Floppy Disk Drive connector (46-way)

Standard 8 inch Floppy Disk Interface pinout (only relevant pins named).

All signals active-low.

Gnd 1 o o 2  
Gnd 3 o o 4  
Gnd 5 o o 6  
Gnd 7 o o 8  
Gnd 9 o o 10  
Gnd 11 o o 12  
Gnd 13 o o 14 Side select
Gnd 15 o o 16  
Gnd 17 o o 18  
Gnd 19 o o 20 Index
Gnd 21 o o 22 Ready
Gnd 23 o o 24  
Gnd 25 o o 26 Drive select 1
Gnd 27 o o 28 Drive select 2
Gnd 29 o o 30 Drive select 3
Gnd 31 o o 32 Drive select 4
Gnd 33 o o 34 Dir select
Gnd 35 o o 36 Step
Gnd 37 o o 38 Write Data
Gnd 39 o o 40 Write Gate
Gnd 41 o o 42 Track 00
Gnd 43 o o 44 Write Prot
Gnd 45 o o 46 Read Data