Hitachi announced the HITAC M-860 processor group of compact and mid-range mainframes in February 1992. This group featured low-power 12k-gate bipolar LSIs, 384 kbit RAM, and 18k-gate logic BiCMOS LSIs. The nine models covered a 13-fold performance range, with the top model using four processors.
System performance was enhanced with a 16 TB extension storage unit and with 18 MB per second optical channels and 9 MB per second metal channels for high-speed data transfers with peripheral devices.
The M-860 processor group provided diverse, flexible operation with such offerings as processor-distribution operation and virtual machine systems.
| 20,40 | 60 | 160 | 180 | 200,210 | 320 | 420 | |
|---|---|---|---|---|---|---|---|
| No. of instruction processors | 1 | 2 | 3 | 4 | |||
| Buffer memory capacity | 32KB | 64KB | 256KB(instruction: 128 KB, data: 128 KB) | ||||
| Main memory capacity [MB] | 32-512 | 64-512 | 64-1024 | 128-1024 | |||
| No. of channels | 8-32 | 16-64 | 32-128 | ||||
