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5.0 ISA Signal Usage Legend: I/O = Input and Output I = Input O = Output - = Signal not needed An I/O shown in parentheses () indicates that the signal is optional for this devices. The following table indicates typical signal usage by an ISA system board: Signal Name System Board Usage Signal Name System Board Usage AEN O -MEM CS16 I/O BALE O -MEMR I/O CLK O -MEMW I/O -DACK O OSC O DRQ I -REFRESH I/O -IO CS16 I RESET DRV O -I/O CH CK I SA I/O I/O CH RDY I/O SD I/O -IOR I/O -SBHE I/O -IOW I/O -SMEMR I/O IRQ I -SMEMW I/O LA I/O TC I/O -MASTER I -0WS I The following table indicates typical signal usage by the various types of ISA expansion boards: Signal Name ISA Bus Master ISA 16-bit Mem Slave ISA 16-bit I/O Slave ISA 8-bit Mem Slave ISA 8-bit I/O Slave ISA DMA Device AEN - - I - I - BALE - I - (I) - - CLK (I) (I) (I) (I) (I) (I) -DACK I - - - - I DRQ O - - - - O -IO CS16 I - O - - - -I/O CH CK (O) (O) (O) (O) (O) (O) I/O CH RDY I (O) (O) (O) (O) - -IOR O - I - I I -IOW O - I - I I IRQ (O) (O) (O) (O) (O) (O) LA(23:17) O I - (I) - - -MASTER O - - - - - -MEM CS16 I 0 - - - - -MEMR O I - (I) - - -MEMW O I - (I) - - OSC (I) (I) (I) (I) (I) (I) -REFRESH (O) I - I - - RESET DRV I I I I I I SA(16:0) O I I I I - SA(19:17) - (I) - (I) - - SD(7:0) I/O I/O I/O I/O I/O I/O SD(15:8) I/O I/O I/O - - (I/O) -SBHE O I I - - - -SMEMR - - - I - - -SMEMW - - - I - - TC - - - - - (I) -0WS - (O) - (O) (O) - -------------------------------------------------------------------------------- 6.0 ISA Connector Pinout 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 Copyright ? 1999-2002 TechFest.com. All Rights Reserved.