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Low-level programming (BIOS/HW)

* I get `Unsupported XXX'
* Passing pointers to data
* _go32_dpmi_simulate_int crashes
* Getting data to/from your program
* movedata causes faults
* How can a real-mode function call me?
* Hardware interrupts
* It still hangs.
* How do I access devices above 1Mb?
* How do I deal with int 24h?

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