This vintage TX81Z is fully functional and in good condition.
The TX81Z is a 4 Operator multitimbral FM synthesizer with some limited internal effects. It features 8 voice polyphony, 8 part multitimbrality, reverb, delay, velocity, and aftertouch.
Polyphony - 8 notes
Oscillators - 4-Operator Digital FM synthesizer
#Instruments - 8 parts
Filter - None
Effects - Built-In Pseudo-Effects: Reverb by envelope modulation, Delay by re-triggering on free voices
Keyboard - None
Memory - 128 patches, 32 user, 24 performance setups
Control - MIDI (w/ Velocity and Aftertouch)
Date Produced - 1987