
J1 JTAG connector to system rack
J2 Serial port connector to inside bulkhead card
J3 Speaker connector
J4 Diskette drive connector
J5 Parallel port connector
J6 Keyboard/mouse connector to inside bulkhead card
J16 Write protect DASD FLASH (if jumper is on pins)
J17 Operator panel connector from the system rack
J18 TestPort 0
J19 TestPort 1
J20 TestPort 2
J22 Write protect boot FLASH (if jumper is set between pins 2 and 3)
Appendix D. Cabling the System Rack and I/O Rack 55