ACM diagnostic screens

The ACM has a diagnostic screen, which can be accessed by a special key combination on the receiver.

Ferguson: Menu, 1 (Programme Control), 0.
ITT-Nokia/Salora:
Philips: Menu, 0
Tatung: Menu, 1 (Programme Control), 0 (hidden diagnostics)
- There is another hidden menu screen where pressing 0 allows AGB (audience survey) to be turned on or off.

Field	Contents	Generated by	Notes and observations
1	ACM software version	ACM	Earlier ACMs (`E01` prefix) show `V1.20 V1.50`, while later units (`E02` prefix) show `V1.50`.
	SI data status	Receiver	Tatung: `NO SIG`, `NO SI`, `SI GC`, `SI NG`.

Diagnostic screen