External Connections
VL-586-1 Reference Manual
Installation
–
49
J3 – F
LOPPY
D
ISK
D
RIVE
C
ONNECTOR
The VL-586-1 CPU card supports a standard 34-pin PC/AT style floppy disk interface at
connector J3.
Note
Note that Drive A and Drive B are reversed compared to a typical PC system. This
was done to accommodate a single Drive A using a straight ribbon cable without a
twist. Cable length must be 18” or less to maintain proper signal integrity. The
grounds in this connector should not be used to carry motor current.
Table 23: Floppy Disk Interface Connector Pinout.
J3
Pin
Signal
Name
Function
J3
Pin
Signal
Name
Function
1
Ground
Ground
18
DIR
Direction Select
2
R/LC
Load Head
19
Ground
Ground
3
Ground
Ground
20
STEP*
Motor Step
4
NC
No Connection
21
Ground
Ground
5
Ground
Ground
22
WDAT*
Write Data Strobe
6
NC
No Connection
23
Ground
Ground
7
Ground
Ground
24
WGAT*
Write Enable
8
INDX*
Beginning Of Track
25
Ground
Ground
9
Ground
Ground
26
TRK0*
Track 0 Indicator
10
MTR1*
Motor Enable 1
27
Ground
Ground
11
Ground
Ground
28
WPRT*
Write Protect
12
DRV0*
Drive Select 0
29
Ground
Ground
13
Ground
Ground
30
RDAT*
Read Data
14
DRE1*
Drive Select 1
31
Ground
Ground
15
Ground
Ground
32
HDSL
Head Select
16
MTR0*
Motor Enable 0
33
Ground
Ground
17
Ground
Ground
34
DCHG
Drive Door Open
Summary of Contents for VL-586-1
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