The NEAC Series 2200 was marketed in April 1971, and these models were marketed in October of the same year as high-end versions of the Model 75, 175 and 275, which were the online family of the series. They had online performance superior to the above 3 models. At the time, there was a marked shift from batch processing to online systems, and the Model 375 and 575 were large computers developed in response to these needs, for tasks such as online/real-time systems, database systems and time sharing systems.
A front-end processor -- a new peripheral device specially designed for communication processing -- was provided, and by adding this to the Model 375 or 575, it was possible to configure an online system with efficiency by 20 to 30 percent better than conventional machines. Newly developed high-speed (0.65 microseconds) core memory was used for the main memory in the computer main unit.
| 75 | 175 | 275 | 375 | 575 | |
|---|---|---|---|---|---|
| Announcement date | April 1971 | October 1971 | |||
| Main memory capacity (char.) | Max. 32K | Max. 65K | Max. 262K | Max. 393K | Max. 1,048K |
| Cycle time | 2µs/char. | 2µs/char. | 1.5µs/char. | 1.5µs/8char. | 0.65µs/8char. |
| Number of input/ output channels |
4 | General purpose: 3 For commu- nication: 1-32 |
General purpose: 4-7 For commu- nication: 1-32 |
8-16 | 16-20 |
| Memory element | Core memory | ||||
