BIT 3 Computer Corporation 85221510 PCI Adapter w/ DMA Controller Module

Overview

• The part is a PCI Adapter with DMA Controller Module made by Bit-3 (now part of Abaco Systems / SBS).

• It’s associated with Model 617, specifically a PCI bus to A32/D32 VMEbus adaptor, with built-in DMA support.

• The part number 85221510 is for the PCI module (“half”) of that adapter; there is also a VMEbus module counterpart in the full setup.

Technical Specs & Features

• Memory: It has 64 KB SRAM.

• DMA Capability: Supports direct memory access (DMA) to move data between the PCI system memory and the VMEbus.

• Bus Mastering: Bi-directional random access bus mastering, meaning either side (PCI or VMEbus) can act as master under certain conditions.

• Data Transfer Rates: Up to ~26 MB/s in some configurations from PCI → VMEbus; for VMEbus DMA into PCI memory somewhat slower (~10 MB/s or a bit more) depending on the setup.