An interrupt that starts with a busy-wait for the intended HPOS can be predictably triggered for a minimum busy-wait on 68000. Should you have a fast CPU you waste part of a scanline busy-waiting, but on the other hand if the game runs on A500 the CPU can waste that time and still be able to run the game. A good method to know when you are A500-centric (write for the A500 platform specifically) but don't want to rule out faster Amigas.
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