Specifications
Table 2-17 shows the pinout and signal defmitions
of
the floppy disk interface connector (J8).
J8 is identical
in
pinout with the floppy connector
of
a standard PC. Note that
in
a PC,
both
drives
are
normally jumpered
the
same
--
as the second drive.
The
drives are differentiated
by
swappina a group
of
seven
wires (conductors 10-16) in the cable-between the board and-
the fIrst physical drive (drive A).
Table
2-17.
Floppy
Disk
Interface
Connector
(J8)
PIN
SIGNAL
NAME
FUNCTION
IN/ClJT
2
-RPM/-RWC
Speed/Prec~
(option)
out
4
---
(Not
used)
--
6
---
(Not
used)
--
8
-lOX
Index Pulse
in
10
-M01
Motor
On 1
out
12
-DS2
Drive Select 2
out
14
-DS1
Drive Select 1
out
16
-M02
Motor
On
2
out
18
-DIRC
Direction Select
out
20
-STEP
Step
out
22
-w
Write
Data
out
24
-WE
Write Enable
out
26
-TRKO
Track 0
in
28
-WP
Write Protect
in
30
-ROD
Read
Data
in
32
-HS
Head
Select
out
34 pull up
330
ohms
to
+5V
--
1-33
(all
odd pins) Signa l
grOl.llds
--
Floppy
Interface
Jumpering
Nme
jumper
options allow you to customize
the
operation
of
the floppy disk controller sub-
system.
The
main concerns are:
•
Jumpers
W32
and
W33 must
be
set
to
indicate
the
quantity
of
drives connected, as
shown
in
Table
2-18.
Only
1
or
2 actual floppy disk drives
can
be
interfaced
by
the
board's floppy controller. However, when using the
Ampro
SSD Support Software, two
additional SSD drives (emulating additional floppy drives) can
be
supported
in
addition
to
the
two actual floppy disk drives, so the choices
of
3
or
4 apply
in
this case.
2-18