Chapter 4 – Programming
4-2
I/O Map
Table Chapter 4 -2 illustrates the XVME-655’s I/O map.
Table Chapter 4 -2. I/O Map
Address Range
Device
000-01F
DMA controller 1, 8237A-5 equivalent
020-021
Interrupt controller, 8259 equivalent
022-023
Available
025-02F
Interrupt controller 1, 8259 equivalent
040-05F
Timer, 8254-2 equivalent
060-06F
Keyboard, 8742 equivalent
070-07F
Real-time clock, bit 7 NMI mask
080-091
DMA page register
93-9F
DMA page register
0A0-0BF
Interrupt controller 2, 8259 equivalent
0C0-0DF
DMA controller 2, 8237A-5 equivalent
0F0
N/A
0F1
N/A
0F2-0FF
N/A
100
Available
102
Available
103-1EF
Available
1F0-1F7
IDE controller (AT drive)
218
Xycom Temp/Abort port
219
Xycom LED/BIOS port
278-27F
Alternate parallel port
280-2F7
Available
2F8-2FF
Serial port 2
300-36F
Available
370-377
Alternate floppy disk controller
378-37F
Parallel port 1
380-3BF
Available
3C0-3DF
VGA/EGA
3E0-3EF
Available
3F0-3F7
Primary floppy disk controller
3F8-3FF
Serial port 1
4D0
ELCR1 edge- or level-triggered interrupt
4D1
ELCR2 edge- or level-triggered interrupt
CF8
PCI configuration address register
CF9
Reset control register
CFC
PCI configuration data register
Note
Serial and parallel port addresses are controlled in the BIOS setup
menus. Changing the setting will change the I/O location.
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