10/ System Resources; Legacy Interrupt Request (Irq) Lines; Memory Area; Table 21: Legacy Irq Lines - Kontron COMe-cDV7 User Manual

10/ System Resources

10.1. Legacy Interrupt Request (IRQ) Lines

The following table specifies the device connected to each Interrupt line or if the line is available for new devices.

Table 21: Legacy IRQ Lines

IRQ General Usage
1 Timer
2 Keyboard
3 Redirected secondary PIC
4 PCI devices
5 PCI devices
6 LPT2/PCI devices
7
FDD
8
LPT1
9
RTC
10 SCI / PCI devices
11
COM2
12
COM1
13
PS/2 mouse
14 FPU
15 IDE0
[1]
COM1 and COM2 IRQ are valid only for Windows OS. For Linux non-legacy IRQs are used, IRQ16(COM1) and IRQ17(COM2).
Configuration is done via „Advanced -> OS Selection" BIOS option

10.2. Memory Area

Main memory consists of the first 640 kB of DRAM (0000-0000 0009-FFFF). Use DOS to address the 1 MB of system
memory directly using special drivers such as HIMEM.SYS and EMM386.EXE, which are part of the operating system.
Refer to the operating system documentation or special textbooks for information about HIMEM.SYS and EMM386.EXE.
Other operating systems (Linux or Windows versions) allow you to address the full memory area directly. The following
table specifies the usage of the address ranges within the memory area.

Table 22: Designated Memory Locations

Address Range (hex)
DOS DRAM 0 to 1 MB
0000-0000 0009-FFFF
000A-0000 000B-FFFF
000C-0000 000D-FFFF
000E-0000 000E-FFFF
000F-0000 000F-FFFF
Lower Dram - 1MB to TOLUD (Top of Lower Usage DRAM)
00F0_0000 0100-0000
Lower MMIO TOLUD (Top of Lower Usage DRAM) to 4 GB
www.kontron.com
[1]
[1]
Size Project Usage
640 KB DOS (memory)
128 KB VGA (A Segment and B Segment
128 KB DRAM (C Segment and D Segment)
64KB
Extended System BIOS
64 KB
System BIOS upper F segmen
1MB System memory (Low DRAM). This range is always mapped the DRAM .
Project Usage
Timer
Keyboard (SuperIO)
Redirected secondary PIC
Free for PCI devices
Free for PCI devices
One of COM3+4
One of COM3+4 or not used
LPT1 or one of COM3+4
RTC
Free for PCI devices
[1]
COM2
[1]
COM1
PS/2 mouse (or free for PCI devices)
FPU
Not used
[1]
[1]
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COMe-cDV7 - User Guide, Rev 1.0
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