AT&T 3B2/300 Technical Reference Manual page 541

FUNCTIONAL D E S C R I P T I O N - - - - - - - - - - - - - - - - - - - - - - - - - -
23-Megabyte Cartridge Tape Drive
Figure 3-90 is a functional block diagram of a 23-megabyte cartridge tape drive. The cartridge tape
drive is a floppy disk-like device, using an SA-450 interface. The cartridge tape drive circuits include
the following:
• Index Detector/Generator
• Write Current Driver
• Read Amplifier and Transition Detector
• Write Protection Logic
• Logical Drive/Stream Selection
• Tape Speed/Capstan Control
• End-of-Tape/Beginning-of-Tape (EOT /BOT) Monitor
• Door Lock Solenoid (not used on all versions).
The cartridge tape drive circuits combine to do the following:
• Decode, generate, and emulate floppy disk drive type control signals
• Position the read/write head to the selected stream
• Monitor and control tape speed
• Read/write data from/to the media.
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