I/O Addressing; I/O Address Map - NEC POWERMATE V Service Manual

1-14 Technical Information

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 1-7.
Address (Hex)
0000-000F
0020-0021
0040-0043
0048-004B
0061
0064
0070-007F
0080-008F
00A0-00A1
00C-00DE
00E0-00EF
00F0
00F1
0F8-0FF
170-177
1F0-1F7
200-207
220-22F
238-23F
278-27F
2B0-2DF
2F8-2FF
338-33F
378-37F
3B0-3BF
3C0-3CF
3D0-3DF
3F0-3F7
3F8-3FF
CF8-CFF
Table 1-7 I/O Address Map
I/O Device Name
DMA controller 1 (channel 0-3)
Interrupt controller 1
Timer 1
Timer 2
NMI status and control
Keyboard controller byte
Real-time clock, NMI mask
DMA page registers
Interrupt controller 2
DMA controller 2
Reserved
Clear math coprocessor error
Reset math coprocessor
Math coprocessor
Secondary hard disk controller
Primary hard disk controller
Game I/O
Sound port
Serial port 4 (used for remapping)
Parallel port 2
Alternate EGA adapter
Serial port 2
Serial port 3 (used for remapping)
Parallel port 1
Mono display and printer adapter
EGA adapter
CGA adapter
Primary diskette drive controller
Serial port 1
PCI configuration