Commodore 64 Cassette Interface


Posted on Feb 4, 2014

U7 is a 6510 microprocessor. One of the features of the 6510 is a built in parallel I/O port (P0-P5). P3 - P5 control most of the cassette interface circuitry. P3 pin p6 of U7 outputs the write data signal to connector CN3 on pins E and 5. P4 is an input that senses the play switch depressed on the cassette deck. P5 is on output that controls thecassette motor.


Commodore 64 Cassette Interface
Click here to download the full size of the above Circuit.

When P5 goes "low", Q2 cuts off, CR2 regulates Vb of Q1 at 7. 5 volts, this forward biases Q1 and Q3, passing current through the cassette motor coil. U1 is a Complex Interface Adapter (CIA). Parallel ports, serial outputs, and Timers are standard features of the CIA. Read data enters on pins D, 4 of CN3. U1 accepts the read data signal on the FLAG input pin 24.




Leave Comment

characters left:

Related Circuits

  • New Circuits

    .

     


    Popular Circuits

    Capacitance meter
    Automatic Audio Shutoff
    A-one-transistor-fm-transmitter
    Digital circuits
    AVR 1.1V Internal ADC Reference Over-Voltage
    thermometer
    Linear Light Dimmer by Power Mosfet
    MICROPOWER METAL DETECTOR
    Slave Flash Trigger
    Second-order active band stop filter circuit



    Top