DECtape

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PDP-11 with TU56 dual DECtape unit. Note the 6-armed "starfish" hubs holding circular white tape reels in place. Read/write heads are housed in the white vertical rectangles above the tape reels.

DECtape, originally called "Microtape", was a magnetic tape data storage medium used with many Digital Equipment Corporation computers, including the PDP-6, PDP-8, LINC-8, PDP-10, PDP-11, PDP-12, and the PDP-15. On DEC's 32-bit systems, VAX/VMS support for it was implemented but did not become an official part of the product lineup. DECtapes were 3/4 inch wide, and formatted into blocks of data that could each be read or written individually. Each tape stored 184K 12-bit PDP-8 words or 144K 18-bit words. Block size was 128 12-bit words (for the 12-bit machines), or 256 18-bit words for the other machines (16, 18, 32, or 36 bit systems). From a programming point of view, DECtape behaved like a very slow disk drive.

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TU56 DECtape Drive Information TU56 DECtape Drive Information www.pdp8.net/tu56/tu56.shtml - Web

DECtape Documentation DECtape Documentation bitsavers.org/pdf/dec/dectape - Web

VT103 manual VT103 manual www.bitsavers.org/.../EK-VT103-UG-001_VT103_User_Guide_Sep79.pdf - Web

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