TU81 Streaming Tape Unit: Difference between revisions
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The [[firmware]] is stored in two [[read-only memory|ROM]] chips. | The [[firmware]] is stored in two [[read-only memory|ROM]] chips. | ||
==External links== | |||
* [http://www.bitsavers.org/pdf/dec/magtape/tu81/EK-TUA81-TM_002_Nov85.pdf EK-TUA81-TM_002 TU81/TA81 Technical Manual] | |||
[[Category: DEC Tape Drives]] | [[Category: DEC Tape Drives]] | ||
Revision as of 16:34, 23 August 2021
| 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 |
Big 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.
