ocr: C64 CIRCUIT THEORY RP3 9.3K RI 3.3k *OUNREG +50-MA -50- V R2ASK FI CB 21 EN4401 2746 M L8 L POP Ycc AEC R4 FPa9B TNEL V 25VE R33 Q2 N 1755 rB2 CASYMOTOR 3 I0V7 F2N3904 14 AI3 CASS SENSE AI2 ASS WRL A1l CASS RD A +5 FB3 CI U7 G510A MPU C2+ ANMI L ZC CASSRD LAS 07 A PA? PAB PA4 2 A5 UE 6526 CIA R9S PBO (DÇOO PBI DCFF) PA5 PRf PR7 CNT SP TOD GND] The Cassette Interface Circuits. U7i is a 6510 microprocessor. One of the features of the 6510 is a built in parallel 1/0 port (PO-P5). P3 - P5 control most of the cassette interface circuitry, P3 pin 26 of U7 outputs the write data signal to connector C ...
