IBM 4840-544 Service Guide - Page 210
Diskette-drive, connector, Ethernet
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Connector-pin assignments Diskette-drive connector 14 26 August 3, 2006 1 13 Table 32. Assignment of diskette-drive connector pins Pin Signal I/O Pin Signal I/O 1 Ground 14 No connection 2 +5 V dc 15 No connection 3 Ground 16 No connection 4 Ground 17 Index sensing I 5 No connection 18 No connection 6 Drive select 0 O 19 No connection 7 Motor control 0 O 20 Ground 8 Direction (0=inward, O 21 Track step pulse O 1=outward) 9 Write data O 22 Write gate O 10 Ground 23 Track 0 sensing I 11 Drive density select 0 O 24 Write protect I 12 Read data I 25 Head select (0=side 1, O 1=side 0) 13 No connection 26 Diskette change I Ethernet connector 8 1 Table 33. Ethernet connector-pin assignments Pin Signal I/O Pin Signal I/O 1 TxD+ O 5 Ground 2 TxD− O 6 RxD− I 3 RxD+ I 7 Ground 4 Ground 8 Ground 184