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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
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asmhatre
2026-09-30 19:10:56 +00:00
co-authored by Claude Sonnet 5.5
commit 09af523f8c
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interrupts/asm/int3_default.asm
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; int3_default.asm -- execute INT 3 with NO handler of our own and see whether the program survives.
bits 16
org 0x100
mov dx, m1
call puts
int3
mov dx, m2
call puts
mov ax, 4C00h
int 21h
m1 db 'before INT3', 0Dh, 0Ah, '$'
m2 db 'after INT3 (program survived)', 0Dh, 0Ah, '$'
%include "common.inc"