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Chapter 6 Hardware Installation
59
Step 5 Set Jumpers, Continued
J1 Termination Enable J1 is a three-pin header that specifies hardware or
software control of SCSI termination.
Type of SCSI Termination J1 Setting
Software control of SCSI termination via drive
detection.
Short Pins 1-2
Permanently disable all onboard SCSI termination. Short Pins 2-3
Permanently enable all onboard SCSI termination. OPEN
J3 I2C Interface Connector J3 is a four-pin header that allows the i960JX
core processor to serve as a master and slave device that
resided on the I2C bus when used with the I2C Bus
Interface Unit. Attach a four-wire cable from J3 to the I2C
Bus Interface Unit.
J4 Serial Port J4 is a 9-pin berg that attaches to a serial cable. The pinout:
Pin Signal Description Pin Signal Description
1 Carrier Detect 2 Data Set Ready
3 Receive Data 4 Request to Send
5 Transmit Data 6 Clear to Send
7 Data Terminal Ready 8 Ring Indicator
9 Ground
J5 Hard Disk LED J5 is a four-pin connector that attaches to a cable that
connects to the hard disk LED mounted on the computer
enclosure. The LED indicates data transfers.
Pin Description
1High
2 SCSI Activity Signal
3 SCSI Activity Signal
4High
Cont’d