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Add interrupts module: INT 3 (CC breakpoint) vs INT 21h (DOS services)

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NASM sources, DOSBox/FreeDOS Debug/Unicorn harness, captured output and 31
assertions backing the ankurm.com article "INT 3 vs INT 21h in 8086 Assembly".

Co-Authored-By: Claude Sonnet 5.5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01KqJyCidz3ZgRyHABv2GVJh
This commit is contained in:
asmhatre
2026-09-30 19:10:56 +00:00
co-authored by Claude Sonnet 5.5
commit 09af523f8c
27 changed files with 1029 additions and 0 deletions
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interrupts/scripts/fetch-debug.sh
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#!/usr/bin/env bash
# Download FreeDOS "Debug" (MIT licence, a DEBUG.EXE-compatible debugger) into ../build/.
# It is NOT committed to the repository.
set -euo pipefail
cd "$(dirname "$0")/.."
mkdir -p build
if [ ! -f build/DEBUG.COM ]; then
curl -fsSL -o build/debug.zip https://www.ibiblio.org/pub/micro/pc-stuff/freedos/files/repositories/1.3/base/debug.zip
unzip -o -q -j build/debug.zip BIN/DEBUG.COM APPINFO/DEBUG.LSM -d build
fi
grep -E '^(Title|Version|Entered-date|Copying-policy):' build/DEBUG.LSM || true