Of course there's also the language issue. So theoretically it should still be possible for DOSBox to properly emulate the unique graphics modes of the PC-98. The situation is the same with the Tandy and PC-Jr, with them having unique graphics modes too, but DOSBox (when set to Tandy or PC-Jr emulation mode) can properly emulate their unique graphics modes as well. While I assume that the PC-98 may also support the standard resolutions from IBM CGA, EGA, and VGA graphics cards, it also supports some unique graphics modes. However, if you look at a list of the standard graphics modes from 0x00 to 0x13 (which can be switched to with a simple INT instruction in assembly code, and are supported by most US sold computers), and look at the specs for these modes, you'll notice that none of them support the same resolution and palette-size combinations as the 2 previously mentioned PC-98 resolutions. The PC-98 supports these 2 unique graphics modes: 640x400 16-color mode and 640x400 256-color mode. For one, its graphics hardware directly supports 2 different graphics modes, not supported by standard graphics hardware in US computers. However there are other differences between old US IBM (and compatible) computers, and the Japanese PC-98. As far as I know, no computers sold in the US used an 8086 CPU, so I don't know if DOSBox can handle 8086 emulation, but if it can, then theoretically it can emulate a PC-98. It's basically an Intel 8088, but with 16-bit registers, instead of 8-bit registers. This is different than the IBM-PC, which had an 8-bit 8088 CPU, though unlike the next generation of IBM machines (which used 16-bit 80286 CPUs), the 8086 doesn't have all the extra instructions supported by the 80286. It does use an intel CPU, specifically a 16-bit Intel 8086. The PC-98 (full name being PC-9801) is a computer made by NEC, and only ever sold in Japan.
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