GDRI

there's little reason it should be, unless it uses kernal functions since the max didn't have a kernal?

My understanding is that the C64 can run some Max Machine games, and maybe even vice versa. https://monochromeeffect.org/wp/en/2017/11/03/max-machine-is-alive-2/ …

yeah; there's some weird cartridge port things that make things not quite compatible that being said, TOSEC seems to only have a subset of MAX Machine cartridge dumps, so ???? Clowns (1982)(Commodore - Midway) Omega Race (1982)(Midway) Radar Rat Race (1982)(Commodore)

I can't even find any pictures of Sea Wolf on Max Machine (cart, box), so I don't know if it actually came out. Jupiter Lander seems to be the same on both machines as well.

Radar Rat Race actually is the same on both machines, except for one single changed byte that has to do with the settings for the I/O ports in the 6510 (which probably explains why Max Machine games don't always work on the C64?) currently comparing VIC-20 and MAX versions

okay, I suspect that C64 Radar Rat Race is just an updated VIC-20 Radar Rat Race with some code rearranged as a side effect of the porting process however, I do not know if that means it was done by HAL themselves or by Commodore, since the Rally-X->RRR conversion was at CBM USA

as for the other games, I'm currently at a loss; they all seem different to me, but I'm not fine tuned to how the different codebases really differ; I can try doing a bgrep through both VIC-20 and C64 cartridge, binary, and prg archives in the meantime

I'm not sure if that's necessary, but thank you again.