TU81 Streaming Tape Unit: Difference between revisions
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{{Infobox Tape drive | {{Infobox Tape drive | ||
| name = TU81 Streaming Tape Unit | | name = TU81 Streaming Tape Unit | ||
| image = tu81.jpg | |||
| imgwidth = 150px | |||
| caption = A TU81 | |||
| tape speed = 75 inch/sec (high speed streaming mode) or 25 inch/sec (start/stop mode or low-speed streaming mode) | | tape speed = 75 inch/sec (high speed streaming mode) or 25 inch/sec (start/stop mode or low-speed streaming mode) | ||
| media = standard half-inch tape | | media = standard half-inch tape | ||
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| year introduced = 1984/1985 | | year introduced = 1984/1985 | ||
}} | }} | ||
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. | ||
Revision as of 15:12, 8 February 2024
| TU81 Streaming Tape Unit | |
 A TU81 | |
| 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.
