Difference between revisions of "DECtape II"
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| − | [[Image:dtii.jpg| | + | [[Image:dtii.jpg|250px|thumb|right|A DECtape II cartridge]]. |
| − | + | '''DECtape II''' was a low-cost, low-performance [[random access]] [[magnetic tape]] [[secondary storage]] system, proprietary to [[Digital Equipment Corporation|DEC]]. They were effectively a successor to the earlier [[DECtape]]. | |
| − | [[Category: | + | They were primarily intended for [[bootstrap|booting]] and software distribution (although they could be used for [[mass storage]]), so in some sense they were an early alterative to [[floppy disk]]s. |
| − | + | ||
| + | It used a DC-100A cartridge from 3M, containing 140' of .015" wide tape, on which data was written at 800 [[bit]]s per inch. The tapes were pre-formatted by DEC to hold 2048 records of 128 [[byte]]s each, in two tracks; thus a cartridge could hold 256KB in total. The drive always read and wrote blocks of 4 records, giving the standard 512 byte blocks of DEC mass storage devices. | ||
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| + | The only DECtape II drive was the [[TU58 DECtape II]]. | ||
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| + | ==External links== | ||
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| + | * [http://www.bitsavers.org/pdf/dec/dectape/tu58/TU58_Engineering_Specification_Jun78.pdf TU58 Engineering Specification] | ||
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| + | [[Category: Magnetic Tape]] | ||
Latest revision as of 15:04, 30 May 2022
DECtape II was a low-cost, low-performance random access magnetic tape secondary storage system, proprietary to DEC. They were effectively a successor to the earlier DECtape.
They were primarily intended for booting and software distribution (although they could be used for mass storage), so in some sense they were an early alterative to floppy disks.
It used a DC-100A cartridge from 3M, containing 140' of .015" wide tape, on which data was written at 800 bits per inch. The tapes were pre-formatted by DEC to hold 2048 records of 128 bytes each, in two tracks; thus a cartridge could hold 256KB in total. The drive always read and wrote blocks of 4 records, giving the standard 512 byte blocks of DEC mass storage devices.
The only DECtape II drive was the TU58 DECtape II.
