Video for MS-DOS on PC-98
98VIDEOP is a basic video player that works in real mode in MS-DOS on PC-98. The file format supports temporal compression, up to 16 colours fixed palette and full 16-bit PCM compressed to 8-bit ADPCM sound of up to 44100 Hz sample rate. It is very specifically tuned to the hardware of a typical early-90s PC-98 (for instance, it always assumes 640x400 resolution) and thus this program won't run on IBM-compatible PCs. It is merely meant as a demostration not as a practical program for everyday use, obviously. If you somehow thought it was supposed to have practical value, you should check out other programs.
I have so far only tested this program in the Neko Project II emulator, so I would appreciate a test on real hardware.
Example videos can be found here
In brief: the PC-9801VX
CPU: Intel 80286, 12 MHz 80386 recommended for a 'reasonable' video, but lower quality videos don't require quite as much speed
RAM: 256 KB
GPU: μPD7220 with 16-colour capability
Sound: Buzzer with PIT, PC-9801-86 recommended for higher quality sound
Storage: Program itself is only a kilobyte or so, may need lots of megabytes for the actual videos though
I build the source using the GNU assembler. If you're at all interested in building this from source, well, there's only one source file :). The makefile and linker script are all you need, really, so just invoke make in the directory and you should be alright.