI-built: I wrote none of this code Python ★ 4

A pure-Python linker that reads 32-bit OMF object files and writes MZ+LE executables for DOS. It adds a PMODE/W or DOS/32A stub, so the result runs without dos4gw.exe or Open Watcom.

AI-built: I wrote none of this code Python

A peephole and AST optimizer for 8080/Z80 compilers. upeepz80 and uc_core supersede it. It stays here for reference.

AI-built: I wrote none of this code Python unmaintained

Runs CP/M 2.2 programs on Linux and Windows with no disk image at all: it translates BDOS and BIOS calls straight to the host filesystem. Z80 and 8080 CPU cores.

C++ ★ 11

A hardware-level Z80 emulator for the RomWBW HBIOS interface, with bank switching across 512 KB of ROM and 512 KB of RAM. It boots CP/M from ROM and from disk images.

Run RomWBW in your browser

AI-built: I wrote none of this code C++ WebAssembly ★ 8

A native Windows build of the RomWBW emulator, with a VT100 terminal and scrollback. It boots CP/M or ZSDOS from disk images.

AI-built: I wrote none of this code C++ ★ 8

The same emulator for Android phones and tablets, with a VT100 terminal, so Zork and WordStar run unmodified.

Download the APK

AI-built: I wrote none of this code Kotlin ★ 10

The iOS and macOS build. It runs CP/M 2.2 and CP/M 3, and downloads disk images from the RomWBW project. It ships on the App Store as Z80CPM.

AI-built: I wrote none of this code Swift ★ 6

An emulator for MP/M II, the multi-user CP/M. Several people connect over SSH simultaneously, and SFTP and HTTP clients read the same disks. The build compiles MP/M II from its PL/M-80 sources.

AI-built: I wrote none of this code Assembly ★ 5

A DOS emulator for iPad and Mac with a SwiftUI interface over DOSBox Staging. It boots FreeDOS, MS-DOS or the built-in kernel, and runs DOOM.

AI-built: I wrote none of this code Swift C++ ★ 3

An MS-DOS emulator for Linux that runs 32-bit DJGPP programs end to end. It answers INT 21h, DPMI and EMS calls on the host over an i386 CPU core.

AI-built: I wrote none of this code C++ ★ 2

A reconstruction of the lost MBASIC 5.21 source. The recovered MACRO-80 source assembles to a binary that matches the original mbasic.com byte for byte — the only proof of correctness that counts here.

AI-built: I wrote none of this code Assembly ★ 5

A Python interpreter for MBASIC 5.21 that runs original programs unmodified. The repository also has two compiler backends, which target CP/M .COM files and JavaScript.

Run it in your browser

Documentation

AI-built: I wrote none of this code Python ★ 7

A C++17 interpreter for the same dialect. It runs on Linux and macOS. A DJGPP build also runs on FreeDOS and MS-DOS.

AI-built: I wrote none of this code C++ ★ 1

mbasicc compiled to WebAssembly with Emscripten, wrapped in a program editor and a virtual filesystem.

Run it in your browser

AI-built: I wrote none of this code WebAssembly ★ 2

A floating-point BASIC for the 8080 and CP/M. The repository includes the translator that converted the original 8008 sources. 38 of 39 tests pass.

AI-built: I wrote none of this code Assembly ★ 2

A compiler for Infocom ZIL and the ZILF dialect. It emits Z-machine story files from .z3 to .z8, and compiles the Mini-Zork I source to a verified 350-of-350 win.

AI-built: I wrote none of this code Python ★ 2

A walkthrough generator for Z-machine interactive fiction: a CZECH-compliant interpreter, an AI solver and a replay harness. It has 50 verified complete solutions across versions 1 through 8.

AI-built: I wrote none of this code JavaScript under construction ★ 2

A specification of the Z-machine story-file format for versions 1 through 8, with a compliance test corpus. Every rule states which versions it applies to. The specification follows the Z-Machine Standards Document v1.1.

AI-built: I wrote none of this code ZIL

Compiles Z-machine story files (versions 1 through 8) to JavaScript that runs in a browser or under Node.

AI-built: I wrote none of this code JavaScript under construction ★ 1

A debugging tool that renders a story file as a PDF. The output has a room map with movement directions, the dictionary, and the objects a player can carry.

AI-built: I wrote none of this code Python ★ 1

A voice-controlled Z-machine interpreter for iOS and macOS. Speech recognition happens on the device, and the app reads the game text aloud. Players with low vision can thus play Zork with no screen at all.

AI-built: I wrote none of this code Swift ★ 1

An unpacker for the CP/M archive formats — LBR, ARC, squeeze, crunch and CrLZH. A Python 3 implementation and a native CP/M implementation produce identical output.

AI-built: I wrote none of this code Python ★ 8

Vintage manuals as PDFs and text conversions. They cover CP/M, MP/M II, Z80, 8008, MACRO-80, PL/M-80 and Microsoft BASIC. Reference material for everything above.

AI-built: I wrote none of this code Documentation