It's been far too long since anyone has posted on this forum, so here's something some of you might find interesting.
I had a go at implementing the 16 pixel left border STE-only overscan method (discussed elsewhere on the forum) in STOS. It works! And it is as easy as anything.
Find attached a source. All this example does is write a one bitplane, 16 pixel-wide message in the left border. You'll need the Missing Link extension for this (as well as the latest version of STOS from exxos's website - this is STE only, remember?), but this is just because I've used the kopy command through laziness. The actual overscan routine is pure STOS, and doesn't use any STE extensions or commands.
Top border next
Tom.
)