Pinouts of Connectors

PC/104 bus pinout

layout
schematic diagram
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PC/104 is a compact version of the ISA bus, optimized for the requirements of embedded systems

146 pin PC/104 16 bit connector pin-out & layout
146 pin PC/104 16 bit connector
Differences from ISA are:
  • Reduced form-factor to 90 by 96 mm.
  • Eliminated the need for backplanes or card cages, through its self-stacking bus
  • Minimized component count and power consumption (to typically 1-2 Watts per module), by reducing required bus drive on most signals to 4 mA.

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 -- -- 0V 0V
1 IOCHCHK* 0V SBHE* MEMCS16*
2 SD7 RESETDRV LA23 IOCS16*
3 SD6 +5V LA22 IRQ10
4 SD5 IRQ9 LA21 IRQ11
5 SD4 -5V LA20 IRQ12
6 SD3 DRQ2 LA19 IRQ15
7 SD2 -12V LA18 IRQ14
8 SD1 ENDXFR* LA17 DACK0*
9 SD0 +12V MEMR* DRQ0
10 IOCHRDY (KEY)2 MEMW* DACK5*
11 AEN SMEMW* SD8 DRQ5
12 SA19 SMEMR* SD9 DACK6*
13 SA18 IOW* SD10 DRQ6
14 SA17 IOR* SD11 DACK7*
15 SA16 DACK3* SD12 DRQ7
16 SA15 DRQ3 SD13 +5V
17 SA14 DACK1* SD14 MASTER*
18 SA13 DRQ1 SD15 0V
19 SA12 REFRESH* (KEY)2 0V
20 SA11 SYSCLK -- --
21 SA10 IRQ7 -- --
22 SA9 IRQ6 -- --
23 SA8 IRQ5 -- --
24 SA7 IRQ4 -- --
25 SA6 IRQ3 -- --
26 SA5 DACK2* -- --
27 SA4 TC -- --
28 SA3 BALE -- --
29 SA2 +5V -- --
30 SA1 OSC -- --
31 SA0 0V -- --
32 0V 0V -- --

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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Pinouts.ru > Pinouts of different motherboard slots >  Pinout of PC/104 bus and layout of 146 pin PC/104 16 bit connector

Source(s): PC/104 v2.3 spec, PC/104 pinout, PC/104 Consortium, from Hardware Book
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