"Dave" wrote in message
...
| Rate chips are ~$200, at least that's what I've been able to determine
| regarding their pricing for other countries. In the US they just say
| that "rate prom upgrades are free when you have an active pitney bowes
| service contract".
|
| I changed 2 bytes of data, burned another Eprom and plugged it in but
| upon powerup I got an error message. There must be a checksum burned
| in there.

I assume the idea of analysing the rest of the circuit is unprofitable? Can
you post a hex dump of the ROM somewhere? Some of us are good at guessing.

N