The M-680 Processor Group E Model and M-660 Processor Group E Model were general-purpose processor groups with an advanced system architecture, and an expanded memory mechanism as standard equipment.
The M-680 Processor Group E Models achieved a performance range of about 4.5 times in terms of the instruction execution speed ratio, from the M-680/160E entry model to the M-680/420E 4-way processor model. Similarly, the M-660 Processor Group E Models achieved a performance range of about 4.5 times in terms of the instruction execution speed ratio, from the M-660/120E entry model to the M-660/280E 2-way processor model. This made it possible to select the optimal processor to suit the required processing capacity. It was also easy to implement field upgrades to higher-end models.
| 160E | 180E | 210E | 220E | 320E | 420E | |
|---|---|---|---|---|---|---|
| Number of instruction processors | 1 | 2 | 3 | 4 | ||
| Buffer memory capacity | 128KB | 256KB | 256KBx2 | 256KBx2 | 256KBx3 | 256KBx4 |
| Main memory capacity | 32-1,024MB | 64-1,024MB | 128-1,024MB | |||
| Number of channels | 16-64 | 32-64 | 32-128 | 48-128 | 64-128 | |
| Announcement date | April 1990 | |||||
| 120E | 140E | 160E | 180E | 260E | 280E | |
|---|---|---|---|---|---|---|
| Number of instruction processors | 1 | 2 | ||||
| Buffer memory capacity | 32KB | 64KB | 64KBx2 | |||
| Main memory capacity | 32-512MB | 64-512MB | ||||
| Number of channels | 8-32 | |||||
| Announcement date | April 1990 | |||||
