Product Details

TU81/TA81 Tape Drives - *The TU81 and TA81 are dual speed, 9-track, ANSI standard 1/2 inchmagnetic tape subsystems.*
Standard Models ---------------------------------------------------------------------------- Features Description Capacity PE mode (1600 BPI) - 40 MB with 10.5 inch reel 2400 feet of tape. GCR mode (6250 BPI) - 140 MB with 10.5 inch reel Reel Capacity 10.5 inches - 2400 feet (732 meters) *1* Supported Media 5", 7", 10.5" reels *1* Data Transfer Rate PE low speed mode - 40 Kb/s PE high speed mode - 140 Kb/s GCR low speed mode - 156 Kb/s GCR high speed mode - 469 Kb/s Nominal Rewind Time 2 1/2 minutes Rewind Speed 192 in/s Maximum Load/Unload 15 seconds Time Tape Width .5 inch (12.65 mm) Tape Thickness 38.1 microns (1.5 mil) Data Reliability Recoverable write error PE - 1 in 10 bits Recoverable write error GCR - 1 in 10 bits Recoverable read-forward PE and GCR - 1 in 10 bits Unrecoverable read error PE - 1 in 10 bits Unrecoverable read error GCR - 1 in 10 bits Unrecoverable write error - not allowed Nominal Tape Speed Low speed start/stop - 25 in/s (63.5 cm/s) Low speed streaming - 25 in/s (63.5 cm/s) High speed streaming - 75 in/s 190.5 cm/s) Data Format/Recording PE 9-track, phase-encoded recording, 1600 bits/inch GCR 9-track group-coded recording, 6250 bits/inch *Note 1: *Back coated tapes are not supported and they cause errors, load problems, and deposit extra oxide in the tape path. These are also known as Blackwatch tapes. Description =========== The tape transport for the TU81 and TA81 is horizontally mounted. The transport is packaged with its formatter, interface controller, and 874 power controller in a 40 inch high H9643 standard cabinet. The transport writes and reads in two formats. One format uses phase-encoded (PE), 9-track, 1600 bits/in data recording, which is compatible with ANSI standards. The other format uses group-encoded recording (GCR), 9-track, 6250 bits/in data recording. GCR is a coding method that uses nonreturn-to-zero, inverted (NRZI) recording, but provides a much higher recording density and transfer rate than NRZI recording. The transport operates in either conventional start/stop or streaming modes. The mode is automatically selected by the adaptive speed control system. The transport has three speeds, low speed start/stop, low speed streaming, and high speed streaming. Data transfer rates are from 40 Kbytes/sec to 469 Kbytes/sec, depending on the speed mode and density. The transport does not have a capstan, tension arms, or vacuum columns. Instead it uses a microprocessor-controlled servo that directly controls the reel motors to maintain constant tape speed and tension. Features ======== The transport has the following basic features: Tape path is short Tape path has no moving parts or capstan Tape contacts only the tape cleaner and the magnetic head Transport has air bearings and a solid-state tape tension sensor Microprocessors control all major operating functions Built-in power-on diagnostics are automatically initiated at power on Resident diagnostics can be manually initiated from the front panel Transport has resident adaptive speed control Transport has no mechanical adjustments Transport requires no scheduled preventative maintenance Transport has a long-life magnetic head Transport has on-the-fly 1-track (PE), or 2-track (GCR) error correction Special Features ================ The transport features an ASCII diagnostic port that allows qualified personnel to conduct complex TU81/TA81 troubleshooting and testing with any RS232C-compatable terminal. A special hand-held terminal is available for this purpose. The TA81 has two special switches/indicators on the control panel: PORT A and PORT B (one for each interface channel). These switches/indicators control the TA81 to HSC data interchange. ----------------------------------------------------------------------------
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