URL for the PX4 manual

[Tony Duell]

The URL below contains several Epson PX4 manuals. Somebody (Dave?) was 
asking for technical info on that machine. There's no service manual, but 
there is the Operating System Technical Reference (it's the files 
starting with 'osrm'). It's really a programmer's manual, so it doesn't 
contain a full schematic, but it does contain I/O port details and 
pinouts of the connectors (including the cartridge port), and examples of 
how to design cartridges.

http://oldcomputers.dyndns.org/public/pub/rechner/epson/~fjkraan/comp/px4/doc/

May be of interest, anyway...

-tony