PC/104接口定义
PC/104接口定义

PC/104 是美国 Ampro Computers 在 80 年代末期所发展出来的接口规格，并且在 1992年公开以增加普及性。PC/104 的 PC 指的当然就是个人电脑，而 104 就是这个接口规格的总脚数。从嵌入式系统系统的角度来看，PC/104 的好处在于它比目前电脑标准的 ISA 接口规格小得多、整合了主板与插卡的架构、降低讯号驱动力与电源的要求以配合嵌入式系统的需求。



形体尺寸3.6x3.8英寸（91x96毫米），叠高不超过0.6英寸（16毫米）。

146pin 16位PC/104接口连接器外形图

• 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.