Abaco Systems / SBS / Bit 3 85154556 A32/D32 VMEbus Adapter

The Abaco Systems / SBS / Bit 3 Model 85154556 A32/D32 VMEbus Adapter connects two VMEbus systems to enable high-speed inter-system data sharing and resource access. This adapter allows each connected system to directly address resources on the remote VMEbus as local memory, facilitating transparent data, I/O command, and interrupt transfer between chassis. The adapter supports random access reads and writes to the remote bus, enabling one system to operate as a coprocessor or primary bus controller in the peer chassis.

Technical Specifications

• Model Number: 85154556 (Related Part Numbers: 85154538, BIOS Part Number 85154596)


• Manufacturer: Abaco Systems / SBS / Bit 3


• Primary Function: VMEbus-to-VMEbus interconnection adapter


• Address Support: A32/D32 addressing; compatible with A16, A24, A32, A64 addressing modes


• Data Transfer Modes: D32 data width; supports D8, D16, D32, D64 data sizes


• Transfer Types: Block Transfer (BLT), Read-Modify-Write (RMW), Unaligned Address Transfer (UAT)


• Bus Arbitration: SGL, PRI, RRS arbiters supported


• Release Types: ROAK, ROR, RORA, RWD


• Standards Compliance: VME-32 and VME-64


• Data Integrity: Parity protection on address, control, and data lines


• Form Factor: 6U VMEbus module


• Shipping Weight: ~3 lbs

Key Features

• Random access read/write cycles to remote VMEbus resources


• Transparent inter-system addressing without protocol conversion


• Direct data, command, and interrupt transfer between VMEbus domains


• Dual-role operation: coprocessor or bus controller configuration


• Parity-protected address, control, and data integrity

Typical Applications

• Multi-chassis VMEbus system integration


• Distributed computing architectures with shared memory access


• Coprocessor and controller configurations in VME-based platforms


• System expansion requiring inter-VMEbus resource sharing

Compatibility & Integration The adapter integrates with additional interconnect adapters to support star and daisy-chain topologies across multiple VMEbus systems. Compatible with systems requiring VME-32 and VME-64 compliance.