Casio CZ/ VZ/ FZ - Pro Series

--- In CZsynth@yahoogroups.com, "steve_the_composer" <smw-mail@...> wrote:
> Has anyone here deciphered the ROM/operating system? If so, I'd look 
> to see if there is any testing/handling of sub IDs. 

...if we disassemble/understand the CZ ROM code adding a few bits to
it won't be a problem. I had a look at the CZ-5000 service manual that
someone on this list made available and the CZ-5000 has a CPU with 4k
bytes internal ROM but also a 32K bytes external ROM. The internal 4k
bytes isn't much so the MIDI receiving code probably is on the
external ROM. It is likely that the external ROM can be replaced by a
pin-compatible Eprom.

I don't feel like opening my CZ-1 right now, does anyone have a ROM
dump of it? Are there any assembler/disassembler tools for the NEC
UPD7811G processor still available?

In the 80s I was an assembly language programmer. I only wrote code
for the Z-80, 6502 and x86 processors but I would gladly learn that
old NEC instruction set just to add the extra Sysex commands we need.

Joaquim