|OS support (VMS):||VMS 3.0 to V4.7|
|Number of processors:||2|
|CPU technology:||Bipolar Schottky|
|CPU cycle time:||200ns|
|Instruction-buffer:||8 bytes |
|Translation-buffer:||128 entries |
|Control store:||4K 99-bit words |
|User Writable Control Store:||2K 99-bit words |
|Console processor:||LSI-11 |
|Console device:||RX01 |
|Physical address lines:||30|
|Memory checking:||8-bit ECC/longword |
|Max I/O throughput:||11MB/s|
The VAX-11/782 was an early asymmetric dual processor VAX; it had two KA780 CPUs connected to up to four MA780 multi-port memory units (up to 2 Mbytes of main memory each). All I/O peripherals were attached to the 'master' CPU.
VAX-11/782 Attached-processor System
The VAX-11/782 presented in the "VAX Hardware Handbook Volume 1 - 1986":
The VAX-11/782 attached-processor system is a tightly coupled, asymmetrical multiprocessor system based on a MA780 multiport shared memory. The system can provide up to 1.8 times the performance of the VAX-11/780 system. The VAX-11/782 consists of two VAX-11/780 processors and a 4-Mbyte MA780 shared main memory mounted between the VAX CPU cabinets. The main memory can be expanded to 8 Mbytes by adding a second MA780 multiport memory cabinet containing 4 Mbytes of memory. One VAX-11/780 CPU, designated the primary processor, contains 256 Kbytes of local ECC MOS memory for diagnostics programs, a shared memory interface, and a DW780 Unibus Adapter. All I/O devices and peripheral devices connect to the primary processor. The second CPU is designated the attached processor and contains 256 Kbytes of local memory for diagnostic testing and a shared memory interface. The attached processor does not support I/O devices.
The UNIBUS and MASSBUS adapters and the CI and DDI adapters available for the primary processor are the same as those used with the single VAX-11/780 processor system. The mass storage devices available for the primary processor are also the same as those used with the single VAX-11/780 processor system. The VAX-11/782 processor system cannot be connected to VAXcluster components. A UNIBUS expansion cabinet can be added to the VAX-11/782 system. The FP780 floating-point accelerator option can be added to each VAX-11/780 processor to decrease the execution time of the floating-point operations and some of the integer arithmetic operations.
- VAX Hardware Handbook Volume 1 - 1986 (VAX-11/782 on pdf pages 36ff)
|v • d • e VAX Computers and Operating Systems|
|VAX-11/7xx (including VAX 86x0) - VAX-11/780 • VAX-11/785 • VAX-11/750 • VAX-11/730 • VAX 8600 • VAX 8650|