This download package contains:
- The circuit diagram
- The memory dump for the EPROM
- The source files of the SB-6668 V1.0 software
- The source file and memory dump of original software for the PM-6668
- A copy of the service manual of the PM-6668
Come to think of it, that's quite a treat, don't you agree.
The software must be programmed in a 27C256 EPROM and is supplied in the Intel Hex format.