AT&T 3B2/300 Technical Reference Manual page 199

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CM525B VMEbus CARD
The Versa Modula Europa bus (VMEbus) is an industry standard bus for a variety of character and
networking controllers. The CM525B VMEbus Card provides the circuit interface between the 3B2
Buffered Microbus (BUB) backplane slot and the VMEbus System Controller.
The CM525B Card is a double-width card measuring 13.0 inches wide by 7.4 inches deep.
Figure 2-61 shows the component layout of a CM525B VMEbus Card. Connector pinout information is
provided in Appendix B. The major components of the CM525B Card are listed below:
• A 16-MHz internal clock
• An AMD29114 Interrupt Controller
• Four 8K by 8 Static Random Access Memory (SRAM).
EQUIPMENT DESCRIPTION 2-175