The author of this page made his own patch editor for the TX81Z, which I use in my studio: https://github.com/mgregory22/tx81z-programmer It's honestly one of the simplest, and best patch editors I've used for any synth. I recommend it.
A little while ago I was working on doing a full teardown and writeup about the TX81Z. Unfortunately I just couldn't come up with enough interesting information that wasn't already better written by others in places like Matt Gregory's page. The only new and interesting thing my research came up with was how the cassette interface worked: https://ajxs.me/blog/How_the_Yamaha_FM_Synth_Cassette_Interf...
I'd really love to know more about the history behind the development of Yamaha's other FM synths, like the TX81Z. If anyone knows of any good books or resources (ideally in English, but let me know even if there's Japanese ones), I'd love to know about them.
A little while ago I was working on doing a full teardown and writeup about the TX81Z. Unfortunately I just couldn't come up with enough interesting information that wasn't already better written by others in places like Matt Gregory's page. The only new and interesting thing my research came up with was how the cassette interface worked: https://ajxs.me/blog/How_the_Yamaha_FM_Synth_Cassette_Interf...
I'd really love to know more about the history behind the development of Yamaha's other FM synths, like the TX81Z. If anyone knows of any good books or resources (ideally in English, but let me know even if there's Japanese ones), I'd love to know about them.