VME-TB21 User’s Manual
4
The floppy drive interface is provided to a 34-position male header connector
(AMP part 103308-7 or equivalent) which will accept most standard floppy
cable assemblies. The connector is labeled “FLOPPY” on the TB21 silkscreen
and is component P3. Figure 3 shows the pin numbering of the connector. Table
2 shows the signals provided by the floppy interface.
Figure 3
Floppy Interface Connector Pin Locations
Pin 1
Pin 33
Pin 34
Pin 2
P3 Pin
Signal
Direction
Signal Description
Odd
GND
Signal Ground
2
FRWC-
To Drive
Read/Write Control
4
NC
Not Connected - Unused
6
NC
Not Connected - Unused
8
FINDEX-
From Drive
Index Mark Detected
10
FMT0-
To Drive
Motor On 0
12
FDS2-
To Drive
Drive Select 2
14
FDS1-
To Drive
Drive Select 1
16
FMT1-
To Drive
Motor Control 1
18
FDIRC-
To Drive
Step Motor Direction Control
20
FSTEP-
To Drive
Motor Step Control
22
FWD-
To Drive
Write Data
24
FWE-
To Drive
Write Enable
26
FTK0-
From Drive
Track 0 Position
28
FWP-
From Drive
Floppy is Write Protected
30
FRD-
From Drive
Read Data
32
FHS-
To Drive
Head (Side) Select
34
FDSKCHG-
From Drive
Disk Change Indicator
Table 2
Floppy Drive Interface Signals
Floppy Drive Interface
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