DFI 586ITBD, User Manual

Page: 80 / 89

586ITBD System Board User’s Manual
B
80
Memory Address Map
Address Name Function
0000000 to 640KB System System Board Memory
009FFFF Board RAM
00A0000 to 128KB Video Reserved for Graphics
00BFFFF Display Memory Display Memory
00C0000 to 160KB I/O Reserved for ROM on
00E7FFF Expansion ROM I/O Adapter Card
00E8000 to 96KB ROM on System Board BIOS
00FFFFF the System Board
0100000 to Maximum System Board Memory
FFFFFFF Memory 256MB
I/O Address Map
I/O Address Function
0000-001F DMA Controller 1, 8237A-5
0020-003F Interrupt Controller 1, 8259A, Master
0040-005F Timer, 8254-2
0060-006F 8742 (Keyboard Controller)
0070-007F Real-time Clock, NMI
(Non-maskable Interrupt) Mask
0080-009F DMA Page Memory, 74LS612
00A0-00BF Interrupt Controller 2, 8259A
00C0-00DF DMA Controller 2, 8237A-5
00E8 Shadow RAM and Cache Control Bit
00F0 Clear Numeric Processor Extension Busy
00F1 Reset Numeric Processor Extension
00F8-00FF Numeric Processor Extension
01F0-01F8 Fixed Disk
0200-0207 Game I/O
0278-027F Parallel Printer Port 2