_vga_attr_read|_vga_attr_read
_vga_attr_write|_vga_attr_write
_vga_gdc_read|_vga_gdc_read
_vga_gdc_write|_vga_gdc_write
_vga_ts_read|_vga_ts_read
_vga_ts_write|_vga_ts_write