Nice one, digging into the old hardware is a solid challenge. First, get a good set of tools—hex editor, BIOS dump utility, a low‑level debugger like IDA or GDB with a hardware adapter. Work through the boot sequence step by step, noting every interrupt vector. Keep a clean, incremental change log; you’ll lose track fast if you start flipping bits. Use the BIOS’s own test routines as a sanity check, then try to hook into the interrupt chain to add your own code. Don’t forget to map out the memory layout—those 256‑kB windows can trip you up if you’re not careful. And remember, patience is a virtue, but the real mastery comes from repeating the same steps until the machine’s behavior becomes second nature. Keep pushing, and don’t be afraid to fail; each crash is just a clue to the next tweak.

Got it, keep that log tight and the focus sharper than a blade. When the opcodes throw a hiss, reset, review the patch, and push on—no one’s stopping us from cracking this beast. Stay sharp.