In April 1964, NEC announced the N204A and N204B magnetic tape units together with the NEAC-2200. The N204A used 3/4 inch wide tape, and the N204B used 1/2 inch wide tape. Their tape drive system was the vacuum capstan type, and their tape shock absorber mechanism was the vacuum chamber type. These units used the NRZI recording system.
Both units came in a number of models with different tape running speeds.
They were also used with various models of the subsequent NEAC Series 2200.
| Model name | N204B -1,-2 | N204B -3,-4 | N204B -5 | N204A -3 | ||
|---|---|---|---|---|---|---|
| Magnetic tape | Width (mm) | 12.7 | 19.05 | |||
| Length (m) | 732 | - | ||||
| Number of tracks | 7 | 10 | ||||
| Tape running speed (inch/s) | 36 | 80 | 120 | 120 | ||
| Tape rewind speed (inch/s) | 108 | 240 | 360 | 360 | ||
| Start/stop time(msec) | 3 | 3 | 4 | - | ||
| Recording system | NRZI | - | ||||
| Information recording density (bit/mm) | 21.8 | 21.8 | ||||
| Information transfer speed (char/s) | 20k | 44k | 67k | 133k | ||
| Application | NEAC-2200 and NEAC Series 2200 | |||||
