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I searched on google but found nothing for assembly bootloader just for msdos and dos box. I need to make the pc speaker beep in assembly at a frequency and time and then pause and repeat note i am big noob with assembly

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  • `in` / `out` or non-DOS `int` calls should work the same in a legacy BIOS bootloader environment as from a DOS executable. (i.e. any `int` other than `int 21h`) – Peter Cordes Aug 07 '21 at 03:49
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    The speaker is attached to one of the timer (8253) channels. You need to set the count register to correspond to your beep frequency. Find a PC/AT hardware reference manual. – mevets Aug 07 '21 at 04:26
  • Margaret's answer on [Assembly 8086 - DOSBOX - How to produce beep sound?](https://stackoverflow.com/q/43996835) has code that only uses a DOS call to exit. It should drop in to any example BIOS MBR bootloader, at least one that correctly uses `org` and makes DS is set to match. (Remove the CS: overrides to use the correctly-set DS). – Peter Cordes Aug 07 '21 at 05:09
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    Or [generate sound on the legacy PC speaker with OUT instructions](https://stackoverflow.com/q/43000350) has a bootloader example. – Peter Cordes Aug 07 '21 at 05:12

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