U1MB, Incognito, SIDE2, SIDE3, 1088XEL/XLD Firmware 4.0 Released in Atari 8-Bit Computers Posted 1 hour ago 1 hour ago, Wrathchild said: For games that use their own SIO routines you will have to source a patched/cracked version. For the Lucas Arts' titles you can use cartridge based versions, e.g. here. Though you are best of loading these into Altirra first and then saving as a 'car' file to assist the SIDE3 cart by stating the mapper to use. OK, just tested Eidolon, Koronis Rift and Gauntlet with Side3. Maxflash works great but Megacart does not. Like you suggested, I have loaded ROMs in Altirra and then exported them as CAR.