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// The outputs of port A are used to drive LEDs, using
// ULN2003A or ULN2803A transistor arrays (rather than
// driving the LEDs directly via the 82C55A output pins,
// which can only source or sink 2.5 mA according to the
// data sheet.)
// ULN2003A or ULN2803A transistor arrays (rather than
// driving the LEDs directly via the 82C55A output pins,
// which can only source or sink 2.5 mA according to the
// data sheet.)
