17
5.
Floppy Disk Interface
The floppy disk interface can support two drives. The drives may be 3.5" (720K or
1.44M), 5.25" (360K or 1.2M), or a mix of the two.
5.1
Connector
The floppy disk connector is a 34-pin, dual-in-line, male header designated J12.
The required cable connects to 5.25" floppy drives via a 34-pin female edge connector and
to 3.5" drives via a 34-pin socket connector. In a two drive system, the drives are
connected in a daisy chain fashion, one at the end of the cable and one in the middle. The
first drive, drive A, is always connected to the end connector. The middle connector is
used for the second drive, drive B. The daisy chain cable twists seven lines, 10 through
16, to correctly address the two floppies during operation (the twist is a "mirror" around
line 13, which remains stable). See Appendix A for ordering information.
E27
E28
E18
J1
1
1
J19
U7
U6
E9
U13
2
J2
J3
E5
U8
E8
E7
E6
2
J4
1
6
E16
E10
E14
E13
E11
E15
E12
U9
E17
U14
1
E1
J18
1
E3
E2
E4
3
U16
E19
E20
E21
E22
E23
E24
E25
U15
U10
E26
U11
J6
J7
J8
J5
1
1
1
J9
J10
U24
E29
BT1
E30
1
J11
Floppy
U18
1
J12
1
E31
E32
T1
U21
J17
1
J14
J13
1
J16
1
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