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Y > YAMAHA  > C1   


The Yamaha C1 was released in 1987 and is basically a 80286 processor based PC with 8 built in MIDI ports for use in applications where there are many MIDI instruments to address.

By 1987 some machines which were capable of responding on multiple MIDI channels were appearing, and some earlier machines could only function in "omni" mode which meant that they needed a whole 16 channel port to themselves or they would play every time a note intended for another instrument was sent.

Since MIDI information is fairly 'slow' in respect to what even a about 10Mhz computer can handle 8 output ports with buffers wasn't a difficult thing to pull off for even an old 286 apparently.

Various DOS applications were included, among them the Voyetra Sequencer which was set up to run all 8 ports.


Contributors : Bob Weigel (picture, info), Gareth Qually (info, specs)

Javier Z. reports:
Yamaha C1 Music Computer was used by Kraftwerk in "Electric Cafe".

We need more info about this computer ! If you designed, used, or have more info about this system, please send us pictures or anything you might find useful.
Please consider donating your old computer / videogame system to or one of our partners from anywhere in the world (Europe, America, Asia, etc.).


The day my C1 died was a sad one indeed. Loved the ease of the Voyetra sequencing software, and not having to use an outboard midi patchbay back then was awesome. With 8 outs and 2 ins I easily ran my entire studio, including:

Juno 106
Cheetah MS-6
Cheetah MS800
Oberheim Matrix 6R
Roland D110
Yamaha SPX-900
+ a pair of midi-CV boxes to drive older analogs.

Would love to have that rig again...

Tuesday 8th February 2011

Kraftwerk''s Electric Cafe was recorded during 83-86 with the Synclavier. Two C1 machines were used on stage in late 90''s only

Wednesday 5th May 2010

Hello, I''m looking for a Yamaha C1 computer, please contact me :

Saturday 29th July 2023
Marcello (Italy)


TYPE  Portable
YEAR  1987
KEYBOARD  88 keys with numeric keypad and arrow keys
CPU  Intel 80286
SPEED  switchable clock 10/8 MHz
RAM  640 Kbytes main, 512 Kbytes extension
ROM  64 Kbytes
TEXT MODES  40 or 80 columns x 25 lines
COLORS  Monochrome blueish LCD display
SOUND  Buzzer
SIZE / WEIGHT  394(W) x 382(D) x 82(H) mm / 8.2 kg (18 lb 2 oz)
I/O PORTS  Time Code In, Time Code Out (both via RCA ports), 2 x serial ports, Expansion Card Slot, 8 x MIDI OUT ports, 2 x MIDI IN ports, 1 x MIDI THRU port, Digital RGB out port, CGA or Monochrome (Hercules compatible) mode
BUILT IN MEDIA  3.5'' Floppy disc drive (1.44 MB) + 20 MB hard disk
OS  MS-DOS 3.3
POWER SUPPLY  Built-in power supply
PRICE  Unknown

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