How do you implement memory allocation

[Blqtent]

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[nanochess]

The memory allocation is based on a gentleman's agreement. 0x7c00-0x7dff is where boot sectors are loaded, and before that no one typically uses the space. So BootOS relocates on 0x7a00-0x7bff and uses a few more bytes. So user programs are loaded like a boot sector and can use any of the memory onwards.