Madi Posted August 25, 2014 Share Posted August 25, 2014 (edited) I tried do modify the 600XL-800XL (OS ROM) with a disk editor to make it compatible with MyDOS - Ultra-speed utility. I modified the area CC00 - CE98 which is allocated for the International character set. I tested the modified ROM using Altirra. I got the following bad ROM image and never pass it : Are the Atari's XL OS ROMS tested for a checksum identification upon run? or only for some parts/locations of the OS ? Why does copying ROM to ram and then saving them back as ROM succeed although they may be altered ( e.g.The Translator)? madi Edited August 25, 2014 by Madi Quote Link to comment Share on other sites More sharing options...
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