sw-cor24-forth — Tiny Forth for COR24

Clean-room DTC (Direct Threaded Code) Forth for the COR24 24-bit RISC soft-CPU ISA. Assembler kernel (forth.s), self-extending in Forth.

Part of the COR24 ecosystem.

Provenance

Forked from sw-vibe-coding/tf24a as part of the COR24 ecosystem consolidation under the sw-embed organization.

Prerequisites

• cor24-run — build from sw-cor24-emulator
• sed-rs — used by test scripts

Quick Start

# Run demo
./demo.sh

# Interactive REPL
./demo.sh repl

# Run test suite
./demo.sh test

# Or via build script
scripts/build.sh

Architecture

• forth.s — 2600+ line COR24 assembly implementing a complete DTC Forth
• Register allocation: r0=W, r1=RSP, r2=IP, sp=DSP
• Cell size: 3 bytes (24-bit words)
• I/O: UART at address -65280 (0xFF0100)

Built-in Words

+ - * AND OR XOR = < 0= DUP DROP SWAP OVER >R R> R@ @ ! C@ C! EMIT KEY EXIT HERE LATEST STATE BASE , C, ALLOT WORD FIND CREATE : ; IMMEDIATE [ ] EXECUTE NUMBER . LED! INTERPRET QUIT CR SPACE HEX DECIMAL DEPTH .S WORDS BYE

Examples

See examples/ for .fth source files demonstrating colon definitions, LED control, math, and more.

Related Repositories

• sw-cor24-emulator — COR24 emulator + ISA
• sw-cor24-project — ecosystem hub

Links

• Blog: Software Wrighter Lab
• Discord: Join the community
• YouTube: Software Wrighter

Copyright

Copyright (c) 2026 Michael A. Wright

License

MIT License. See LICENSE for the full text.