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You might have been able to store the opcodes in strings, letting BASIC put them in memory somewhere and then getting the address. A cool trick to move your pl
by DidYaWipe 2y ago
You might have been able to store the opcodes in strings, letting BASIC put them in memory somewhere and then getting the address.
A cool trick to move your player/missile graphics vertically in BASIC was to store the sprites in strings, point the sprite's starting memory to the address of the string, and then use string-copying routines in BASIC to move the sprite up & down (since they only had a horizontal-position register; vertically they were as tall as the screen, so you had to blit them to get vertical movement).
- ddingus 2y agoYes, I learned that trick out-of the blue book, de re Atari I believe. Hard to remember. I also used that trick to scroll one of the lower resolution graphics screns for a brick out type game that would inch whatever was left toward the player.