Yamaha CX5M MUSIC COMPUTER + YK-20 Keyboard +Composer II Cartridge

For sale is my Yamaha CX5m (MU) vintage Music Computer  with the original SFG01 FM unit (plus SFG-05 chip upgrade. No original packing, box.

This is an E.U. sale only and will not sell to anywhere else which involves customs paperwork.

I have just updated this listing as it NOW also includes a nice very rare YK-20 keyboard which plugs directly into the CX5 and is compatible with the SFG-01

It includes the actual computer + YK-20 Keyboard + monitor and Composer II cartridge + SFG05 upgrade chip

It is in good working order and good working and cosmetic condition for its age.
You can see it here:

It is a US version which means it is 110volts and has an American 3 pin mains plug on it. Because of the size it will be shipped in 3 seperate bundles. The monitor, The CX5, The Keyboard.

It cannot take MIDI in so you need to use the YK-20 keyboard. You need to upgrade the SFG-01 to the SFG-05 for MIDI IN. I include the SFG-05 upgrade chip but it will need soldering in place by somewone who know what they are doing.

IMPORTANT: If you live on one of the E.U. Islands message me before for a quote as couriers tend to be considerably more expensive or you are welcome to arrange an alternate courier

SFG-01 description

The SFG-01 FM Sound Synthesizer Unit is a FM music expansion with MIDI interfaces. The FM ton generator used is called OPM (YM2151). The cartridge contains also a stereo DAC (YM3012) and a MKS (YM2148). It is the first version of the SFG sound modules developed by Yamaha for their CX series.

For real-time playing it requires a proprietary keyboard (YK-01, YK-10 or YK-20) and it uses its MIDI ports only as an output to send data to a digital synthesizer, for example the Yamaha DX7, because its 16K ROM (MBIOS 1.0) does not have support for MIDI input.

It was released in 1983. Official launch price: ¥19,800

A SFK-01 module was also available, it's actually a SFG-01 without MIDI connectors. It means that MIDI features of the Yamaha software are not usable with this alternative module.

Abbreviations:

• OPM = FM Operator Type-M
• DAC = Digital to Analog Converter
• MKS = MIDI Interface & Key Scanner
• MBIOS = Music BIOS (same name as the BIOS from but totally different)

Firmware

From BASIC, the music firmware can be launched with CALL MUSIC or _MUSIC. If the module is used on a machine with MSX-MUSIC in a lower slot, you have to make the distinction between both extensions: to start the SFG firmware in this case, enter CALL MUSIC plus any additional letter or number (eg _MUSICA)

Note that on the MSX2+ Sanyo and Sony machines with built-in MSX-MUSIC, this ROM is in slot 3-3. The SFG-01 module can only be added into a lower numbered slot, therefore CALL MUSIC will always run the SFG firmware when this module is present (even with additional letter or number).

By default, the BRASS 1 voice is selected for both the polyphonic and monophonic modes and the music keyboard is split around the C3 center key: keys to the right play in monophonic mode, the other keys play in polyphonic mode.