In October 1981, NEC announced the N7716 cartridge magnetic tape unit for OEM. It employed magnetic tape with a width of 1/4 inch and length of 450 feet, and was designed as a backup unit for small systems.
In October 1982, NEC announced the N7740 cartridge magnetic tape unit which doubled the number of tracks to 8.
| Model name | CT7716 | CT7740 | |||
|---|---|---|---|---|---|
| Number of tracks | 4 | 8 | |||
| Memory capacity (MB) | 16 | 40 | |||
| Recording system | MFM | ||||
| Recording density (BPI) | 7700 | ||||
| Tape speed (inch/s) | 90 | ||||
| Rewind time (s) | 60 | ||||
| Data transfer speed (kB/s)(per track) | 86.6 | ||||
| Save/restore time(min)(450feet) | 7 | 8 | |||
| External dimensions |
Depth (mm) | 430 | 300 | ||
| Height (mm)×Width (mm) | 117×220 | 117×220 | |||
