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I was playing with rotations on a coco 3 and decided to cook a little SG version for you all....

rotating zooming chessboard...

enjoy

you would do well to hard reset the machine after running it if your using DOS, as the screen area is a little unsafe ($400..$c00)

http://www.roust-it.dk/coco/rotozoom/rotosg.asm

http://www.roust-it.dk/coco/rotozoom/rotosg.bin

Hi Simon,
sorry, I have not been on FB today ....
Very nice indeed and really fast for a machine at 0,89MHz
Thanks a lot for sharing the sources too!

cheers
pere

thx Pere...

i twiddled the routine a little so now it's 12288 cycles faster....

/Simon

That is really fast. Very nice!