User`s guide

T-MOPSlcdSA User's Guide
Appendix A: System Resource Allocations 38
3
8
18.4 Memory Map
The T-MOPSlcdSA processor module can support up to 32MB of memory. The first 640KB of DRAM
are used as main memory.
Using DOS, you can address 1MB of memory directly. Memory area above 1MB (high memory,
extended memory) is accessed under DOS via special drivers such as HIMEM.SYS and EMM386.EXE,
which are part of the operating system. Please refer to the operating system documentation or
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.
Upper Memory Use Available Comment
A0000h – BFFFFh VGA Memory No Mainly used by graphic adapter cards. If a PCI graphics
card is in the system, this memory area is mapped to the
PCI bus.
C0000h – C8FFFh VGA BIOS No
CC000h – EFFFFh Yes Free for ISA bus or shadow RAM in standard
configurations.
If onboard LAN RPL ROM is enabled, JRC is used, or
LCD-matrix support is enabled, a 16K block is shadowed
for BIOS extensions, starting with first free area at
C8000h, CC000h, D0000h, D4000h, D8000h, DC000h,
E0000h, E4000h, E8000h or EC000h. (BIOS extensions
do not use the whole shadow block.)
F0000h – FFFFFh System BIOS No