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Documentation Number PCRTC2095 Manual 15
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
Hardware I/O Map of AT Class Machines
Hex Address Address Function in AT Class Machines
000-01F
DMA controller #1 (8237A-5)
020-03F
interrupt controller #1 (8259A)
040-05F
timer (8254)
060-06F
keyboard (8042)
070-07F
NMI - non maskable interrupt & CMOS RAM
080-09F
DMA page register (74LS612)
0A0-0BF
interrupt controller #2 (8259A)
0C0-0DF
DMA controller #2 (8237A)
0F0-0FF
80287 math coprocessor
1F0-1F8
hard disk
200-20F
game port joystick controller
258-25F
Intel Above Board
278-27F
parallel printer port 2
2E8-2EF
COM4 serial port
2F8-2FF
COM2 serial port
300-31F
prototype card
378-37F
parallel printer 1
380-38F
SDLC or bisynch com 2
3A0-3AF
bisynch com 1
3B0-3BF
MDA - monochrome adapter
3BC-3BE
parallel printer on monochrome adapter
3C0-3CF
EGA - reserved
3D0-3D7
CGA - color graphics adapter
3E8-3EF
COM 3 serial port
3F0-3F7
floppy diskette controller
3F8-3FF
COM1 serial port
Any eight byte space not listed above and not used by any
other equipment in your system may be used for the serial port.