SPEED

300 baud throughput, programs saved twice for internal error checking, check-summing for data files.

CONTROLS

Keys for play, record, fast-forward, rewind, and stop. Sensor for software detection of key press. Counter for tape location.

FORMAT

Commodore propriety format using pulse-width modulation and square waves. Allows naming of programs and files, verification of programs, end of tape marker sensing.

TAPES

Uses standard audio cassette tapes. Digital tapes not required.

COMPATABILITY

• C2N/1530 - VIC20, C64, PET Series Computer
• 1531 - PLUS 4, C16

The electronics of the datasette contains read/write circuits that replace the audio-type circuits in a standard audio tape recorder.

Status/Motor Control - When the play switch is depressed, a ground potential is applied to the cassette enable line of the microprocessor. It, in turn, signals the cassette drive motor through a transistor switch located on the main computer board. The cassette is then ready for read/write operation.

Write/Record Amplifier - The computer outputs a square wave signal to the datasette. These TTL logic-level shifts are converted by the pre-amplifier and power amplifier to a proportional current output. This current output is then applied to the read/write coil of the head. Through induction, magnetic fields are produced on the tape representing the data.

Read/Playback Amplifier - The read amplifier circuit takes the reproduced transition signals from the tape and converts them back to TTL logic-level shifts. This is accomplished by an amplifier limiter which removes the amplitude variations and a switching circuit that toggles the output data between 0 and 5 volts. The signal is then ready for output to the computer.