Can anyone explain this PET command?
Posted: Sun Dec 26, 2021 1:03 pm
I got a PET 4032 about a month ago (used these at school and have always wanted one), and I've noticed that a few programs make the screen larger vertically. I'd just re-sized the screen with the pot on the screen's board, then I saw this happen with some software (luckily, it's only the corners of the corner characters that are slightly off the screen when expanded like this), but I wondered what was going on.
I've just found a game that does this and found the command:
PRINT "NH"
The N and H are in reversed video. Usually these are created by opening quotes then doing a control character, but I wasn't sure what creates those, so just types a reversed NH, then put the print around it and the screen flickered and went bigger.
What exactly is this? Is it a documented feature, a hack, something related to the killer poke, an equivalent to a normal poke command?
Is it safe to use?
Is it something that was meant for a different model PET?
If there is a PET forum somewhere that anyone knows of, then please direct me to it.
I've just found a game that does this and found the command:
PRINT "NH"
The N and H are in reversed video. Usually these are created by opening quotes then doing a control character, but I wasn't sure what creates those, so just types a reversed NH, then put the print around it and the screen flickered and went bigger.
What exactly is this? Is it a documented feature, a hack, something related to the killer poke, an equivalent to a normal poke command?
Is it safe to use?
Is it something that was meant for a different model PET?
If there is a PET forum somewhere that anyone knows of, then please direct me to it.