Troubleshooting
WADE-8016 User’s Manual
5-3
System memory address map
Each on-board device in the system is assigned a set of memory addresses, which also
can be identical of the device. The following table lists the system memory address
used for your reference.
Memory Area
Size
Description
0000 - 003F
1K
Interrupt Area
0040 - 004F
0.3K
BIOS Data Area
0050 - 006F
0.5K
System Data
0070 – 0E2E
54K
DOS
0E2F – 12BE
18K
Program Area
12BF – 9D7F
555K
【
Available
】
First Meg -- Conventional memory end at 630K --
9D80 – 9EFF
6K
Extended BIOS Area
9F00 – 9FFF
4K
Unused
A000 – AFFF
64K
VGA Graphics
B000 – B7FF
32K
Unused
B800 – BFFF
32K
VGA Text
C000 – CEBF
59K
Video ROM
CEC0 -EFFF
133K
Unused
F000-FFFF 64K
System
ROM
HMA
64K
First 64K Extended
Interrupt Request Lines (IRQ)
Peripheral devices can use interrupt request line s to notify CPU for the service
required. The following table shows the IRQ used by the devices on board.
IRQ#
Current Use
Default Use
IRQ 0
System ROM
System Timer
IRQ 1
System ROM
Keyboard Event
IRQ 2
【
Unassigned
】
Usable IRQ
IRQ 3
System ROM
COM2
IRQ 4
NEWMOUSE
COM1
IRQ 5
【
Unassigned
】
Usable IRQ
IRQ 6
System ROM
Diskette Event
IRQ 7
【
Unassigned
】
Usable IRQ
IRQ 8
System ROM
Real-Time Clock
IRQ 9
【
Unassigned
】
Usable IRQ
IRQ 10
【
Unassigned
】
Usable IRQ
