added another hack that can be used to force standard mode 0x13 to 320x240x256 using the VESA BIOS.
added another hack that can be used to force standard mode 0x13 to
320x240x256 using the VESA BIOS.

joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib,joncampbell123/doslib