Technical Information 1-13
I/O Addressing
The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex)
addresses of I/O devices are listed in Table 1-6.
Table 1-6 I/O Address Map
Address (Hex)
I/O Device Name
0000-000F
DMA controller 1 (channel 0-3)
0020-0021
Interrupt controller 1
0040-0043
Timer 1
0048-004B
Timer 2
0061
NMI status and control
0064
Keyboard controller byte
0070-007F
Real-time clock, NMI mask
0080-008F
DMA page registers
00A0-00A1
Interrupt controller 2
00C-00DE
DMA controller 2
00E0-00EF
Reserved
00F0
Clear math coprocessor error
00F1
Reset math coprocessor
0F8-0FF
Math coprocessor
170-177
Secondary hard disk controller
1F0-1F7
Primary hard disk controller
200-207
Game I/O
220-22F
Sound port
238-23F
Serial port 4 (used for remapping)
278-27F
Parallel port 2
2B0-2DF
Alternate EGA adapter
2F8-2FF
Serial port 2
338-33F
Serial port 3 (used for remapping)
378-37F
Parallel port 1
3B0-3BF
Mono display and printer adapter
3C0-3CF
EGA adapter
3D0-3DF
CGA adapter
3F0-3F7
Primary diskette drive controller
3F8-3FF
Serial port 1
CF8-CFF
PCI configuration
Summary of Contents for POWERMATE P2166
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