On later models (PC-9821 series), NEC moved configuration settings into a battery-backed CMOS, but the interface to change them remained in a "Setup BIOS" accessible by pressing a key (often F2 or Del ) during POST. This stored:
Modern projects (like the "PC-98 SD-Bridge") include a custom BIOS extension that fits into an open option ROM socket. This BIOS hooks the disk INT 18h calls and redirects them to read from an SD card via a microcontroller.
In the West, when we think of the golden age of Japanese computing, our minds often drift to the sleek, white plastic of the NEC PC-9800 series. For nearly two decades, this platform dominated the Japanese market, hosting legendary franchises like Touhou Project , Ys , and countless visual novels. However, for modern enthusiasts looking to emulate these machines or for preservationists trying to revive aging hardware, one technical hurdle stands taller than the rest: the PC-98 BIOS.
This article explores the history, the technical intricacies, and the modern challenges surrounding the PC-98 BIOS.
The PC-98 BIOS is not a single monolithic chip but a collection of ROMs that handle specific subsystems: System ROM:
On later models (PC-9821 series), NEC moved configuration settings into a battery-backed CMOS, but the interface to change them remained in a "Setup BIOS" accessible by pressing a key (often F2 or Del ) during POST. This stored:
Modern projects (like the "PC-98 SD-Bridge") include a custom BIOS extension that fits into an open option ROM socket. This BIOS hooks the disk INT 18h calls and redirects them to read from an SD card via a microcontroller. pc-98 bios
In the West, when we think of the golden age of Japanese computing, our minds often drift to the sleek, white plastic of the NEC PC-9800 series. For nearly two decades, this platform dominated the Japanese market, hosting legendary franchises like Touhou Project , Ys , and countless visual novels. However, for modern enthusiasts looking to emulate these machines or for preservationists trying to revive aging hardware, one technical hurdle stands taller than the rest: the PC-98 BIOS. On later models (PC-9821 series), NEC moved configuration
This article explores the history, the technical intricacies, and the modern challenges surrounding the PC-98 BIOS. In the West, when we think of the
The PC-98 BIOS is not a single monolithic chip but a collection of ROMs that handle specific subsystems: System ROM: