Ampro Corporation 486E manual AT Expansion Bus Connector, B1-B32 P1

Product Reference

Table 2–47. AT Expansion Bus Connector, B1-B32 (P1)

Pin	Signal	Function	In/Out	Current	PU/PD/S *
	Name
B1	GND	Ground	N/A	N/A
B2	RESETDRV	System reset signal	OUT	4 mA
B3	+5V	+5 Volt power	N/A	N/A
B4	IRQ9	Interrupt request 9	IN	N/A	27K PU
B5	-5V	To J7-5	N/A	N/A
B6	DRQ2	DMA request 2	IN	N/A	2.2K PD
B7	-12V	To J7-6	N/A	N/A
B8	ENDXFR*	Zero wait state	IN	N/A
B9	+12V	To J7-4	N/A	N/A
B10	Key	Key pin	N/A	N/A
B11	SMEMW*	Mem Write(lwr 1MB)	I/O	4 mA	22 S, 27K PU
B12	SMEMR*	Mem Read(lwr 1MB)	I/O	4 mA	22 S, 10K PU
B13	IOW	I/O Write	I/O	4 mA	22 S, 27K PU
B14	IOR	I/O Read	I/O	4 mA	22 S, 27K PU
B15	DACK3*	DMA Acknowledge 3	OUT	6 mA
B16	DRQ3	DMA Request 3	IN	N/A	2.2K PD
B17	DACK1*	DMA Acknowledge 1	OUT	6 mA
B18	DRQ1	DMA Request 1	IN	N/A	2.2K PD
B19	REFRESH*	Memory Refresh	I/O	4 mA	22 S,1K PU
B20	SYSCLK	Sys Clock	OUT	4 mA
B21	IRQ7	Interrupt Request 7	IN	N/A	27K PU
B22	IRQ6	Interrupt Request 6	IN	N/A	27K PU
B23	IRQ5	Interrupt Request 5	IN	N/A	27K PU
B24	IRQ4	Interrupt Request 4	IN	N/A	10K PU
B25	IRQ3	Interrupt Request 3	IN	N/A	10K PU
B26	DACK2*	DMA Acknowledge 2	OUT	6 mA
B27	TC	DMA Terminal Count	OUT	4 mA
B28	BALE	Address latch enable	OUT	4 mA
B29	+5V	+5V power	N/A	N/A
B30	OSC	14.3 MHz clock	OUT	6 mA	33 S
B31	GND	Ground	N/A	N/A
B32	GND	Ground	N/A	N/A
	* PU = pull up; PD = pull down; S = resistance in series. All values in ohms.

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