sw-cor24-pascal — Pascal for COR24

Pascal compiler(s) and runtime library targeting the COR24 p-code VM.

Repository Structure

compiler/    Pascal compiler (C, compiled by tc24r, runs on COR24)
runtime/     Runtime library (written in Pascal)
scripts/     Build and utility scripts

Pipeline

Single-unit (default)

.pas  ->  p24p (compiler/)  ->  .spc
                                  |
runtime/runtime.spc  -------------+
                                  v
                          pl24r (linker)
                                  |
                                  v
                          pa24r (assembler)  ->  .p24 bytecode
                                                      |
                                                      v
                                              pvm.s (COR24 VM)

Multi-unit

unit.pas  ->  p24p  ->  unit.spc + unit.spi
main.pas  ->  p24p (with SPI)  ->  main.spc

pa24r unit.spc  ->  unit.p24
pa24r main.spc  ->  main.p24

p24-load main.p24 unit.p24 p24p_rt.p24  ->  image.p24m
pvm.s image.p24m

Language Features

• Integer, boolean, char types
• Arrays, records (including array fields), pointer types (^T)
• new / dispose for heap allocation
• Procedures and functions (nested, forward-declared, pointer return types)
• User-defined units (unit/interface/implementation) with cross-unit procedure calls
• Control flow: if/else, while, for, repeat/until, case, exit
• Standard I/O: read, readln, write, writeln
• 128 string literals (packed pool)
• Up to 256 symbols, 128 procedures, 32 KB source input

Dependencies

Sibling repos (cloned under ~/github/sw-embed/):

• sw-cor24-pcode — p-code assembler (pa24r), linker (pl24r), VM (pvm.s)
• sw-cor24-emulator — COR24 emulator (cor24-run)

Quick Start

# Build p-code tools
./scripts/build.sh

# Run a Pascal program
./compiler/scripts/run-pascal.sh compiler/tests/t01_factorial.pas

# Run a multi-unit program
./compiler/scripts/run-multi-unit.sh compiler/tests/t37_multi_mathlib.pas compiler/tests/t37_mathlib.pas

# Run all regression tests
./compiler/scripts/test-all.sh

Projects Using This Compiler

• sw-cor24-basic — 1970s-terminal-inspired "Time Sharing" BASIC interpreter for COR24 ISA hardware and emulator.
• runtime/ — the Pascal runtime library in this repo is itself written in Pascal.

Links

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

License

Copyright (c) 2026 Michael A Wright. MIT-licensed; see LICENSE.