CASSETTE_INTERFACE_WITH_ACIA

Published:2009/7/14 7:31:00 Author:May | From:SeekIC

Permits use of audio pickup for mass storage in Motorola 6800 microcomputer system. Uses Motorola MC6850 asynchronous communication interface adapter (ACIA), which is specialized version of UART. All control, status, and data transfers in ACIA are made over single 8-bit bidirectional bus. Request-to-send line (RTS) controls tape recorder motor. When RTS is set high, input to IC8 is high and relay coil is not energized. IC6 gives 5-s delay following motor turn-on so long leader will be recorded at mark frequency. IC7 gives delay so reading starts 2.5 s before first data byte. Article covers circuit operation in detail and gives operating subroutines.-J. Hemenway. The Compleat Tape Cassette Interface, BYTE, March 1976, p 10-16.



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