The Philips NMS-1205 was an FM sound synthesizer cartridge which was intended for usage with the MSX

MSX

MSX was the name of a standardized home computer architecture in the 1980s conceived by Kazuhiko Nishi, then Vice-president at Microsoft Japan and Director at ASCII Corporation...

 Personal Computer

Personal computer

A personal computer is any general-purpose computer whose size, capabilities, and original sales price make it useful for individuals, and which is intended to be operated directly by an end-user with no intervening computer operator...

. The chip was first produced in 1984. http://www.faq.msxnet.org/msxaudio.html

Product Information

32kB sampleRAM for the ADPCM unit

MIDI interface (in/out/thru)

connector for music keyboard (NMS-1160)

2 tulp mono Audio-out connectors

builtin microphone (mono)

external microphone connector (mono)

When external microphone or line is connected the internal microphone is automatically disabled

Volume adjuster (Sample volume)

audio-in connector (mono, tulp, to sample from a "line"-source)

built in software (Music-BOX, CALL MUSICBOX)

It was only sold in Europe