[sdiy] DIY PG-800?

[Ullrich Peter]

Hi!

> A PG-x00 substitute is probably not much more complex from
> the hardware
> side (just needs the implementation of a synchronous serial interface
> rather than using a UART for MIDI) but the really tricky bit would
> writing the firmware seeing as how the communication protocol
> is totally undocumented.

OK, it is also software but maybe it fills the time until you have a hardware solution:
http://greg.baumont.free.fr/index.php/2008/07/14/gb-800-synthesizer-programmer-a-roland-pg-800-emulator/

And you can have a look at the Service Manual of the PG-800 that is part of the JX8P Servoice Manual -
at least the schematics of the PG-800 are here. It works with an 8048 microcontroller that can normally be copied
as it had no code protection as far as I know. You should fine someone that has the PG-800 and can copy the 8048 for you...
http://manuals.fdiskc.com/flat/Roland%20JX-8P%20&%20PG-800%20Service%20Manual.pdf

maybe some information also in the MKS70 Service Manual:
http://greg.baumont.free.fr/download/RolandMKS70ServiceManualEnglish.rar

Ciao
Peter

http://www.ullrich.at.tt