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6–2 Interrupts and ISA Bus Addresses

ISA I/O Address Map

6.2 ISA I/O Address Map

Table 6–2 lists the AlphaPC 164LX ISA I/O space address mapping.

IRQ13 Available

IRQ14 EIDE

IRQ15 EIDE

The # symbol indicates an active low signal.

Table 6–2 ISA I/O Address Map

Range (hex) Usage

000-00F 8237 DMA #1

020-021 8259 PIC #1

040-043 8253 timer

060-061 Ubus IRQ12 and NMI control

070 CMOS RAM address and NMI mask register

080-08F DMA page registers

0A0-0A1 8259 PIC #2

0C0-0DF 8237 DMA #2

2F8-2FF Serial port—COM2

370-377 Secondary diskette (floppy)

3BC-3BF Parallel port—LPT1

3F0-3F7 Primary diskette (floppy)

3F8-3FF Serial port—COM1

800 FLASH_ADR19 register

801 AlphaPC 164LX configuration register

804-806 PCI interrupt registers

Table 6–1 ISA Interrupts (Continued)

Interrupt Number Interrupt Source

1 2 ... 35 36 37 38 39 40 41 42 43 44 45 ... 81 82

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