Donn Steward CPUville 8-bit Manual de instrucciones - Página 13

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Register Display Schematic

The register display is simple. The register outputs and processor flags are brought to the inputs of the

74LS240 inverting buffers from the main board through the display connector. The state and system

clock signals are brought in from the control board through the 16-pin front panel connector. The LEDs

are connected to the buffer outputs so that the buffer "sinks" current from the LED, causing it to light

when the buffer input is +5V (a logical 1). The pushbuttons and clock and reset switches are connected

to their respective circuits on the control board through the front panel connector. The bypass

capacitors filter out power line voltage spikes.