Table 5-28 Internal Bard Disk Drive Connector 1 Signal 1 Ground Return 1 Signal Name 1 1------------------1--------------------1--------------------- I----~~--------~-------~----------~-------------------- 1 Pl-2 Pl-l Reserved 1 Pl-4 Pl-3 Reserved 1 BUS 1 Pl-6 Pl-5 -write Gate 1 Pl-8 Pl-7 -Seek Complete 1 Pl-10 Pl-9 -Track Zero 1 Pl-12 PI-II -Write Fault 1 Pl-14 Pl-13 -Head Select 2 0 1 Pl-16 Pl-15 Reserved 1 Pl-18 Pl-17 Head Select 21 1 Pl-20 Pl-19 -Index 1 Pl-22 Pl-21 -Ready 1 Pl-24 Pl-23 -Step 1 Pl-26 Pl-25 -Drive Select 1 1 Pl-30 Pl-29 -Drive Select 3 1 Pl-32 1 Pl-31 1 -Drive Select 4 1 Pl-34 1 Pl-33 1 -Direction In 1------------------1--------------------1--------------------- 1 Pl-28 Pl-27 -Drive Select 2 1 RADIAL 1----------------------------------------------------------- 1 P2-1 P2-2 -Selected 1 P2-3 P2-4 Reserved 1 P2-5 P2-6 Spare 1 P2-7 P2-8 Reserved 1 P2-9 Spare 1 P2-11 P2-12 Ground 1 P2-13 +MFM Write Data 1 P2-14 -MFM Write Data 1 P2-10 Spare 1 P2-15 P2-16 Ground 1 p2-17 +MFM Read Data 1 P2-18 -MFM Read Data 1 P2-19 1 P2-20 1 Ground 1------------------1--------------------1--------------------- 1 POWER 1 1 P3-1 +12 Volts DC 1 P3-2 +12 Volts DC Return 1 P3-3 1 1 +5 Volts DC Return 1 P3 -4 1 1 + 5 Vol t s DC 1------------------1--------------------1--------------------- 1 STRAP 1------------------------------------------------------------ 1 P4 I Frame Ground 1 1 NOTE:
These are connectors on the hard disk drive unit ~ on the Hard Disk Controller board. Refer to Appendix B for Controller board connections. 5-38