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Topic: DECtape


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In the News (Fri 22 Mar 19)

  
  DECtape - Education - Information - Educational Resources - Encyclopedia - Music
DECtapes were 3/4 inch wide and formatted into blocks of data that could be read or written individually.
DECtape was controversial for its amazing similarity to LINCtape, which was originally designed by Wesley Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
DECtape II was introduced around 1979 and had a similar block structure, but on a cartridge tape.
www.music.us /education/D/DECtape.htm   (491 words)

  
  php-deluxe.net - description DECtape
DECtape was a magnetic tape storage medium used with early Digital Equipment Corporation computers, including the PDP-6, PDP-8, LINC, PDP-10, PDP-11, PDP-12, and the PDP-15.
DECtapes were 3/4 inch wide and formatted into blocks of data that could be read or written individually.
DECtape was controversial for its amazing similarity to LINCtape, which was originally designed by Wesley A. Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
www.php-deluxe.net /encyclopedia,index.page,DECtape.htm   (309 words)

  
  DECtape
DECtapes were 3/4 inch wide and formatted into blocks of data that could be read or written individually.
DECtape was controversial for its amazing similarity to LINCtape, which was originally designed by Wesley Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
DECtape II was introduced around 1979 and had a similar block structure, but on a cartridge tape.
pedia.newsfilter.co.uk /wikipedia/d/de/dectape.html   (288 words)

  
 Spartanburg SC | GoUpstate.com | Spartanburg Herald-Journal
DECtape had its origin in the LINCtape tape system, which was originally designed by Wesley Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
DECtape used the same transport mechanism as LINCtape, but the tape was run in the opposite direction, thus the supply and takeup reels were reversed.
DECtape II DECtape II was introduced around 1979 and had a similar block structure, but on a special, pre-formatted DC150 miniature cartridge tape.
www.goupstate.com /apps/pbcs.dll/section?category=NEWS&template=wiki&text=LINCtape   (695 words)

  
 Reference.com/Encyclopedia/DECtape
DECtape had its origin in the LINCtape tape system, which was originally designed by Wesley Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
DECtape used the same transport mechanism as LINCtape, but the tape was run in the opposite direction, thus the supply and takeup reels were reversed.
DECtape II DECtape II was introduced around 1979 and had a similar block structure, but on a special, pre-formatted DC150 miniature cartridge tape.
www.reference.com /browse/wiki/DECtape   (735 words)

  
 In search of... DECtape drives
DECtape has nothing to do with DEC's "TK" technology, and, therefore, nothing with DLT.
You'd need a DECtape TU55/56 to read those (assuming they're DECtape II tapes), or a TU58 if they are of that kind.
Usually, when people are referring to DECtape, they meen the small 256KB block-addresseable reel tapes "as seen on TV" and in the pictures, and those are TU55/56.
www.classiccmp.org /pipermail/cctech/2004-October/034936.html   (217 words)

  
 Jargon File 3.0.0 - microtape   (Site not responding. Last check: )
Occasionally used to mean a DECtape, as opposed to a macrotape.
Unlike those for today's macrotapes, microtape drivers allowed random access to the data, and therefore could be used to support file systems and even for swapping (this was generally done purely for hack value, as they were far too slow for practical use).
Apparently the term `microtape' was actually the official term used within DEC for these tapes until someone coined the word `DECtape', which, of course, sounded sexier to the marketroids; another version of the story holds that someone discovered a conflict with another company's `microtape' trademark.
www.clueless.com /jargon3.0.0/microtape.html   (148 words)

  
 DECtape at AllExperts
DECtape and DECtape II DECtape was controversial for its amazing similarity to LINCtape, which was originally designed by Wesley Clark at the MIT Lincoln Laboratory as an integral part of the LINC computer.
DECtape II was introduced around 1979 and had a similar block structure, but on a special, pre-formatted DC150 miniature cartridge tape.
The TU58 DECtape II drive had an RS232 serial interface, allowing it to be used with the ordinary serial ports that were very common on Digital's contemporary processors.
en.allexperts.com /e/d/de/dectape.htm   (477 words)

  
 dectape - definition by dict.die.net
DECtape A reel of magnetic tape about 4 inches in diameter and one inch wide.
Unlike today's macrotapes, microtape drivers allowed random access to the data, and therefore could be used to support file systems and even for swapping (this was generally done purely for hack value, as they were far too slow for practical use).
In their heyday DECtapes were used in pretty much the same ways one would now use a floppy disk: as a small, portable way to save and transport files and programs.
dict.die.net /dectape   (97 words)

  
 Expert About de:DECtape
Occasionally used to mean a DECtape, as opposed to a {macrotape}.
A DECtape is a small reel, about 4 inches in diameter, of magnetic tape about an inch wide.
Apparently the term "microtape" was actually the official term used within DEC for these tapes until someone coined the word "DECtape", which, of course, sounded sexier to the marketroids.
www.expertsite.biz /dir/de/DECtape.htm   (1423 words)

  
 [No title]
Since the software is supplied on a system DECtape (or LINCtape), it is not necessary to build an initial system, as it is when using cassettes or paper tapes.
Mount the system DECtape (AL-4711C-BA) on unit 0 (this appears as unit 8 on some DECtape units), making certain to wind at least 10 feet of tape onto the empty reel.
In block 0 of the DECtape is a larger bootstrap.
www.dbit.com /pub/pdp8/doc/os8sysgn.doc   (5698 words)

  
 [No title]
Provided that the interface between the operating system and IMP programs is not changed, the operating system may be modified (that is a new core image written) without changes being required to the rest of the system tape.
Lack of space for input/output buffers and lack of blocks for a Dectape output file are treated as catastrophic errors and cause an immediate CAL to the Supervisor and thence back to the Executive.
Device handlers for the system storage device (Dectape in the standard system) and for the user console are built into the Supervisor, while device handlers for other devices are incorporated into file-processors so that they are not a permanent overhead on the system.
history.dcs.ed.ac.uk /archive/languages/imp15-tmp/IMP15SYS.TXT   (3309 words)

  
 TU56 DECtape Drive Information
The DECtape drive served the purpose of a floppy disk drive on modern machines.
The main difference between the DECtape and a floppy is that the DECtape had a much longer seek time since the tape has to be sequentially read.
The DECtape is derived from the LINCtape on the LINC-8
www.pdp8.net /tu56/tu56.shtml   (815 words)

  
 jargon, node: microtape
Unlike those for today's macrotapes, microtape drivers allowed random access to the data, and therefore could be used to support file systems and even for swapping (this was generally done purely for hack value, as they were far too slow for practical use).
In their heyday they were used in pretty much the same ways one would now use a floppy disk: as a small, portable way to save and transport files and programs.
Apparently the term `microtape' was actually the official term used within DEC for these tapes until someone coined the word `DECtape', which, of course, sounded sexier to the marketroids; another version of the story holds that someone discovered a conflict with another company's `microtape' trademark.
www.jargon.net /jargonfile/m/microtape.html   (151 words)

  
 DECtape - OneLook Dictionary Search
We found 4 dictionaries with English definitions that include the word DECtape:
Tip: Click on the first link on a line below to go directly to a page where "DECtape" is defined.
DECtape : Free On-line Dictionary of Computing [home, info]
www.onelook.com /cgi-bin/cgiwrap/bware/dofind.cgi?word=DECtape   (77 words)

  
 DECtape from FOLDOC
Unlike today's macrotapes, microtape drivers allowed random access to the data, and therefore could be used to support file systems and even for swapping (this was generally done purely for hack value, as they were far too slow for practical use).
In their heyday DECtapes were used in pretty much the same ways one would now use a floppy disk: as a small, portable way to save and transport files and programs.
Nearby terms: decryption « DECstation « DECT « DECtape » DECUS » Decus cpp » DEC Wars
foldoc.org /?DECtape   (105 words)

  
 [No title]
The later TC01 DECtape controller, which uses 3-cycle DMA, is not compatible with the single-cycle type 555 DECtape, although the tape format is the same.
DECtape is 18-bit oriented, and can transfer while moving backwards as well.
It is known for being somewhat clumsy to use, and used a structure not translatable to newer peripherals (since it requires 129 words/block devices).
www.ibiblio.org /pub/academic/computer-science/history/pdp-8/docs/WHAT-IS-A-PDP8   (9356 words)

  
 [No title]
The later TC01 DECtape controller, which uses 3-cycle DMA, is not compatible with the single-cycle type 555 DECtape, although the tape format is the same.
It is known for being somewhat clumsy to use, and used a structure not translatable to newer peripherals (since it requires 129 words/block devices).
The original concepts mostly still apply: to run on the minimum system of a single DECtape or other mass storage device, a 4K PDP-8 CPU, and a console device which is at least a Teletype.
www.cs.carleton.edu /pdp/WHAT-IS-A-PDP8   (9356 words)

  
 De
User:AtlantAtlant 17:19, 9 Dec 2004 (UTC) The KI10 diagnostics were supplied on DECtape; I suspect that DEC would not offer service on a KI10 without DECtape, just as they later required that KL10 systems have an RP06 to be on service.
Early KL10 diagnostics were also on DECtape, but they were supplanted by the KLAD pack.
DECtape was not available until well after the introduction of the PDP-1, but was made available as an option for it.
www.gateserver.net /Topicdetails.aspx?Topicid=18940&name=&catid=111&topicname=DECtape   (657 words)

  
 DECtape: Computer Book: DECtape: Definitions DECtape Glossary & DECtape Terminology
DECtape: Read about your DECtape computer abbreviation, computer definition or term.
Unlike today's macrotapes,microtape drivers allowed random access to the data, andtherefore could be used to support file systems and even forswapping (this was generally done purely for hack value,as they were far too slow for practical use).
In their heyday DECtapes were used in pretty much the sameways one would now use a floppy disk: as a small, portableway to save and transport files and programs.
www.the-computer-book.com /DECtape-computer-pc-terms-tips.html   (122 words)

  
 [No title]   (Site not responding. Last check: )
This is a tar archive derived from a DECtape labelled "nsys"; a couple of years ago Keith Bostic and Paul Vixie attached a DECtape drive to a VAX and transcribed some tapes that we were storing.
In consequence, during 1969-73, the epoch was changed several times, usually by back-dating existing files on disk and tape and changing the origin.
The OS here implements the present standard of a New Year 1970 epoch and a resolution of 1 second, but the DECtape on which it is stored uses the older interval and some older epoch.
www.tuhs.org /Archive/PDP-11/Distributions/research/Dennis_v3/Readme.nsys   (677 words)

  
 MULTOS/8 Operating System
During DECtape transfers, program execution will continue and all devices will continue to be serviced, but a noticeable slowdown in system operation occurs.
In fact, the most noticeable event during a DECtape transfer is that the line printer continues to print, but at a slower rate.
While it is perfectly permissible to print spool a DECTape file, it is advised that the file first be transferred to a high speed device (such as SYS: or RKA1) and then spooled from that device.
highgate.comm.sfu.ca /~djg/htdocs/os/multos8/index.shtml   (4842 words)

  
 V4/usr/man/man8/bproc.8
The DECtape version of this program is called.it tboot, the magtape version.it mboot.
If.it tboot or.it mboot is read into location zero and executed there, it will type `=' on the console, read in a.it tp entry name, load that entry into core, and transfer to zero.
If no suitable ROM is available, magtape and DECtape programs are presented below which may be manually placed in core and executed.
minnie.tuhs.org /UnixTree/V4/usr/man/man8/bproc.8.html   (753 words)

  
 tp.1   (Site not responding. Last check: )
Both DECtape and magtape archives can be read from and written to a file.
The tp format has severe limitations: the maximum path name length is 32 bytes; only regular files of non-zero length can be archived; the maximum user and group ID is 255, higher IDs are truncated.
DECtape archives can hold up to 192 entries and have a maximum size of 289 kbytes; magtape archives can hold up to 496 entries and have a maximum size of 16 Mbytes.
omnibus.ruf.uni-freiburg.de /~gritter/man/tp.html   (632 words)

  
 PDP-4/X
This turned out to me much harder than it first appeared to be, because the bootstrap is also used by the system as a disk handler, so a large number of absolute addresses need to be preserved, and it has to fit in locations 77637 through 77777.
A new 32K DECtape image was generated by runing SGEN under Bob Supnik's SIMH PDP-9/PDP-15 emulator.
The system library file was extracted from this DECtape image, and a new system library file, containing the new DTA handler, was generated using a cross assembler and library editor.
homepage.mac.com /dgcx/pdp4x   (1874 words)

  
 DECtape Computer Encyclopedia Enterprise Resource Directory Complete Guide to Internet   (Site not responding. Last check: )
DECtape Computer Encyclopedia Enterprise Resource Directory Complete Guide to Internet
Unlike today's {macrotapes}, microtape drivers allowed {random access} to the data, and therefore could be used to support {file systems} and even for {swapping} (this was generally done purely for {hack value}, as they were far too slow for practical use).
In their heyday DECtapes were used in pretty much the same ways one would now use a {floppy disk}: as a small, portable way to save and transport files and programs.
www.jaysir.com /computer-encyclopedia/d/dectape-computer-terms.htm   (106 words)

  
 Paul Holbrook's weblog: One of my first systems - the PDP-8/E   (Site not responding. Last check: )
The item from Slashdot about old computers reminds me of one of the first systems I was ever around: a PDP-8/E running OS/8 off a DECtape.
The OS and all the applications were stored on the DECtape, which was this little (4") tape that had a file system stored on, much like a floppy disk.
What I remember about it was hitting control-c to interupt whatever program was running, and then waiting for the tape to rewind back to the beginning to reload the command prompt.
weblog.bluepenguin.us /archives/2002/04/11/one_of_my_first_systems_the_pdp8e.html   (115 words)

  
 OpenVMS Freeware (VS0185)
DECtape was a random-access tape storage device that used a 3/4" tape to emulate a disk.
The concept of DECtape originated at the M.I.T Lincoln Laboratory and was originally called LincTape.
Nowadays, like the steam locomotive, DECtape is hopelessly overpriced and underpowered (I've seen Postcript preambles that would overflow the tape), but it's still a blast to watch it run.
www.decus.org /libcatalog/document_html/vs0185_41.html   (171 words)

  
 Doug Jones's data formats for device emulation
Emulated DECtapes are represented as binary files, beginning with the text 'DECtape\n' in the first 8 characters.
When a DECtape is read (in the forward direction) into a 12 bit word, the data from 4 lines on tape are read into consecutive 3-bit nibbles as follows:
By convention, however, data blocks are always an even number of 18-bit words in length, and each data block is delimited by 10 18-bit words (5 at each end).
www.cs.uiowa.edu /~jones/pdp8/formats   (1331 words)

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