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146 pin PC/104 16 bit connector layout
146 pin PC/104 16 bit connector
PC/104 is a compact version of the ISA bus. PC/104 is intended for specialized embedded computing environments where applications depend on reliable data acquisition despite an often extreme environment.

PC/104 modules can be of two bus types, 8-bit and 16-bit. These correspond to the PC and PC/AT buses, respectively.

Pin J1/P1 J1/P1 J2/P2 (16-bit modules only) J2/P2 (16-bit modules only)
Number Row A Row B Row C1 Row D1
0----0V0V
1IOCHCHK*0VSBHE*MEMCS16*
2SD7RESETDRVLA23IOCS16*
3SD6+5VLA22IRQ10
4SD5IRQ9LA21IRQ11
5SD4-5VLA20IRQ12
6SD3DRQ2LA19IRQ15
7SD2-12VLA18IRQ14
8SD1ENDXFR*LA17DACK0*
9SD0+12VMEMR*DRQ0
10IOCHRDY(KEY)2MEMW*DACK5*
11AENSMEMW*SD8DRQ5
12SA19SMEMR*SD9DACK6*
13SA18IOW*SD10DRQ6
14SA17IOR*SD11DACK7*
15SA16DACK3*SD12DRQ7
16SA15DRQ3SD13+5V
17SA14DACK1*SD14MASTER*
18SA13DRQ1SD150V
19SA12REFRESH*(KEY)2 0V
20SA11SYSCLK----
21SA10IRQ7----
22SA9IRQ6----
23SA8IRQ5----
24SA7IRQ4----
25SA6IRQ3----
26SA5DACK2*----
27SA4TC----
28SA3BALE----
29SA2+5V----
30SA1OSC----
31SA00V----
320V0V----

Rows C and D are not required on 8-bit modules. B10 and C19 are key locations.
Signal timing and function are as specified in ISA specification. Signal source/sink current differ from ISA values.

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