DIGITAL EQUIPMENT VAX 11/780

vax 11/780

Digital Equipment has introduced the new VAX-11/780 computer system. The cost ranges from $120,000 to $160,000 depending on the options.

The VAX-11/780 is 32-bit system with a complex instruction set computer (CISC) architecture based on DEC’s earlier PDP-11. This machine was designed to compete with the IBM System 360 with a much lower cost of ownership.

The CPU is made from TTL logic running at 5 MHz. The VAX-11/780 supports 128KB to 8MB of memory (2MB initially) through one or two memory controllers. Each memory controller supports 128KB to 4MB of memory.

The VAX-11/780 also supports Computer Interconnect (CI), a proprietary network to attach disk drives and potentially share them with other VAX computers.

VAX (“virtual address extension“) was designed to extend or replace DEC’s various Programmed Data Processor (PDP) ISAs. The VAX architecture’s primary features were virtual addressing (for example demand paged virtual memory) and its orthogonal instruction set.