CR5E
unsigned char CR50, CR51, CR53, CR55, CR58, CR5B, CR5D, CR5E;
reg->CR5E = (((timings.VTotal - 2) & 0x400) >> 10) |
vga_out8(0x3d5, reg->CR5E, par);
reg->CR5E = vga_in8(0x3d5, par);
vga_out8(0x3d5, reg->CR5E, par);