Dual RK07 Disk-Based VAX-11/780 System Configuration

This document, effective January 1981, details the configuration and expansion capabilities of the Digital VAX-11/780 packaged system, specifically a dual RK07 disk-based setup.

The base configuration includes:

• 512K bytes of ECC MOS memory (expandable to 4MB within the CPU cabinet).
• An RK711 UNIBUS controller with two RK07 cartridge disk drives (total 56MB storage).
• An LA120 DECwriter III console terminal.
• A DZ11-A asynchronous multiplexer for 8 EIA communication lines.
• The CPU cabinet contains a UNIBUS Mounting Frame with space for options, limited by initial power and bus loads (17 bus loads available).

For expansion beyond the base limits, the document describes:

• Memory: Further expansion beyond 4MB, up to 8MB local memory (with a CPU Expansion Cabinet) or up to a maximum of 12MB with shared MA780 Multiport Memory options.
• UNIBUS Options: An add-on UNIBUS Options Cabinet (H9602-DF(DH)) can be ordered for additional mounting space for UNIBUS options, multiple BA11-K mounting boxes, and up to three more DZ11 distribution panels.
• System Upgrade Option (H9604-BA(BB)): This significant upgrade involves relocating existing UNIBUS options to a new UNIBUS Expansion Cabinet, which frees up space in the main CPU cabinet. A dedicated CPU Expansion Cabinet (H9602-HA(HB)) can then be added, providing further option panel spaces for additional memory, I/O adapters, and the DR780 interface.
• I/O Adapters: The upgraded system supports up to four UNIBUS Adapters (UBAs) and four MASSBUS Adapters (MBAs) for high-performance devices (like RM/RP disks, TE/TU tape drives).
• DR780 Interface: A high-performance channel for custom devices (one per system, incompatible with MA780 Multiport Memory).
• Asynchronous Lines: The ability to support up to 48 asynchronous lines using various DZ11 multiplexer combinations and distribution panels, often requiring external cabinets.

The document also provides key technical specifications such as available power (+5V) and bus loads for various configurations (e.g., the upgraded system has 34.5 Amps @+5V and 17 bus loads). It emphasizes that certain expansion components (like backplanes and distribution panels) are often not included with expansion cabinets and must be ordered separately. Additionally, environmental operating specifications for the VAX-11/780 systems are provided.