I said in my earlier post that I hadn't seen a fully ROM-based PC but I completely forgot about stuff like the HP and Psion and Atari PC handhelds!
In that vein, I've got an old V20-based NEC laptop (the PC-17-02[0], arguably an Ultrabook in its day) that booted MS-DOS 3.3 from ROM. It had a 2MB battery-backed RAM disk that the ROM got copied into. It showed up as a hard disk drive with an INT 13H-style interface.
In that vein, I've got an old V20-based NEC laptop (the PC-17-02[0], arguably an Ultrabook in its day) that booted MS-DOS 3.3 from ROM. It had a 2MB battery-backed RAM disk that the ROM got copied into. It showed up as a hard disk drive with an INT 13H-style interface.
[0] http://old.chuma.org/ultralite/index.shtml