This series, employing Fujitsu's virtual memory system, was announced in August 1973 in competition to IBM's virtual storage system (announced in August 1972). The FACOM 230-8 Series was comprised of 5 models -- the FACOM 230-28S, 28, 38, 48 and 58 -- ranging from mid to large size, and it provided more comprehensive functionality and improved processing speed through innovations like employing a high-efficiency virtual memory system, using 1Kbit MOS IC memory, and connecting a newly developed magnetic disk unit for high capacity files (100Mbyte capacity per disk pack). Fujitsu provided a software-based virtual memory system (software paging system) in the FACOM 230-25 and 35 announced in 1968, and a hardware-based virtual memory system in the FACOM 230-45S and 55 announced in 1969, and thus they had an established basis for virtual memory systems. This allowed Fujitsu to announce a competing model just one year after IBM's announcement of their virtual storage system (370/158, 168) in August of 1972.
| Model name | 230-28S | 230-28 | 230-38 | 230-48 | 230-58 | |
|---|---|---|---|---|---|---|
| Size | Mid-size | Mid-size | Mid-size | Large | Large (capable of multi- processor operation with 2 CPUs) |
|
| Memory unit | Cycle time |
1.5µs/2B | 1.4µs/2B | 960ns/4B | 700ns/4B | 600ns/4B |
| Memory device |
(Magnetic core) | MOS IC memory (1Kbit/chip) | ||||
| Capacity | 16- 64KB |
32- 128KB |
96- 512KB |
128KB- 1MB |
128KB- 2MB |
|
| Check functions |
Parity check | ECC (1bit automatic error correction, 2bit automatic error detection) |
||||
| Operation speed |
Binary addition/ subtraction: (16bit) |
3.0µs | 2.8µs | 2.4µs | 1.4µs | 0.3µs (32bit) |
| Binary multi- plication (16bit) |
17.2µs | 16.1µs | 9.1µs | 6.3µs | 3.9µs | |
| Maximum number of channels |
6 | 6 | 10 | 10 | 32 | |
