Technical information

2.2.25 TU81–Plus Tape Drive
The TU81–Plus is a reel-to-reel tape drive mounted in a 101.6-cm (40-
in) cabinet. The drive supports two industry-standard recording methods:
group coded recording (GCR) and phase encoded (PE).
Storage Capacity
PE unformatted 45.3 Mbytes
PE formatted 40.0 Mbytes
GCR unformatted 177 Mbytes
GCR formatted 140 Mbytes
Functional Specifications
Recording media Magnetic tape
Tape dimensions 1.27 cm (0.5 in) wide, 731 m (2400 ft) long
Mode of operation Streaming
Recording methods Group code recording (GCR)
Phase encoded (PE)
Recording density 6250 bits/in (GCR)
1600 bits/in (PE)
Number of tracks 9
Ordering Information
TU81E–DA TU81–Plus tape drive, KLESI controller for 120 V
TU81E–DB TU81–Plus tape drive, KLESI controller for 240 V
Performance
Handling Bidirectional reel-to-reel
Tape velocity
High speed 190.5 cm/second (75 in/second)
Low speed 63.5 cm/second (25 in/second)
Channel data transfer rate
PE high speed 120 Kbytes/second
PE low speed 40 Kbytes/second
GCR high speed 469 Kbytes/second
GCR low speed 156 Kbytes/second
Rewind time (731.5 m (2400 ft) tape on
26.7 cm (10.5 in) reel)
2.75 minutes maximum
2–36 VAX 4000 Model 200 Technical Information