Looking very good! You must be very proud! It's probably a similar feeling to what I had when I got TF to compile code for the first time. I was like "Look! It's a compiler, and I wrote it!"
Hmmm.... Those old monitors are lovely, but they are very old and can no longer be considered reliable.
My advice is to fit an F18A into your console, then you can use any VGA monitor, LCD monitor, or LCD TV and the picture quality is fantastic. It is the best upgrade for any console. Oh, and you get 80 column mode, plus many other advantages!
Ah! Okay that sounds pretty interesting. Well, when you get around to putting it in a ROM let me know. I have some tools that can make it easier for you and I can give you some advice re ASM994A - I have used it for Turboforth since day 1 with no issues at all.
There's a bit of a Forth renaissance at the moment in our little 4A world. All good!