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(+1)

When using the ROM routines you need to open the channel to display things on the bottom two lines.  Putting 0 or 1 into the accumulator and calling 5633 will do the job.  When you want to display on the rest of the screen, call 5633 with 2 in the accumulator.

Thanks!

Now the tiles appear to be scrolling from the bottom and disappearing when they touch the top of the screen.

I don't understand what you're trying to do.  If you want to scroll the screen just call the ROM routine at 3582

I put 0 in accumulator and called 5633 and this is what happened.

(the same thing happens when I put 1)

What I'm trying to do is be able to put UDGs and text on the bottom of the screen without the "scroll?" thing ruining it.

(+1)

Once you've opened the lower screen for printing, make sure you reset the cursor position to the top left.  Printing chr$ 22, chr$ 0 and then chr$ 0 will do that.  Then you should be able to put another 64 characters in the bottom panel.  Don't go beyond that or that part of the screen will scroll up