mga_writeb
mga_writeb(minfo->video.vbase, 0x0000, 0xAA);
mga_writeb(minfo->video.vbase, 0x0800, 0x55);
mga_writeb(minfo->video.vbase, 0x4000, 0x55);
mga_writeb(vbase, uaddr, (mga_readb(vbase, uaddr) & 0x0F) | bgx2);
mga_writeb(vbase, uaddr, (mga_readb(vbase, uaddr) & 0xF0) | bgx2);
mga_writeb(vm, offs, 0x02);
mga_writeb(vm, offs, mga_readb(vm, offs) - 0x02);
mga_writeb(vm, offs2, *tmp++);
#define mga_outb(addr,val) mga_writeb(minfo->mmio.vbase, (addr), (val))