Xycom XVME-654, Manual

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Chapter 1 – Introduction
1-4
Keyboard Interface
The keyboard interface uses a PS/2-style connector out the front panel. The +5 V is
protected with a polyswitch. This device will open up if the +5 V is shorted to GND.
Once the shorting condition is removed, the polyswitch will allow current flow to
resume.
Hard and Floppy Drives
The XVME-654’s IDE hard drive and floppy drive signals are routed through the P2
connector, providing a simplified method of connecting external floppy and hard drives.
The XVME-654 will support only one floppy drive.
When used with the XVME-977 mass storage module, the hard and floppy drives do not
have to be located next to the processor. The XVME-977 can be installed in any
unoccupied VMEbus slot, and then connected to the XVME-654 through a cable on the
J2 connectors. This allows greater flexibility in configuring a VMEbus card cage.
For applications that require mass storage outside the VMEbus chassis, the XVME-973
driver adapter module plugs onto the VMEbus P2 connector. This module provides
industry standard connections for IDE and floppy signals. You can connect one floppy
drive to the XVME-973. This drive may be 2.88 Mbytes, 1.44 Mbytes, 1.2 Mbytes, or
360 Kbytes.
Caution
The total IDE cable length must not exceed 18 inches. Also, if two IDE drives are
connected, they must be no more than six inches apart.
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