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Hardware Description
The SunHSI/S adapter consists of two Zilog Integrated Serial Communications
Controllers (ISCC), 32 KBytes of dual-ported RAM, 32 KBytes of EPROM,
3 bit-addressable latches, and various control and interface logic. A hardware block
diagram is shown in
.
FIGURE 1-2
All interface signals appear at the 96-pin connector on the rear edge of the SBus
adapter. The 96-pin cable adapts the 96-pin connector to four RS-449 connectors on
the patch panel. The cable and patch panel are shielded to meet FCC Class B EMI
regulations.
Appendix A contains instructions for building a null modem cable and an X.21-to-
RS-449 converter. An example of a typical RS-449 implementation and the RS-449
signal/pin assignments are also included.
See Appendix D for a more complete description of the hardware.
2
SunHSI/S Installation and Administration Guide • November 1998
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