/************************************************************************/
/* Display 512 different characters at a time                           */
/************************************************************************/

print_512_chars()
        {
        #define MONO    5
        #define VMONO   7
        #define ON      1               /* Flag values                  */
        #define OFF     0
        static  char    buffer[256][32];/* Buffer for char gen          */
        int     i, j;

        /*--- Set default text mode                                     */

        if (get_display_type() == VMONO ||
            get_display_type() == MONO) set_mode(7);
        else                            set_mode(3);

        /*--- Download a second 256 character set                       */

        read_char_gen(buffer);          /* Read old character generator */
        for (i = 0; i < 255; i++)       /* Create a new char set        */
                for (j = 0; j < 4; j++) /* from the old by 'italisizing'*/
                        {
                        buffer[i][j] = buffer[i][j] >> 1;
                        buffer[i][j+10] = buffer[i][j+10] << 1;
                        }
                                        /* Download new char gen        */
        write_char_gen(buffer, 512, 256);

        /*--- Enable the 512 character set generation                   */

        enable_second_set();            /* Enable 512 char set          */

        /*--- Display 512 characters and attributes                     */

        for (i = 0; i < 256; i++)       /* Display chars 0 - 255        */
                {
                write_attribute(i/64, i%64, 0, 7);
                write_char(i, i/64, i%64);
                }

        for (i = 0; i < 256; i++)       /* Display chars 256-512        */
                {
                write_attribute(4 + i/64, i%64, 0,15);
                write_char(i, 4 + i/64, i%64);
                }

        /*--- Wait for <Enter> and then disable the second character set*/

        getchar();
        disable_second_set();
        }