ISA Bus Pinout

 

    The ISA bus is one of the most important functional parts of any IBM PC compatible. It offers a consistent interface to many different types of peripheral board. Although largely superseded today with PCi bus  it is nonetheless a standard which cannot be ignored. The table below summarises the ISA bus in easy view format.

 
   
Signal Name Pin Pin Signal Name
Ground B1 A1 -I/O CH CK
RESET DRV B2 A2 SD7
+5 V dc B3 A3 SD6
IRQ 9 B4 A4 SD5
-5 V dc B5 A5 SD4
DRQ2 B6 A6 SD3
-12 V dc B7 A7 SD2
-0WS B8 A8 SD1
+12 V dc B9 A9 SD0
Ground B10 A10 I/O CH RDY
-SMEMW B11 A11 AEN
-SMEMR B12 A12 SA19
-IOW B13 A13 SA18
-IOR B14 A14 SA17
-DACK3 B15 A15 SA16
DRQ3 B16 A16 SA15
-DACK1 B17 A17 SA14
DRQ1 B18 A18 SA13
-REFRESH B19 A19 SA12
CLK B20 A20 SA11
IRQ7 B21 A21 SA10
IRQ6 B22 A22 SA9
IRQ5 B23 A23 SA8
IRQ4 B24 A24 SA7
IRQ3 B25 A25 SA6
-DACK2 B26 A26 SA5
TC B27 A27 SA4
BALE B28 A28 SA3
+5 V dc B29 A29 SA2
OSC B30 A30 SA1
Ground B31 A31 SA0
Key
-MEM CS16 D1 C1 -SBHE
-IO CS16 D2 C2 LA23
IRQ10 D3 C3 LA22
IRQ11 D4 C4 LA21
IRQ12 D5 C5 LA20
IRQ15 D6 C6 LA19
IRQ14 D7 C7 LA18
-DACK0 D8 C8 LA17
DRQ0 D9 C9 -MEMR
-DACK5 D10 C10 -MEMW
DRQ5 D11 C11 SD08
-DACK6 D12 C12 SD09
DRQ6 D13 C13 SD10
-DACK7 D14 C14 SD11
DRQ7 D15 C15 SD12
+5 V dc D16 C16 SD13
-MASTER D17 C17 SD14
Ground D18 C18 SD15
   
                   
         
                   
 

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