Wire up three real, public-domain ROMs from the silicon era and prove
they boot end-to-end on the clean-room chip implementations. Each
test reads a separate well-known boot artifact:
* Busicom 141-PF firmware (4004, 1 KB, Intel PD 2009)
Wires real 4004 + real 4002 chips on the multiplexed nibble bus.
Toggles TEST every ~400 phases to mimic the printer-drum encoder
pulse the firmware polls. Asserts >2000 opcode fetches, >15 unique
PC addresses, and >100 CMROM strobes.
* Palo Alto Tiny BASIC v2 (8080, 1.9 KB, Wang 1976 PD)
CPUville port loaded from Intel HEX. Fake polled 8251 UART at port
0x02 (data) / 0x03 (status). Asserts the captured TX stream
contains the BASIC "OK" prompt — proving the interpreter reached
its REPL.
* Galaksija ROM A (Z80, 4 KB, Voja Antonić PD 1984)
ROM A+B at 0x0000..0x1FFF, system RAM at 0x2000..0x3FFF. Asserts
PC visits the JP target 0x03DA from reset and the ASCII "READY"
prompt appears in RAM after init.
ROMs are downloaded to roms/{4004,8080,z80}/ and gitignored — the
tests skip cleanly when the binaries are absent. License-clean: no
GPL ROMs, all PD by upstream provenance.
Total: 126 → 129 passing, 0 todo, 0 failed; 19 → 22 test files.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
David Montero