PC-9801 used a built-in kanji rom chip for Japanese text display. Ordinary PC-9801 output is 640x400, 16 colors, 56Hz refresh, 24kHz horizontal frequency. PC-9801 graphics subsystem is completely different than Western CGA/EGA/VGA standards. On a PC-9801, A: is always the drive you booted from. On an IBM PC, the floppy drives are A: and B: while the first hard disk is C. Drive letters are assigned differently. Hard disks use a different type of partition table IBM PCs of the 80s and 90s used a mix of 8-bit and 16-bit ISA buses before being replaced with PCI. PC-9801 used C-bus, a 16-bit data bus designed by NEC. BIOS, port addresses, memory map are all different PC-9801 MS-DOS is essentially a modified port of IBM PC-compatible MS-DOS.Ĭombined together, an Intel(-ish) CPU and a Microsoft(-ish) OS mean that the PC-9801 can read and execute IBM PC-compatible software to a degree, and many basic command-line utilities will work fine on either system.īut beyond that very basic level of compatibility, the machines are really quite different. The pc-9801 also runs MS-DOS, but it's not exactly the same as the MS-DOS in the West. Early pc-9801 models were equipped with intel-compatible chips designed by NEC (like the V30), but after a time intel chips like the 286/386/486/Pentium/Celeron were used instead. Like the IBM PC, the PC-9801 uses a CPU that supports the x86 instruction set. It might make sense to talk first about why IBM PC-compatibles and the PC-9801 series are similar, before moving on to the differences.
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