The PSG used on the PS/1 Audio is unknown, but sounds very similar to the SN76496 used on PCjr and its PCjr 3 Voice protocol. This was copied by the competing Tandy 1000 computer line with its Tandy 3 Voice protocol, however, Tandy continued innovating and added the Tandy DAC to all their later models, something IBM failed to do. So, by the time the PS/1 Audio card was released, IBM was now playing catch-up to Tandy. Not that it mattered, because the second generation Sound Blaster was now available, making both audio systems obsolete.
The card also features a DA-15 port for MIDI, a 3.5 mm microphone input jack, and a PS/2 joystick port.
Despite already being obsolete before it was even released, the PS/1 Audio card had a fair amount of support.
Some progress has been made emulating the PS/1 Audio card in DOSBox, but it has yet to be incorporated in the full release and must be built from source.
- vogons.org/viewtopic.php?f=32&t=18327 - VOGONS thread for adding PS/1 Audio emulation to DOSBox.