Important Notice

The pages on this site contain documentation for very old MS-DOS software, purely for historical purposes. If you're looking for up-to-date documentation, particularly for programming, you should not rely on the information found here, as it will be woefully out of date.

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  Include:  <dos.h> or <bios.h>
 
  Structure:
 
  struct BYTEREGS
  {
      unsigned char al, ah;
      unsigned char bl, bh;
      unsigned char cl, ch;
      unsigned char dl, dh;
  };