You have a maximum of 32 bitmaps (as in
LOAD BITMAP,
CREATE BITMAP, the first one being the screen).
The limit to images (as in
LOAD IMAGE,
GET IMAGE etc) is probably far higher than your project needs or your system can manage.
Quote: "How do I load a 512 x 512 image and then grab a 'tile' from that image and then paste it to the screen?"
You would
LOAD BITMAP, then
GET IMAGE followed by the image number, coordinates and texture flag.
PASTE IMAGE does the next bit, although making it a
SPRITE is more versatile.
If your image has transparent (or semi-trannsparent) areas, then
SET BITMAP FORMAT 21 before loading it to retain the transparency.