Well, I'm not sure how PSP would do it, but the pencil in Photoshop locks to both guides and grid if you set it up that way (you would do that in the View > Snap To menu). Now if you choose to have a 1x1 grid, it would snap to the grid lines, however that somewhat resembles the default behaviour of the pencil...
What you're probably talking about is the brush, which aliases edges and always gets blurry even at a feather of 0%, which is obviously not suitable for spriting. Try switching to the pencil tool, and play around with that
What you're probably talking about is the brush, which aliases edges and always gets blurry even at a feather of 0%, which is obviously not suitable for spriting. Try switching to the pencil tool, and play around with that