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1ST MB MEMORY ADDRESS MAP
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Memory Address Description
00000-9FFFF System Memory
A0000-BFFFF VGA Buffer
C0000-CBFFF VGA BIOS
D6000-D7FFF DOC 2000
E0000-FFFFF System BIOS
1000000- Extend BIOS
I/O MAP
I/O Address Range Description
000-01F DMA Controller #1
020-021 Interrupt Controller #1, Master
040-05F 8254 Timer
060-06F 8042 (Keyboard Controller)
070-07F Real time Clock, NMI
(non-maskable interrupt) Mask
080-09F DMA Page Register
0A0-0BF Interrupt Controller #2
0C0-0DF DMA Controller #2
0F0 Clear Math Coprocessor Busy
0F1 Reset Math Coprocessor
0F8-0FF Math Coprocessor
1F0-1F8 Fixed Disk
200-207 Game I/O
278-27F Parallel Printer Port 2 (LPT3)
2E8-2EF Serial Port 4
2F8-2FF Serial Port 2
300-31F Prototype Card
360-36F Reserved
378-37F Parallel Printer Port 1 (LPT2)
380-38F SDLC, Bisynchronous 2
3A0-3AF Bisynchronous 1
3B0-3BF Monochrome Display and
Printer Adapter (LPT1)
3C0-3CF Reserved
3D0-3DF Color/Graphics Monitor Adapter
3E8-3EF Serial Port 3
3F0-3F7 Diskette Controller
3F8-3FF Serial Port 1
443 Watchdog Timer Enable
043 Watchdog Timer Disable
25 Board Configuration