TU81 Streaming Tape Unit: Difference between revisions
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[[Image:tu81.jpg|thumb|right|200px|A TU81]] | [[Image:tu81.jpg|thumb|right|200px|A TU81]] | ||
The '''TU81 Streaming Tape Unit'' is a large 9-track [[magnetic tape drive]] for heavy backup duties. | The '''TU81 Streaming Tape Unit''' is a large 9-track [[magnetic tape drive]] for heavy backup duties. | ||
The TU81 servo/control module uses a [[Motorola]] [[MC6802|6802]] processor, a variant of the [[MC6800|6800]] with 128 bytes of internal [[Random Access Memory|RAM]] and an internal clock oscillator. There is also a [[6821 PIA|6821]] [[Parallel Interface Adapter]] [[integrated circuit|chip]] used for communication between the Servo/Control [[microprocessor]] and the Formatter Write microprocessor (on a different board). | The TU81 servo/control module uses a [[Motorola]] [[MC6802|6802]] processor, a variant of the [[MC6800|6800]] with 128 bytes of internal [[Random Access Memory|RAM]] and an internal clock oscillator. There is also a [[6821 PIA|6821]] [[Parallel Interface Adapter]] [[integrated circuit|chip]] used for communication between the Servo/Control [[microprocessor]] and the Formatter Write microprocessor (on a different board). | ||
Revision as of 02:00, 9 January 2024
| TU81 Streaming Tape Unit | |
| Manufacturer: | Digital Equipment Corporation |
|---|---|
| Media: | standard half-inch tape |
| Tape density: | 1600 bpi (PE), 6250 bpi (GCR) |
| Tape speed: | 75 inch/sec (high speed streaming mode) or 25 inch/sec (start/stop mode or low-speed streaming mode) |
| Year Introduced: | 1984/1985 |
The TU81 Streaming Tape Unit is a large 9-track magnetic tape drive for heavy backup duties.
The TU81 servo/control module uses a Motorola 6802 processor, a variant of the 6800 with 128 bytes of internal RAM and an internal clock oscillator. There is also a 6821 Parallel Interface Adapter chip used for communication between the Servo/Control microprocessor and the Formatter Write microprocessor (on a different board).
Two 6840 Programmable Counter / Programmable Timer Module chips are used to count servo tachs.
The firmware is stored in two ROM chips.
