The OKITAC-5099(T2) was completed in May 1961 as a magnetic tape unit to connect with the OKITAC5090C and D Series.
The 5099T3 and T4, which were developed in 1962 for the OKITAC5090M, were completed with specifications compatible with IBM magnetic tape. A max.imum of 4 magnetic tape channels could be connected to a 5090M, and a max.imum of 10 magnetic tape units could be connected to each channel. Each data channel could operate independently, and thus it was possible to conduct reading and writing simultaneously.
| 5099(T2) | 5099(T3) | 5099(T4) | |
|---|---|---|---|
| Tape speed | 75inch/s | 75inch/s | 112.5inch/s |
| Recording density | 556bit/inch | 556bit/inch | 556bit/inch |
| Tape rewind speed | 150inch/s | - | - |
| Tape used | Width 1/2inch | Width 1/2inch | Width 1/2inch |
| Number of tracks | 7 | 7 | 7 |
| Reel diameter | 10.5 inch | 10.5 inch | 10.5 inch |
| Reel hub | IBM or NARTB type | IBM | IBM |
| Tape length | 2400feet | 2400feet | 2400feet |
| Tape startup time | 2.5ms max.. | 3ms max.. | 3ms max.. |
| Tape stopping time | 1.5ms max.. | 1.5ms max.. | 1.5ms max.. |
| Information transfer speed | 41.7Kchar/s | 41.7Kchar/s | 62.5Kchar/s |
| Tape end detection | Reflective type or short circuit type, using conductive foil | Reflective type or short circuit type, using conductive foil | Reflective type or short circuit type, using conductive foil |
| External dimensions | W560×D680×H1860mm | - | - |
| Power supply | AC100V 50c/s or 60c/s | - | - |
