The early decision to use overall computer
control of the cyclotron, beam transport, and
data-taking system allowed each component of the
cyclotron to be designed and built directly for
computer control. To this end, all power supplies
requiring adjustment for different modes of operation
or trimming use as an internal reference a
D/A converter of from one decade (main RF anode
power supply) to six decades (energy analyzing
magnets). Each D/A converter has internal memory
requiring +24 volts at 50 mA to turn on each bit
and zero volts at 50 ohm impedance to turn off
each bit. Remote manual control is by means of a
digiswitch of appropriate decades using a complimentary
BCD code that connects each line to either
24 volts or zero. When the digiswitch is disconnected,
the D/A converter will remain as last set
and will maintain a +12 volt signal on each 'on'
bit and zero volts for each 'off' bit.