TG100, used & still working, have got brand new PSU for them which puts a little on the price & who wants to buy something you cant use straight away.
The Yamaha TG100 Tone Generator MIDI Sound Module is a digital sound module designed for use with MIDI-compatible devices. It features MIDI input and output ports for connecting to other devices for creating and playing back sound. This model is ideal for musicians and producers looking to enhance their audio capabilities and achieve professional-sounding results in their music production. Also used extensively within gaming for old school sound & playback