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Kickstart 1.2 problems are more often caused by the programmer saying "I know that DoIO is at $f9abce in the ROM so rather than calling jsr DoIO(a6) I'll be clever and put jsr $f9abce instead"
Kaboom on anything other than that exact ROM...
Either that or they load the game into a low memory position that was no longer free memory in KS1.3+
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