ocr: THE USER PORT PIN CONFIGURATION" 123456781 9101112 ABCDEFHUKLMI N See Sheet 1 of Schematic for line definitions. Parallel port B of the 6526 CIA device at U4 (PBO-PB7) is made available on the user port. Parallel data transfers with external devices are made very easily through this parallel port. SP1 and SP2 are bi-directional serial ports. CNT1 and CNT2 are bi-directional synchronizing clock signals for each serial port. THE CONTROL PORTS PIN CONFIGURATIONS Control Port 1 Control Port 2 Pin Type Note Pin Type Note 1 JOYAO 1 JOYBO 1 2 3 4 5 2 JOYA1 2 JOYB1 o o O - o o 3 JOYA2 3 JOYB2 4 JOYA3 ...
