pouët.net

Panyansonic by Fit [web]

One more... Panyansonic for the Panasonic JR-200UP

Marq - code, gfx conversion, tools, a lot of detective work
Yzi - sound

Big thanks to Tero H. for documenting the tape format!

To run the production you need a real machine, since the current 
emulators just can't cope with the VBI code. All you need to do is play 
back nyan.wav to the cassette port. On the Panasonic type the following 
before that:

mload:a=usr($1000)

The creation of this silly little thing required surprisingly lot 
effort. There is very little documentation available on the JR-200, so I 
had to resort to disassembling the ROM, going through the data sheets of 
the chips, and simply trying out what different values do when poked to 
the I/O area. The graphics were pretty easy, whereas the sound and 
timing much less so.

For more Pana stuff, see here: http://www.kameli.net/marq/?page_id=1270