User Manual

Documentation No.3PXCC1x-2x-3903 Appendix A: Hardware I/O A-1
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Appendix A: Hardware I/O Map
I/O Map of XT Class Machines
Hex Address Address Function in XT Class Machines
000-00F
DMA controller (8237A)
020-021
interrupt controller (8259A)
040-043
timer (8253)
060-063
PPI(8255A)
080-083
DMA page register (74LS612)
0A0-0AF
NMI - non maskable interrupt
200-20F
game port joystick controller
210-217
expansion unit
2E8-2EF
COM4 serial port
2F8-2FF
COM2 serial port
300-31F
prototype card
320-32F
hard disk
378-37F
parallel print
380-38F
SDLC
3B0-3BF
MDA - monochrome adapter and printer
3D0-3D7
CGA - color graphics adapter
3E8-3EF
COM3 serial port
3F0-3F7
floppy diskette controller
3F8-3FF
COM1 serial port
A-2 Appendix A: Hardware I/O Documentation No.3PXCC1x-2x-3903
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
B&B Electronics Ltd – Westlink Comm. Pk – Oranmore, Galway, Ireland – Ph [phone] – Fax [phone]
Any eight-byte space not used by one of the devices listed in the
table and not used by any other equipment in your system may be
used for the serial port.
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 bisync com 2
3A0-3AF
bisync 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