Pc-98 Bios Jun 2026

While original hardware decays, the BIOS lives on in emulators. Every time Neko Project II loads that bios.rom file, it resurrects NEC’s proprietary vision. And as the open-source revival efforts inch forward, we may one day see a PC-98 that runs entirely on free firmware—finally liberating this Japanese legend from its own proprietary past.

A Japanese developer (handle "bluerabbit") created an English-translated version of the PC-9821 BIOS. It replaces the Japanese POST strings with English equivalents. This is a literal hex edit over the original ROM.

A core function of the PC-98 BIOS was its integration with the character generator ROM to display Kanji and Kana. pc-98 bios

msg db 'Hello from PC-98 BIOS!', 0

start: mov ah, 24h ; write character mov bh, 7 ; gray on black mov si, msg .loop: lodsb test al, al jz done mov al, al int 18h jmp .loop done: ret While original hardware decays, the BIOS lives on

If you own a physical PC-98, the BIOS chips are usually labeled. Common chip types:

AH = 12h INT 18h

AH = 60h INT 18h Returns: DX:AX = 32-bit tick count (1 tick = ~55ms)

AH = 10h INT 18h Returns: AL = ASCII, AH = scancode A core function of the PC-98 BIOS was