Abaco Systems / SBS / Bit 3 85221518 Nanobus PCI Module

The Abaco Systems / SBS / Bit 3 85221518 Nanobus PCI Module bridges PCI and VMEbus architectures, enabling seamless integration of PCI-based systems into VMEbus environments. This adapter module functions as either a coprocessor or primary processor on the VMEbus, supporting bidirectional data transfer between heterogeneous bus topologies.

Technical Specifications

• Manufacturer: Abaco Systems / SBS / Bit 3


• Model: 85221518


• Product Family: 8522151B, 8522151B Revision A, 616-201, 617-201


• Memory: 128 KB SRAM


• Interface Connector: 62-pin


• Front Panel Connector: 68-pin


• Weight: 1 lbs per unit

Key Features

• Dual-mode inter-system communication via Memory Mapping (PIO transfers) and Direct Memory Access (DMA)


• PIO transfer capability between PCI system and VMEbus


• PCI bus to optional dual-port RAM communication


• VMEbus to PCI bus transfers


• 128 KB onboard SRAM for buffering and local processing

Typical Applications The 85221518 is suited for legacy system modernization, real-time data acquisition systems requiring PCI coprocessor acceleration, and embedded VMEbus environments integrating contemporary PCI peripherals. It serves instrumentation and avionics platforms where PCI expansion cards must operate within established VMEbus architectures.

Compatibility & Integration Designed as part of the Nanobus PCI Module product line, the 85221518 integrates with complementary Abaco Systems / SBS / Bit 3 offerings including PCI Host Cards and VMEbus Adapters. The module operates across the specified product family variants and supports both memory-mapped I/O and DMA-based system designs. Datasheets and technical documentation are available to support integration planning and firmware development.