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Pre-production Harmony cart won't run Summer/Winter/California Games

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Revisiting the Atari 2600...my "pre-production special edition" Harmony cart #42 runs everything it's supposed to except these three Epyx titles; all crash out to no signal immediately after loading. At first I thought BIOS 1.05 might be to blame, but updating to BIOS 1.06 made no difference. ROM images run fine in Stella. BIOS and ROMs are the NTSC versions. The console is an NTSC light sixer. Any ideas as to what could be wrong?

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