18
X2 Signal Descriptions
Pin
Signal
Description
Type
PU/PD
Comment
1 GND
Ground
PWR - -
2 GND
Ground
PWR - -
3
SD14
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
4
SD15
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
5
SD13
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
6
MASTER# ISA 16-Bit Master
I*
PU 8K2 5V -
7
SD12
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
8
DREQ7
ISA DMA Request 7
I*
PD 4k7 to
GND
-
9
SD11
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
10
DACK7#
ISA DMA Acknowledge 7
IO*
no PU/PD
int. PU 100k
11
SD10
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
12
DREQ6
ISA DMA Request 6
I*
PD 4k7 to
GND
-
13
SD9
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
14
DACK6#
ISA DMA Acknowledge 6
IO*
no PU/PD
int. PU 100k
15
SD8
ISA Data Bus
IO*
PU 4k7 5V
int. PU 100k
16
DREQ5
ISA DMA Request 5
I*
PD 4k7 to
GND
-
17
MEMW#
ISA Memory Write
IO*
PU 8k2 5V
int. PU 100k
18
DACK5#
ISA DMA Acknowledge 5
IO*
no PU/PD
int. PU 100k
19
MEMR#
ISA Memory Read
IO*
PU 8k2 5V
int. PU 100k
20
DREQ0
ISA DMA Request 0
I*
PD 4k7 to
GND
-
21
LA17
ISA Address Bus (SA17)
O*
PU 4k7 5V
int. PU 100k
22
DACK0#
ISA DMA Acknowledge 0
IO* no
PU/PD
-
23
LA18
ISA Address Bus (SA18)
O*
PU 4k7 5V
int. PU 100k
24 IRQ14
ISA Interrupt Request 14 /
ROMChip Select
IO*
PU 4k7 5V
-
25
LA19
ISA Address Bus (SA19)
O*
PU 4k7 5V
int. PU 100k
26
IRQ15
ISA Interrupt Request 15
IO*
PU 4k7 5V
-
27
LA20
ISA Address Bus (SA20)
O*
PU 4k7 5V
int. PU 100k
28
IRQ12
ISA Interrupt Request 12
IO*
PU 4k7 5V
-
29
LA21
ISA Address Bus (SA21)
O*
PU 4k7 5V
int. PU 100k
30
IRQ11
ISA Interrupt Request 11
IO*
PU 4k7 5V
-
31
LA22
ISA Address Bus (SA22)
O*
PU 4k7 5V
int. PU 100k
32
IRQ10
ISA Interrupt Request 10
IO*
PU 4k7 5V
-
33
LA23
ISA Address Bus (SA23)
O*
PU 4k7 5V
int. PU 100k
34
IO16#
ISA 16-Bit I/O Access
I*
PU 1K 5V
-
35 GND Ground
PWR - -
36 GND Ground
PWR - -
37
SBHE#
ISA System Byte High Enable
IO*
PU 4k7 5V
int. PU 100k
38
M16#
ISA 16-Bit Memory Access
IO*
PU 1K 5V
-
39
SA0
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
40
OSC
ISA Oscillator (CLK_ISA14#)
O-3,3 - -
41
SA1
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
42
BALE
ISA Buffer Address Latch Enable
IO*
PD 4k7
int. PU 100k
43
SA2
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
44 TC ISA
Terminal
Count
IO*
PD 4k7
-
45
SA3
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
46
DACK2#
ISA DMA Acknowledge 2
IO* no
PU/PD
-
47
SA4
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
48
IRQ3
ISA Interrupt Request 3
IO*
PU 4k7 5V
-
49
SA5
ISA Address Bus
O*
PU 4k7 5V
int. PU 100k
50
IRQ4
ISA Interrupt Request 4
IO*
PU 4k7 5V
-