Jrex plus lx user's guide – Kontron JRexplus-LX User Manual
Page 49
KTD-S0001-C
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Appendix A: System Resources
JRexplus LX User's Guide
A.2
Direct Memory Access (DMA) Channels
DMA #
Used for
Available
Comment
0
Yes
1
(LPT1)
Yes
Note (2)
2
Floppy Controller
No
Note (1)
3
(LPT1)
Yes
Note (2)
4
Cascade
No
5
No
Note (3)
6
No
Note (3)
7
No
Note (3)
Note:
1)
If the
Used for device is disabled in the BIOS Setup the corresponding DMA channel is free.
2)
Possible setting for LPT1 if configured for ECP mode.
3)
16 bit DMA channels not available.
A.3 Memory
Area
The first 640 kB of DRAM are used as main memory. DOS can address 1 MB of memory directly. Memory area
above 1 MB (high memory, extended memory) is accessed under DOS via special drivers such as HIMEM.SYS.
Other operating systems (Linux or Windows
®
versions) allow you to address the full memory area directly.
Memory Range
Used for
Available
Comment
C0000h - C7FFFh
VGA BIOS
No
C8000h - CFFFFh
Yes
if onboard graphic controller is used
D0000h - DFFFFh
Yes
E0000h - FFFFFh
System BIOS
No