Function            isCGA - is Color Graphics adapter installed
                       isEGA - is Enhanced Graphics adapter installed
                       isHerc - is Hercules Graphics adapter installed
                       isMDA - is Monochrome adapter installed

                       ismono - is monochrome display
                       iscolor - is color display

  Syntax              boolean isMDA(void);
                      boolean isCGA(void);
                      boolean isEGA(void);
                      boolean isHerc(void);

                      #include <video.h>
                      ismono()
                      iscolor()

  Prototype in        video.h

  Remarks             is...() check if a video adapter is present.
                      ismono() checks if the display is mono.
                      iscolor() checks if the display is color.

                      The ismono() and iscolor() are macros. Use them if
                      you wish to check what attributes to use (underline
                      or red?) and use the adapter functions (isEGA,
                      etc.) for adapter specific tests.

  Return value        these functions return TRUE if the video adapter or
                      type, as the case may be, is present. Otherwise
                      they return FALSE.

  See also            video.h

  Example             #include <video.h>

                      main()
                      {
                           if (ismono())            /* monochrome */
                                if (isHerc())
                                     printf("Hercules");
                                else
                                     printf("MDA");
                           else                /* color */
                                if (isEGA())
                                     printf("EGA");
                                else
                                     printf("CGA");
                      }