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2IQEC2/43798 Manual Appendix A: Hardware I/O Maps A-1
B&B Electronics -- PO Box 1040 -- Ottawa, IL 61350
PH (815) 433-5100 -- FAX (815) 433-5105
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 printer
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