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Chapter 1 - INTRODUCTION
1.1 P R O D U C T OVERVIEW
The XVME-956 PC/AT family of products is designed to provide I/O expansion for Xycom's XVME
VMEbus PC/AT products. The XVME-956 consists of two sets of carrier cards and the accompanying
daughter modules with either a PC/XT or PC/AT interface. W h e n the daughter modules are installed
onto a carrier, the resulting module occupies a single double-high VMEbus card slot. The XVME-956
is designed to operate with Xycom's VMEbus PC/AT processor modules. The XVME-956 provides
the following features:
• P C / A T expansion I/O in a single VMEbus card slot
• O p e n architecture daughter modules available from Xycom and other vendors
• P i n and socket connector scheme (no card edge connectors)
• Convenient I/O front panel connections
The XVME-956 consists of carrier cards which drive the PC/AT signals from the host XVME PC/AT,
and expansion modules which provide the various PC/AT I / O functions, such as Ethernet, Solid State
Disk, Serial I/O, and SCSI. The carrier cards (XVME-956/1 and XVME-956/12) are made to be
compatible with Xycom's line of VMEbus PC/AT products. T h e XVME-956/12 is for use with the
Xycom XVME-PC/AT modules with PC/104 Expansion sites. Both the XVME-956/1 and 956/12
provide two expansion module sites and sit adjacent to the VMEbus PC/AT. T h e XVME-956/3
expansion kit provides the necessary standoffs and mating connectors for single module expansion on
an XVME-PC/AT with an on-board PC/104 expansion site.
Two types of expansion modules are offered. Type B modules have industry standard PC/104
mechanical dimensions of 3.550" x 3.775". Each Type B module requires a separate Xycom front
panel kit . Type A modules are 4.010" x 5.091" and are functionally the same as Type B modules but
have an integral front panel. Type A modules do not require a front panel kit.
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