Memory mapping of Conventional, Upper and Extended Memory

 

8 MB

 

 

 

 

Extended
 
 

 

 

 

 

 

 

 

 

 

 

 

 


RAM

 

 

 

32 Bit Application Data

 

32 Bit Application

32 Bit BIOS and device drivers

Portion of OS

 

 

 

1024 MB

 

 

 

Upper
 
 

 

 

 

 

 

 

ROM

 

 

RAM

 

ROM

 

ROM

 

RAM

 

System BIOS and Startup BIOS

 

16 Bit Sound Card Device Driver

16 Bit Network Card BIOS

 

16 Bit Video ROM

 

16 Bit Video RAM

 

640KB

 

 

 

 

 

 

Conventional
 
 

 

 

 

 

 

 

 


0 KB

 

 

 

 

 

 

 

RAM

 

 

16 Bit application data

 

16 Bit application

 

16 bit mouse device driver

 

 

Operating System

 

 

 

Data used by BIOS and OS