1. ?
2. Except a few edge cases (there's no such thing as LDA $000000,y, for example), they're pretty much the same. Also you've got to watch out for what the routines you're hijacking are using; blocks store part of the "acts like" setting in Y, so you need to preserve it somehow if you want to use it in a block's code.
2. Except a few edge cases (there's no such thing as LDA $000000,y, for example), they're pretty much the same. Also you've got to watch out for what the routines you're hijacking are using; blocks store part of the "acts like" setting in Y, so you need to preserve it somehow if you want to use it in a block's code.