AmITX-AL-I
System Resources
39
6. System Resources
6.1. System Memory Map
Table 7: System Memory Map
Address Range (decimal)
Address Range (hex)
Size
Description
(4GB-2MB)
FFE00000 – FFFFFFFF
2 MB
High BIOS Area
(4GB-18MB) – (4GB-17MB-1) FEE00000 – FEEFFFFF
1 MB
MSI Interrupts
(4GB-20MB) – (4GB-19MB-1) FEC00000 – FECFFFFF
1 MB
APIC Configuration Space
15MB – 16MB
F00000 – FFFFFF
1 MB
ISA Hole
1MB -15MB
100000 - EFFFFF
14MB
Main Memory
0K –1MB
00000 – FFFFFF
1MB
DOS Compatibility Memory
6.2. I/O Map
Table 8: I/O Map
Hex Range
Device
020-02D and 030-03D
Interrupt controller 1, 8259 equivalent
02E-02F
Motherboard resource
040-043 and 050-053
System Timer
04E-04F
Motherboard resource
060, 064
8742 equivalent (keyboard)
061, 063, 065, 067
NMI control and status
070-077
Real Time Clock Controller ( bit 7 -NMI mask)
092
Reset (Bit 0)/ Fast Gate A20 (Bit 1)
0A0-0B1 and 0B4-0BD
Interrupt controller 2, 8259 equivalent
0B2 and 0B3
Motherboard Resource
2E0-2E7
Serial Port 6
2F0-2F7
Serial Port 5
2E8-2EF
Serial Port 4
2F8-2FF
Serial Port 2
3E8-3EF
Serial Port 3
3F8-3FF
Serial Port 1
378-37F
Available
380-3AF
Available
400-47F
Motherboard Resource
4D0
Master PIC Edge/Level Trigger register
4D1
Slave PIC Edge/Level Trigger register
Summary of Contents for AmITX-AL-I
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