Ampro Little Board 700, Reference Manual

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Chapter 3 Hardware
LittleBoard 700 Reference Manual 35
Pin # Signal Description
19 GND Digital Ground
20 Key Key pin plug
21 IDRQ0 Primary Device DMA Channel Request
22 GND Digital Ground
23 IOW* Primary Device I/O Read/Write Strobe
24 GND Digital Ground
25 IOR* Primary Device I/O Read/Write Strobe
26 GND Digital Ground
27 IORDY Primary Device I/O-DMA Channel Ready
28 Reserved Reserved
29 IDACK0* Primary Device DMA Channel Acknowledge
30 GND Digital Ground
31 IRQ14 Interrupt Request 14
32 NC Not connected
33 A1 IDE ATA Primary Disk Address (0 to 2). Used to indicate which byte in the
ATA command block or control block is being accessed
34 SD33_66 UDMA 33/66 Sense
35 A0 IDE ATA Primary Disk Address (0 to 2). Used to indicate which byte in the
ATA command block or control block is being accessed
36 A2 IDE ATA Primary Disk Address (0 to 2). Used to indicate which byte in the
ATA command block or control block is being accessed
37 CS0 Primary Slave/Master Chip Select
38 CS1 Primary Slave/Master Chip Select
39 Reserved Reserved
40 GND Digital Ground
Notes:
The shaded area denotes power or ground. The signals marked with * = Negative true logic.