Topic summary
PC-9801
Extracted from the Wikipedia article PC-98.
Sound
The first generation of PC-9801s (the E, F and M models) only have an internal buzzer. PC-9801U2 and later models can change the sound frequency by controlling the programmable interval timer, like the PC speaker. The PC-8801mkIISR home computer, introduced in 1985, has a Yamaha YM2203FM synthesis, an Atari joystick port and BASIC sound commands. The optional PC-9801-26 sound card is based around these features, although in some PC-9801 models it is integrated with the motherboard. It was replaced by the PC-9801-26K to support the 80286 CPU. This became the most common sound card for playing in-game music on the PC-98.