Abaco Systems / SBS / Bit 3 82002045 VMEbus Adapter Card
  • GE_Fanuc_SBS_Bit_3_Model_403_202_View1_2016107103434
  • GE_Fanuc_SBS_Bit_3_Model_403_202_View2_2016107103434
  • GE_Fanuc_SBS_Bit_3_Model_403_202_View3_2016107103434

Abaco Systems / SBS / Bit 3 82002045 VMEbus Adapter Card

This unit does not have a faceplate; however, this does not affect its ability to function properly.

Part Number: 82002045

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Stock # 89921-2
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Abaco Systems / SBS / Bit 3 Model 403 IBM PC/AT Computer to a VMEbus System Adapter

  • A24 or A16 Addressing from the PC/AT to the VMEbus
  • Parity Checking on Address, Control, and Data Lines
  • Handshake Mode


The GE Fanuc / SBS / Bit 3 Model 403 IBM PC/AT Computer to a VMEbus System Adapter is designed for fast, cost-effective sharing of memory and special purpose boards. The Model 403 Adapter provides high-speed data transfers between the PC/AT bus and VMEbus, and requires minimal software support. The Model 403 interconnects the PC/AT and VMEbus at the physical layer. Working at the lowest level, the bus, the Adapter allows the two systems to share memory; memory appears to and is treated by each system as if it were its own. In addition, a card only available on one bus may be accessed and directly controlled by a device on the other bus. For example, an Array Processor board in the VMEbus chassis can be directly controlled by the PC/AT processor.

The Model 403 Adapter uses Memory Mapping for inter-system communications. Memory Mapping controls random access (PIO transfers) to VMEbus address space and dual-port memory. It provides an easy-to-use interface with low overhead that permits two processors to communicate via 8-bit and 16-bit random access memory reads and writes. The PC/AT system can access up to 16M bytes of VMEbus system memory through a window in the PC/AT's address space. With the Bit 3 Adapter, each bus operates asynchronously and independently. The buses are linked only when a memory or I/O reference is made to an address on the PC/AT system that translates to a reference on the VMEbus system. The integrity of the interface between the Adapter cards is maintained by parity checks on address, control, and data lines. The Adapter functions as a slave PC/AT device allowing memory references to it to pass to the VMEbus chassis. Although the VMEbus cannot directly address the PC/AT, data can be passed by VMEbus masters to and from the PC/AT via an optional shared Dual Port RAM card.

Product Family: Model 403, 403, 403-201

Important Notice: Please note that any additional items included with this equipment such as accessories, manuals, cables, calibration data, software, etc. are specifically listed in the above stock item description and/or displayed in the photos of the equipment. Please contact one of our Customer Support Specialists if you have any questions about what is included with this equipment or if you require any additional information.

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GE Fanuc / SBS / Bit 3 Model 403 IBM PC/AT Computer to a VMEbus System AdapterGE Fanuc / SBS / Bit 3 Model 403 IBM PC/AT Computer to a VMEbus System AdapterGE Fanuc / SBS / Bit 3 Model 403 IBM PC/AT Computer to a VMEbus System Adapter

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