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Memory Map
| address | size | usage | description | | 0x00000 | 1024 Byte | unusable | interupt vector table | | 0x00500 | 1 Byte | read only | The current color attribute byte is saved here. | | 0x00501 | 2 Byte | read only | The return code of the last execution is saved here. | | 0x00503 | 2 Byte | read only | This word saves the current length of the path. | | 0x00505 | 1024 Byte | read only | The current path is saved here. | | 0x01000 | 12288 Byte | unusable | system.sys gets loaded here. It provides all the system calls and should therefor not be overriden. | | 0x04000 | 8 KiByte | unusable | directory cache. A copy of the current working directory gets loaded here for quick access. Gets overriden everytime a the directory is changed. | | 0x06000 | 8 KiByte | unusable | The file allocation table of the current drive gets loaded here. Is required to allow for file and directories to be read. | | 0x08000 | 4 KiByte | read only | strings.sys gets loaded here to allow for language specific error messages etc. Can be accessed by language.asm. | | 0x09000 | 700 KiByte | free for use | A user programm gets loaded at address 0x09000. The programm has then guaranteed access to the space from 0x9000 up to 0xB8000 without destroying the kernel. | | 0xB8000 | 4096 Byte | special usage | Represents the videobuffer for text mode. Everything written to this area is displayed on the screen. The format is: [ even byte | odd byte ] [ ascii char | color attr. ] | | 0xB8FA0 | ??? | undefined | Could be available for use. But BIOSes might put CMOS data or mappings here. If A20 Gate is enabled, this could range up to 0xFFFFF. Probe and use at your own risk. |