I have completed my first Apple-1 board (using "Uncle" Bernie's kit and fixes). Unfortunately, I do not have a proper NTSC-Monitor at hand, so I though I check it using an RCA to HDMI-Converter and hook that one up to my TV.
I see a distorted picture (similar to what you get when you try to watch an NTSC signal on a PAL tv), but I can see the typical underscore/at-character blinking pattern. It looks like this:
If I do not have a "pure" NTSC monitor at hand – does anybody have a suggestions how to test the video?