Isa I/O Address Map - Compaq AlphaPC 164LX User Manual

ISA I/O Address Map

Table 6–1 ISA Interrupts (Continued)
Interrupt Number Interrupt Source
IRQ13
IRQ14
IRQ15
1
The # symbol indicates an active low signal.
6.2 ISA I/O Address Map
Table 6–2 lists the AlphaPC 164LX ISA I/O space address mapping.
Table 6–2 ISA I/O Address Map
Range (hex)
000-00F
020-021
040-043
060-061
070
080-08F
0A0-0A1
0C0-0DF
2F8-2FF
370-377
3BC-3BF
3F0-3F7
3F8-3FF
800
801
804-806
Interrupts and ISA Bus Addresses
6–2
Available
EIDE
EIDE
Usage
8237 DMA #1
8259 PIC #1
8253 timer
Ubus IRQ12 and NMI control
CMOS RAM address and NMI mask register
DMA page registers
8259 PIC #2
8237 DMA #2
Serial port—COM2
Secondary diskette (floppy)
Parallel port—LPT1
Primary diskette (floppy)
Serial port—COM1
FLASH_ADR19 register
AlphaPC 164LX configuration register
PCI interrupt registers