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ISA Bus Pinout |
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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 Although largely superseded today with PCi bus it is nonetheless a standard which cannot be ignored.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. |
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| 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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A Range of Affordable
USB Boards to make PC Input/Output Easy for the Hobbyist |
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© Copyright pc-control.co.uk 2008 |
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