Technical data

Device Mapping
B-4
I/O Address Map
Range
(hexidecimal) Function
000 - 00F DMA controller A
020 - 021 Master interrupt controller
024 Index register - system board
026 Data register - system board
040 - 043 Interval timer
060 - 06F Keyboard controller
070 - 07F Real-time clock (RTC), NMI
080 - 08F DMA page register
0A0 - 0A1 Slave interrupt controller
0C0 - 0CF DMA controller B
0F0 Clear math coprocessor
0F1 Reset math coprocessor
0F8 - 0FF Math coprocessor
150 - 157 ESS 1878 control interface
170 - 177 Secondary IDE controller
1F0 - 1F7 IDE controller
201 MIDI/Joystick
220-22F On-board Audio (ESS 1878)
278 - 27F
*
LPT2
continued