FUJITSU D1961 - Manual (Page 23)

Pin assignment of internal ports
A26361-D1961-Z120-1-7419, edition 2 English - 13
Floppy interface
1
Pin Signal Pin Signal
1 GND 18 Step DIR (low asserted)
2 FDHDIN (low asserted) 19 GND
3 GND 20 Step Pulse (low asserted)
4 not connected 21 GND
5 Key 22 Write Data (low asserted)
6 not connected 23 GND
7 GND 24 Write Enable (low asserted)
8 Index (low asserted) 25 GND
9 GND 26 Track 0 (low asserted)
10 Motor A Enable (low
asserted)
27 GND
11 GND 28 Write Protect (low
asserted)
12 Drive B Select (low
asserted)
29 GND
13 GND 30 Read Data (low asserted)
14 Drive A Select (low
asserted)
31 GND
15 GND 32 Side 1 Select (low
asserted)
16 Motor B Enable (low
asserted)
33 GND
17 GND 34 Disk Change (low asserted)