IBASE MB838 - Manual (Page 48)

APPENDIX
MB838 User’s Manual
48
Appendix
A. I/O Port Address Map
Each peripheral device in the system is assigned a set of I/O port
addresses which also becomes the identity of the device. The following
table lists the I/O port addresses used.
Address Device Description
000h - 01Fh DMA Controller #1
020h - 03Fh Interrupt Controller #1
040h - 05Fh System Timer
060h - 064h Keyboard Controller
070h - 07Fh Real Time Clock
080h - 09Fh DMA Controller #2
0A0h - 0BFh Interrupt Controller #2
0C0h - 0DFh DMA Controller #3
0F0h Clear Math Coprocessor Busy Signal
0F1h Reset Math Coprocessor
3B0h- 3DFh Graphics adapter Controller
3F8h - 3FFh Serial Port #0 (COM1)
2F8h - 2FFh Serial Port #1 (COM2)
3E8h – 3EFh Serial Port #2 (COM3)
2E8h – 2EFh Serial Port #3 (COM4)
3E8h - 3EFh Serial Port #4 (COM5)
2E8h - 2EFh Serial Port #5 (COM6)
360h - 36Fh Network Ports
B. Interrupt Request Lines (IRQ)
Peripheral devices use interrupt request lines to notify CPU for the
service required. The following table shows the IRQ used by the devices
on board.
Level Function
IRQ0 System Timer Output
IRQ1 Keyboard
IRQ4 Serial Port #1
IRQ3 Serial Port #2
IRQ5 Serial Port #3
IRQ11 Serial Port #4
IRQ8 Real Time Clock
IRQ14 Primary IDE
IRQ15 Secondary IDE