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Internal memory map

- 000000h ------------------------------------
Realmode interrupt vectors
- 000400h ------------------------------------
Pseudo IBM PC BIOS work
- 000500h ------------------------------------
Pseudo DOS work
- 000800h ------------------------------------
DOS user memory

. 080000h .. LOWMEM mode limit ..........

. 0A0000h .. DOS640K mode limit .........

- 0B8000h ------------------------------------

CGA text VRAM

- 0C0000h ------------------------------------

TopView pseudo VRAM (for DOS/V support)

- 0C8000h ------------------------------------

unused (RAM is mapped)

- 0D0000h ------------------------------------

EMS pageframe or unused (RAM is mapped)

- 0E0000h ------------------------------------

unused (RAM is mapped)

- 0F8000h ------------------------------------
Mimic of DOS system file table
- 0FC000h ------------------------------------
DOS static memory
- 0FF000h ------------------------------------
- 0FFFF0h ------------------------------------
Pseudo BIOS ROM
- 100000h ------------------------------------

XMS HMA

- 10FFF0h ------------------------------------
- 110000h ------------------------------------

XMS EMB area
 .
 .
 .
- END OF MEMORY -------------------------------