_remappalette() Doesn't Work on Hercules or Olivetti Cards

MS-DOS                      | WINDOWS

The information in this article applies to:

• The C Run-time (CRT), included with:

      - Microsoft C for MS-DOS, versions 5.1, 6.0, 6.0a and 6.0ax
      - Microsoft C/C++ for MS-DOS, version 7.0
      - Microsoft Visual C++ for Windows, version 1.0
  

In Microsoft C versions 5.0, 5.1, 6.0, 6.0a, 6.0ax, C/C++ version 7.0, and Visual C/C++ version 1.0, when trying to remap the default black background color using _remappalette() and _remapallpalette(), neither will work if a Hercules monochrome graphics card is installed.

These functions do not support the Hercules card. On page 488 of the "Microsoft C Optimizing Compiler: Run-time Library Reference" for version 5.1, there is a note stating that _remappalette() and _remapallpalette() work only with an EGA or VGA card. In the online help for C 6.0, 6.0a, 6.0ax, C/C++ version 7.0, and Visual C/C++ version 1.0, there is a note explaining that either of these functions will generate an error if they are called on a system with an Olivetti and Hercules display adapter.