VGA_ATC_PLANE_ENABLE
vga_wattr(state->vgabase, VGA_ATC_PLANE_ENABLE, ch512 ? 0x07 : 0x0f);
vga_wattr(cinfo->regbase, VGA_ATC_PLANE_ENABLE, 0x0f);
svga_wattr(regbase, VGA_ATC_PLANE_ENABLE, 0x0F);
par->atc[VGA_ATC_PLANE_ENABLE] = 0x0F;
atc[VGA_ATC_PLANE_ENABLE] = 0x0F;