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## 9 BIOS port memory map

Start | End | Usage
--- | --- | ---
0 | 0x1000 - 1 | BIOS and real mode interrupts
0x07BE | 0x07FF | Partition table passed to another boot loader
? | 0x2000 - 1 | Real mode stack
0x7C00 | 0x7D00 - 1 | Boot sector
0x8000 | ? | GRUB kernel
0x68000 | 0x71000 - 1 | Disk buffer
? | 0x80000 - 1 | Protected mode stack
? | 0xA0000 - 1 | Extended BIOS Data Area
0xA0000 | 0xC0000 - 1 | Video RAM
0xC0000 | 0x100000 - 1 | BIOS
0x100000 | ? | Heap and module code