20 May
2009
20 May
'09
6:25 p.m.
Also, I *think* the VT05 has a bell in it and not a
buzzer.
FWIW the Teletype 43 has a real bell, operated by a solenoid. The VT50
series have a little relay which is pulsed to give the keyclick and fed
with a squarewaveto make the 'bell' sound (it sounds like what we call a
'raspberry').
Did any micros haev a bell rather than a speaker? Any other unusual
noise-makers for the ^G signal (The HP9830 has a normal speaker +
oscillator triggered by an output line from the CPU. But HP added a
little circuit to add an ampltude envelope to the sound to make it sound
a littler nicer. Typical of the quality of HP of that time!)
-tony