#G-Lock problems
I'm not sure what is going on. This TV adapter should be sending an
electronic sync as stable as a camcorder. Make sure that your VMODE
in DOS is set to 640×480. Otherwise, the black screen on your final
output may be the DOS screen, but the prompt is above the final
viewing area. You can also raise the TOLERANCE tooltype value to
reduce the chance of the G-Lock going to NO VIDEO.