Well, you have to draw the bitmap every loop of the program. A "BITMAP" in DB would be better refered to as "image data in memory allocated for offscreen drawing operations". This is very useful for drawing radars or progress meters that required you to draw stuff that would not show on screen at first and retrieving what you have drawn and pasting it onscreen. It's sort of hard for me to explain. Anyway, just don't use db's bitmaps for simple stuff like this. Either use sprites if the image is going to be animated, or images if it is static.
What I suggest you would do is load the background image as a image and paste it everyloop. As for moving the sprite in the do-loop: don't you think you can simplify it down? Anyway, here's my substitution of your code:
rem ---------
rem You should use these commands for a faster and smoother program execution
sync on
sync rate 60
load image "image.bmp",100 : rem Set a range for different types of images
load image "sprite1.bmp",1
sprite 1,0,0,1
do
rem Paste the background
paste image 100,0,0
rem Simplified sprite movement
if upkey()=1 the move sprite 1,3
if downkey()=1 the move sprite 1,-3
sync:loop
rem ----------
Sorry, if that confused you a bit, but I hope it helps.
Vs
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BBoy VietStylist 1.9k'86
