CME34M Hardware Manual - RTD Embedded Technologies, Inc.
CME34M Hardware Manual - RTD Embedded Technologies, Inc.
CME34M Hardware Manual - RTD Embedded Technologies, Inc.
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Memory Map<br />
Table 38 shows how memory in the first megabyte is allocated in the system.<br />
Table 38<br />
First Megabyte Memory Map<br />
Address (hex)<br />
Description<br />
C0000–FFFFFh ROM<br />
C0000–EFFFFh<br />
A0000–BFFFFh<br />
00502–9FFFFh<br />
256 KB BIOS in Flash EPROM, shadowed into DRAM during runtime.<br />
Run time user memory space. Usually, memory between C0000h and CFFFFh<br />
is used for the BIOS of add-on VGA video cards.<br />
Normally used for video RAM as follows:<br />
EGA/VGA<br />
Monochrome<br />
CGA<br />
DOS reserved memory area<br />
00400–00501h BIOS data area<br />
00000–003FFh<br />
Interrupt vector area<br />
0A0000–0AFFFFh<br />
0B0000–0B7FFFh<br />
0B8000–0BFFFFh<br />
Memory beyond the first megabyte can be accessed in real mode by using EMS or a similar memory manager.<br />
See your OS or programming language references for information on memory managers.<br />
56 <strong>CME34M</strong> cpuModule BDM-610000076 Rev A
Change language