VGA_CRTC_CLAL
vga_set_crtc(VGA_REG_ADDR, VGA_CRTC_CLAL, addr & 0xff);
vga_get_crtc(VGA_REG_ADDR, VGA_CRTC_CLAL);
vga_set_crtc(VGA_CRTC_CLAL, off & 0xff);
off = (vga_get_crtc(VGA_CRTC_CLAH) << 8) + vga_get_crtc(VGA_CRTC_CLAL);
vga_set_crtc(&console->vga.regs, VGA_CRTC_CLAL, addr & 0xff);
vga_get_crtc(&console->vga.regs, VGA_CRTC_CLAL);