Yamaha RX21

Digital rhythm programmer

Yamaha RX21 drum machine
Check prices on Reverb

1985 (July)
Initially sold for ¥42,000

The entry-level RX21 was one of the cheapest programmable drum machines available in 1985.

It's very small, built with the classic Yamaha black plastic and rubber buttons. 9 decent voices, that are available directly from the pads, are used to create the 40 preset patterns.

Yamaha RX21 brochure
Yamaha RX21 brochure


Sound source

256Kbit wave ROM x 2
9 voices

Memory capacity

100 patterns
4 songs
512 maximum parts within songs

Connection terminals and interfaces

Output L, Output R, Output Phones
Cassette IN, Cassette OUT

Dimensions and weight

350w x 56h x 203d (mm) / 13-25/32” x 2-13/64” x 8”
1.3Kg / 2lb. 14oz.