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.
Table Section 1-3 I/O Address Map
Address (Hex)
I/O Device Name
000-01F
DMA controller 1 (channel 0-3)
020-03F
Interrupt controller
040-05F
Timer
060-063
PPI (Programmable Peripheral Interface) keyboard, equipment switches,
timer
060-06F
Keyboard controller
070-07F
Real-time clock, CMOS memory, NMI mask
080
Manufacturer's diagnostic checkpoint
081-09F
DMA page register
0A0-0AF
NMI (non-maskable interrupt) mask
092
PS/2 alternate Fast A20 Gate, Hot Reset
094
Extended system port (NEC-specific hardware setup)
095
Extended system port (NEC-specific hardware setup)
097
Extended system port (NEC-specific hardware setup)
0A0-0BF
Interrupt controller 2
0C0-0DF
DMA controller 2 (channel 4-7)
0E0-0EF
Reserved
170-177
2nd hard disk
1F0-1F7
1st hard disk
1F9-1FF
Reserved
200-207
Game I/O adapter (not available)
278-27F
2nd parallel port (3rd with DMA)
2F8-2FF
2nd asynchronous communications port
370-377
Diskette controller 2
378-37F
1st parallel port (2nd with DMA)
3A0-3AF
Primary bisynchronous communications port
3B0-3DF
Video Graphics Array (VGA)
3B0-3BF
Monochrome display adapter/printer 1
3C0-3CF
Enhanced Graphics Adapter (EGA) 1
Summary of Contents for PowerMate 466M
Page 10: ...Contents xiii ...
Page 176: ...Connector Pin Assignments A 15 ...