I/O Addressing; I/O Address Map - NEC POWERMATE 4100M Service Manual

1-8 Technical Information

I/O Addressing

The processor communicates with I/O devices by I/O mapping. The hexadecimal (hex) ad-
dresses of I/O devices are listed in Table Section 1-3.
Address (Hex)
000-01F
020-03F
040-05F
060-063
060-06F
070-07F
080
081-09F
0A0-0AF
092
094
095
097
0A0-0BF
0C0-0DF
0E0-0EF
170-177
1F0-1F7
1F9-1FF
200-207
278-27F
2F8-2FF
370-377
378-37F
3A0-3AF
3B0-3DF
3B0-3BF
3C0-3CF
Table Section 1-3 I/O Address Map
I/O Device Name
DMA controller 1 (channel 0-3)
Interrupt controller
Timer
PPI (Programmable Peripheral Interface) keyboard, equipment switches,
timer
Keyboard controller
Real-time clock, CMOS memory, NMI mask
Manufacturer's diagnostic checkpoint
DMA page register
NMI (non-maskable interrupt) mask
PS/2 alternate Fast A20 Gate, Hot Reset
Extended system port (NEC-specific hardware setup)
Extended system port (NEC-specific hardware setup)
Extended system port (NEC-specific hardware setup)
Interrupt controller 2
DMA controller 2 (channel 4-7)
Reserved
2nd hard disk
1st hard disk
Reserved
Game I/O adapter (not available)
2nd parallel port (3rd with DMA)
2nd asynchronous communications port
Diskette controller 2
1st parallel port (2nd with DMA)
Primary bisynchronous communications port
Video Graphics Array (VGA)
Monochrome display adapter/printer 1
Enhanced Graphics Adapter (EGA) 1