Aviation Electronics Technician 1 - Historic Naval Ships Association

DIGITAL COMPUTER.— The digital computerprocesses the applied digital data in three phases.After the three phases are completed, the entire cycleis repeated. All steps of each phase are performedsequentially according to a prewired program ofinstruction contained in the program. When electricalpower is applied to the digital computer, clock pulsesare generated within the clock generator of theprogram. The clock pulses are distributed by thecontrol logic to the sequence control, input receivers,symbol generator, and processor counter. Theprocessor counter is used to record a specific numberof clock pulses so that the demand-next instruction(DNI) pulse is not arbitrarily initiated. However, if ajump signal is received by the function decode, a DNIpulse is initiated. The jump signal may be repeateduntil the correct instruction is selected. When theDNI pulse is initiated and is in coincidence with aspecific clock pulse in the sequence control, a datarequest signal is applied to the program ofinstructions.SYMBOL GENERATOR.— The symbolgenerator operates in three major modes. The threemodes of operation are the line, circle, andanalog-to-digital conversion (ADC). Each mode isindependently and completely performed beforerepeating or starting a different mode. The mode tobe performed is initiated by the function decode in thedigital computer. Correct sequencing of each mode ofoperation is provided by the timing pulses from thecontrol logic section of the digital computer. TheFigure 5-8.-Heads-up display set block diagram.5-7