////////////////////////////////////////////////////////////////

void ROMPrintChar( char c, int x, int y, int color, int transp ) {

   long destOffset;
   long srcOffset;
   int i, j;
   unsigned char bitMask, charRow;

   srcOffset = ROM_CHAR_SET_OFF + (c*ROM_CHAR_HEIGHT);
   destOffset = VIDEO_OFFSET + x + (y<<6) + (y<<8);

   // draw each row of the character
   for(j=0; j<ROM_CHAR_HEIGHT; j++) {

      // reset bitmask
      bitMask = 0x80;

      // get rom data from dos area
      __asm__( "
               pushw %%ds              \n
               movw %%bx, %%ds         \n
               movb %%ds:(%%esi), %%al \n
               popw %%ds               \n

               ": "=a" (charRow)
               : "b" (_dos_ds), "S" (srcOffset)
      );

      // draw this row of the char
      for(i=0; i<ROM_CHAR_WIDTH; i++) {

         // draw the pixel if bit is 1
         if(bitMask & charRow) {

            __asm__( "
                     movw %%bx, %%es   \n
                     stosb             \n
                     ":
                     : "a" (color), "b" (_dos_ds), "D" (destOffset+i)
            );
         } else if (!transp) {

           __asm__( "
                    movw %%bx, %%es    \n
                    stosb              \n
                    ":
                    : "a" (0), "b" (_dos_ds), "D" (destOffset+i)
           );
         }

         // move to the next bit
         bitMask>>=1;
      }

      // move to the next row in each buffer
      srcOffset++;
      destOffset += SCREEN_WIDTH;
   }
}

////////////////////////////////////////////////////////////////