Thanks Robert, that is perfect! I actually just opened the $A1 ADX to see you wrote it :)

So (using $A1), if I am understanding correctly, I would:

- Send the hex string F4 57 01 00 B4
- Receive 63 bytes of data to be processed/displayed
- Take a short break
- Do this over and over again

And as far as processing the data, I would find the TPS value as the 9th byte of the response.

Is that correct? If so I guess I'm going to go crawl around the attic and see if I can find a 7730.

- Frank