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Old 14 September 2015, 19:03   #4
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 20,655
Most common reason for being only KS 1.2 compatible is direct jump to ROM level 3 interrupt routine. (Probably because use of absolute addresses was normal on the C64..). It is very rare, fortunately.

Green stuff is real A1200 confirmed.
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