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7F9B: Telephone call status flags
Used by the routines at 75F6, 76FA, 776F, 77D3 and 7A0C.
Bit(s) Meaning if set
0 Unused
1 The telephone call is finished (disconnected)
2,3 Unused
4 A digit is being dialled
5 The destination telephone is ringing
6 Sam must give a name in response to 'WHO'S THERE?'
7 Sam has picked up a ringing telephone
7F9B DEFB $00
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