I have a retro EMCO F1P CNC machine with a matching M1 controller that comes with mini data cassettes containing the "Machine State Data" which must be fed into registers of the controller before operation.
Unfortunately my cassette is missing, but I have managed to find this MP3 recording of it online.
The machine also supports RS232 input of this data. So my question is thus, is the format of the audio in the mp3 recognizable, and would it be possible to deduct simply by looking at the audio in the MP3 to determine how to format the equivalent RS232 data?
Some hints are to be found on page 9 in the service manual of the machine:
RS232c interface (V24 and 20mA), 150 - 2400 bd tape recorder (Phillips MDCR) 600 signs/sec. (corresponds to 6 kbaud)
This way I would avoid having to find equipment to record the MP3 to a cassette, instead I could simply craft a binary file to send over TTY from my laptop, and even better, write a small software that would craft this file on the fly based on parameters selectable from an UI.
EDIT: Here is a picture of the cassette player: