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8-15

Table 8-10. Shunt Jumper and Switch Settings for the Multipurpose Fixed Disk Drive Controller Board (assy. no. 000336-001 and -021)

Jumper or	Function	Switch Setting
Switch Position
J11	Asynchronous	Open connectors on left—serial
(Shunt Jumper)	communication	interface COM1 IRQ4 (default)
		Open connectors on right—serial
		interface COM2 IRQ3

J21	Controller address	Open connectors on left—primary
		diskette controller address (default)
		Open connectors on right—
		secondary diskette controller address
Switch 1-1	Fixed disk drive	ON = Enable
		OFF = Disable

Switch 1-2	Parallel printer port	ON = Enable (default)
		OFF = Disable
Switch 1-32	Serial port	ON = Enable (default)
		OFF = Disable
Switch 1-4	Reserved	OFF

1To change the setting, remove the shunt jumper from its socket, rotate it 180 degrees, then reinstall it in the socket.

2Reserved on 000336-001 Rev. P or earlier.

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