72:(called Vicalloy) 1200 feet long. These metal tapes and reels were very heavy with a combined weight of 25lbs. Data was recorded in eight channels on the tape (six for the data value, one parity channel for error checking, and one timing channel) at a density of 128 bits per inch. The tape could be moved at 100 inches per second, giving a nominal transfer rate of 12,800 characters per second. Data were recorded in fixed size blocks of 60 words of 12 characters each. Making allowance for the empty space between tape blocks, the actual transfer rate was around 7,200 characters per second.
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preventing the recording head from quickly wearing out. The metal tapes also were dirty, and a slowly renewed felt wiper collected tape debris. The UNISERVO I had a high-speed rewind capability, and multiple drives on the UNIVAC I could rewind while others continued with data processing reads or writes.
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applications. The data transfers to/from the UNIVAC I processor were fully buffered in a single block dedicated memory, permitting instruction execution in parallel with tape movement and data transfer. The internal serial data path permitted inserting a tape data block into main memory in one
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buffer. The tape drive contained a permanent leader, and each tape reel had a connector link to the leader. The nickel-plated phosphor bronze tapes were very abrasive, and to counter this problem a thin plastic wear tape was slowly moved over the recording head, between the head and the tape,
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base/ferric oxide media tapes that became the industry standard. While UNIVAC was first with computer tape, and had higher performance than contemporary IBM tape drives, IBM was able to set the data interchange standard. UNIVAC was later forced to be compatible with the IBM technology.
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series tape drives which set the industry standard for data interchange. Ironically, IBM then later switched to phase encoding in its 1600-bit-per-inch tape generation because of its superior data reliability.
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123:. Supply and take-up reel motion was buffered via a complex pulley-string-spring arrangement, as the design was prior to the invention of the
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102:) for later computers in their product line. The UNISERVO II could read metal tapes from the UNIVAC I as well as use higher density
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139:-base magnetic tape. Both continued the use of single capstan drives and were vacuum column designs. The IIIC and later tapes used
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The UNISERVO supported both forward and backward modes on read or write operation. This offered significant advantages in data
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239:"UNIVAC PERIPHERAL EQUIPMENT FOR USE WITH THE UNIVAC SCIENTIFIC, MODEL 1103A - THE UNISERVO".
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and IIIA omitted the plastic wear tape and felt wipers, since they were primarily used with
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continued to use the name UNISERVO for later models of tape drive (e.g.,
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183:"Tracking the history of magnetic tape: A game of noughts and crosses"
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UNIVAC computer with a row of UNISERVO tape drives on the right
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The tape motion in the UNISERVO I was controlled by a single
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203:. American Federation of Information Processing Societies.
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242:univac :: 1103 :: 1103A prelimInfo Dec55
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198:"The Uniservo - Tape Reader and Recorder"
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713:Computer-related introductions in 1951
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64:-inch-wide (13 mm) thin strip of
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196:Welsh, H. F. & Lukoff, H (1952).
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143:encoding to be compatible with the
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51:for a commercially sold computer.
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54:The UNISERVO used metal tape: a
476:"Eighth" (0.15) inch (3.81 mm)
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489:KC standard, Compact Cassette
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158:History of computing hardware
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47:computer. It was the first
39:tape drive was the primary
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575:Three quarter inch (19 mm)
501:Tarbell Cassette Interface
285:Magnetic-tape data storage
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635:Eight millimeter (8 mm)
418:Eight millimeter (8 mm)
163:List of UNIVAC products
708:UNIVAC storage devices
536:Exatron Stringy Floppy
447:Quarter inch (6.35 mm)
216:Cite journal requires
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529:Stringy (1.58–1.9 mm)
245:. Dec 1955. pp.
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600:Half inch (12.7 mm)
554:Rotronics Wafadrive
507:Commodore Datasette
335:Half inch (12.7 mm)
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300:Wide (19–25.4 mm)
121:synchronous motor
111:Technical details
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96:UNISERVO IIIC
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133:UNISERVO IIA
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431:IBM 3570 MP
396:LTO Ultrium
348:IBM 7-track
249:-2 (42-43).
92:UNISERVO II
697:Categories
513:DECtape II
169:References
131:The later
49:tape drive
402:IBM 3592
378:IBM 3590
366:IBM 3480
342:UNISERVO
313:LINCtape
307:IBM 7340
152:See also
137:PET film
104:PET film
68:-plated
45:UNIVAC I
37:UNISERVO
18:UNISERVO
677:DDS/DAT
648:Mammoth
568:Helical
360:9-track
325:CDC 626
319:DECtape
287:formats
145:IBM 729
117:capstan
81:merging
77:sorting
59:⁄
679:(1989)
662:(1999)
656:(1996)
650:(1994)
644:(1987)
627:(2003)
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615:(1995)
609:(1992)
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588:Ampex
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538:(1979)
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485:(1971)
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427:(1995)
425:Travan
410:(2006)
408:T10000
404:(2003)
398:(2000)
392:(2000)
386:(1998)
380:(1995)
374:(1984)
368:(1984)
362:(1964)
356:(1958)
350:(1952)
344:(1951)
327:(1966)
321:(1963)
315:(1962)
309:(1961)
293:Linear
88:UNIVAC
66:nickel
642:Data8
607:ArVid
581:Sony
495:DC100
483:D/CAS
466:Ditto
390:T9940
384:T9840
201:(PDF)
625:SAIT
222:help
141:NRZI
79:and
35:The
660:VXA
654:AIT
619:DTF
590:DST
583:DIR
460:SLR
454:QIC
437:ADR
372:DLT
41:I/O
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211:}}
207:{{
98:,
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