Commodore CASSIOPEI, User Manual

Page: 66 / 76

Audible warning:
For users who want to stay alert and desire an audible warning when the voltage becomes to high, a
“beeping” sound can be generated through the speaker when over voltage occurs.
This however
requires the speaker switch to be in the upper position.
This is required because the beep is
nothing more then a signal applied to the tape read signal (to which the speaker is connected in the
upper position of the speaker switch). When the speaker switch is in the lower position the
Cassiopei cannot control the sound of the speaker and therefore cannot generate an audible alarm.
It is however possible to disable this audible over voltage alarm functionality, this can be done by
changing the alarm setting in the settings file from the value 1 to 0
Enable the audible alarm functionality:
ALARM_OVERVOLT=1 ;speaker switch must be in upper position to hear alarm
Disable the audible alarm functionality:
ALARM_OVERVOLT=0
Now you may want to ask yourself, why would anyone want to disable this audible alarm
functionality. Well, let's say that you have a computer that works fine but for some reason the
overvoltage detection trips and the alarm sounds. And you are absolutely positively 100% sure that
your power supply isn't failing. Then you have a different problem, because in order for the
Cassiopei to produce sound through the speaker, it has to generate signals on the read-line (the data
that holds the tape signals). Meaning that normal data trafic AND cassiopei functionality is no
longer possible. It does not matter if the switch is in the upper or lower position. For those very
special circumstances it may be useful to disable the audible over voltage alarm functionality.
For all other normal users, there is one thing to be aware of: when the over voltage detection trips
there is undeniably a serious problem with your power supply!
A serious problem that does
need immediate attention. Therefore, it does not make sense to disable this audible alarm in order to
continue working on a computer that could be damaged beyond repair within minutes or if you are
lucky days.
2019-10-27 Page 66 of 76 CASSIOPEI v2.0