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

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
2026-09-30 19:10:56 +00:00
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+; dbg_cd03.asm -- the same program, but the breakpoint is the two-byte CD 03.
+bits 16
+org 0x100
+    mov ax, 1111h
+    db 0CDh, 03h            ; CD 03  (NASM's `int 3` would emit exactly this)
+    mov ax, 2222h
+    mov ax, 4C00h
+    int 21h