Computer Controlled Eight Input Terminals

Figure 5 shows the circuit of the controlled eight input terminals. This is a simple arrangement of eight buffers whose inputs are taken directly from the eight input terminals on the front panel. The output of these buffers is high impedance, until a low signal pulse is received on the READ lead from figure 2. This low pulse allows the input to the buffers to be passed through the buffers and onto the data leads, going to the 40 pin connector of the '80. From there the computer processes the data, according to the program in memory.

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