a
c
+5 V
1 +5 V
2
+ 12 V
RESET/ 3
RESET IN /
IOW/ 4
I OR/
ME MW/
5 ME M R/
BD1
6 BDO
BD3
7 BD2
BD5
8 BD4
BD7
9
BD6
REA DY DMA
10
A B T R I/
EOP/ 11
IN TAC K / 12
IFSEL 4/
AUTO /
13 D IR /
TH O L D / 14
H LD A
PCLK/
15
CLK1
LGRD
16
TR A M D /
BA19
17
BA 18
BA 17
18
BA 16
BA 15
19 BA14
BA13
20
BA 12
B A 1 1 21
BA10
BA9
22
BA8
BA7
23
BA6
BA5
24
BA4
BA3
25 BA2
BA1
26 BAO
IFSEL3/ 27
IFSEL2/
IFSE L1/
28
IFSELO/
DRQ1
29
DRQO
DAC K1/ 30
DACKO/
W AIT/
31
I NT/
LGRD
32
LGRD
Figure 2.3 Bus (J2-J6) pin assignments
Two additional plug/socket connections are possible on the
bus. These are made on the solder side of the controller board and
are designated J2A and J7A. These connectors are not considered
to be user accessible, rather for factory use, or for use by field
engineers and system integrators. Normally, these two connectors
are used for:
• J2A — The connection of the fixed disk interface board, or
a custom design board.
• J7A — The connection of the 16-bit processor board (factory
option and kit K230).
2-4
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