I/O Addressing; I/O Address Map - NEC POWERMATE PROFESSIONAL - SERVICE MANUAL 05-1997 Service Manual

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 1-4.
Address (Hex)
0000-000F
0020-0021
002E-002F
0040-0043
0048-004B
0060
0061
0064
0070, bit 7
0070, bits 6 through 0 PIIX3 - Real time clock, address
0071
0078-0079
0080-008F
00A0-00A1
00C0-00DE
00F0
0170-0177
01F0-01F7
0200-0207
0220-022F
0278-027F
02F8-02FF
0330-0331
0376
0377
0378-037F
0388-038B
03BC-03BF
Table 1-4 I/O Address Map
I/O Device Name
PIIX3 - DMA controller 1 (channel 0-3)
PIIX3 - Interrupt controller 1
87308B I/O base configuration registers
PIIX3 - Timer 1
PIIX3 - Timer 2
Keyboard controller byte - Reset IRQ
PIIX3 - NMI, speaker control
Keyboard controller, command/status byte
PIIX3 - Enable NMI
PIIX3 - Real time clock, data
Reserved - board configuration
PIIX3 - DMA page registers
PIIX3 - Interrupt controller 2
PIIX3 - DMA controller 2
Reset numeric error (numeric data processor)
Secondary IDE channel
Primary IDE channel
Game port
Yamaha audio
Parallel port 2
Onboard serial port 2
MPU-401 (MIDI)
Secondary IDE channel command port
Secondary IDE channel status port
Parallel port 1
Yamaha audio
Parallel port 3
Technical Information 1-9