the computer. One set samples 21 input signals, two flip-flops and the logical *or" of 7 discrete output signals. Program Load - The main input for loading numerical data and instructions into the computer memory is a punched tape (paper or mylar). Information can be entered into the computer at a maximum rate of 800 five-bit codes per second from a photo-electric tape reader. Data can be entered manually from a keyboard if a computer manual control panel (CMPC) is available. Detector - The detector input is an "on - off" type signal received from an external source and indicates the working status of a specified piece of external equipment. The detector input monitor can be "reset" by means of a special instruction. Incremental - The incremental inputs are basically independent of program control and consist of seven resolver type, two variable incremental type, and one pulse type. These inputs are accumulated in the two four-word input buffer loops (V&R). Voltage - The computer is capable of converting one of 32 dc voltage inputs into an 8-bit binary number under program control. Analog voltages are grouped into four sets of eight inputs each. The range is + 10 volts with an accuracy of 200 mV. Cable - Cable inputs are serial messages of up to 96 bits in length entered into one of four words of the C-loop. Maximum data rate in 1600 bits per second. Cable input operation is begun by executing the Enable Cable Input instruction and proceeds basically independent of program control. Radio - Radio inputs are serial messages of unlimited length entered into one word of the C-loop. After 24 bits are accumulated, the information is transferred to channel MX Sector 054 and the loop is prepared to accept another 24 bits. Maximum input data rate is 100 bits per second. The operation is begun by an instruction and proceeds basically independent of program control. External Reset - Master Reset (Mr), Enable Write (Ewc), Initiate Load (Fsc) for checkout only, Halt Prime(K'hc), Run Prime (K'rc),Single Cycle Prime (K'sc). Output Unit Discrete - The discrete outputs provide two independent sets of output lines (32 and 15) for a total of 47 "on - off" type signals. The outputs are modified under program control and are sent to equipment external to the computer. Voltage - There are four dc voltage output lines available with each proportional to an