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Modification of XL-(OS ROM) triggered Memory Test


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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)?





Edited by Madi
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