Thomas Jentzsch Posted January 10, 2020 Share Posted January 10, 2020 The known ROM of Boom Bang (HES) clearly contains Motocross too. But there is no way to get Motocross running (without altering the ROM that is). There is some bank switch code inside, but this code cannot work. For other, similar HES multicarts they changed the code. However there are reports (see comments in the link) that people were able to start Motocross. So I am almost 100% sure there must be a 2nd, different ROM existing which has not been dumped yet. So if you have this cart (not the one with the menu) in your collection, please check if you can start Motocross using the right difficulty switch or not and report your results here. Quote Link to comment Share on other sites More sharing options...
Jason_Atari Posted January 11, 2020 Share Posted January 11, 2020 I have 2 copies of boom bang and there is no hidden motocross game. I tried all combinations of difficulty switch settings and color/bw switch and nothing. 2 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted January 11, 2020 Author Share Posted January 11, 2020 Thanks! Seems like the working ROM might be a bit rare. The more Boom Bang HES carts get tested, the better. Quote Link to comment Share on other sites More sharing options...
dark-aleph Posted January 11, 2020 Share Posted January 11, 2020 I couldn't unlock any hidden Motocross on my copy either. Like Jason_Atari I tried all the combos of switches. Quote Link to comment Share on other sites More sharing options...
Nukey Shay Posted January 11, 2020 Share Posted January 11, 2020 Using the switches won't work...the code at $FFF6 to $FFF8 (in both banks) reads BIT.w $00F6 (2C F6 00) instead of what I suspect was supposed to be JMP $F000 (4C 00 F0). Then both games are accessible based on the position of the difficulty switch when powering up the cartridge. Couldn't you get there via "frying"? That ought to lead to a random address in a random bank, right? 1 Quote Link to comment Share on other sites More sharing options...
high voltage Posted January 12, 2020 Share Posted January 12, 2020 Weird, the Neckermann version (2 pak special) works just fine with both games. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted January 12, 2020 Author Share Posted January 12, 2020 (edited) 8 hours ago, Nukey Shay said: Using the switches won't work...the code at $FFF6 to $FFF8 (in both banks) reads BIT.w $00F6 (2C F6 00) instead of what I suspect was supposed to be JMP $F000 (4C 00 F0). Then both games are accessible based on the position of the difficulty switch when powering up the cartridge. Couldn't you get there via "frying"? That ought to lead to a random address in a random bank, right? Yes, I know the code doesn't work (BTW: Fractions of the code can be found at the same place in the menu cart too). But there have been reports that some carts allowed playing Motocross. Frying might be one possibility, a fixed ROM would be the other one. And yes, the multicard with a menu works perfectly, but that one is using completely different code. Edited January 12, 2020 by Thomas Jentzsch Quote Link to comment Share on other sites More sharing options...
0078265317 Posted January 13, 2020 Share Posted January 13, 2020 found this on ebay https://www.ebay.com/itm/Atari-2600-game-2-Pak-Special-Motocross-Boom-Bang-cartridge/382800224986?hash=item5920abe2da:g:K1kAAOSwpBddqaMR Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted January 13, 2020 Author Share Posted January 13, 2020 Thanks, but that's the menu cart. I am looking for the cart without the menu. Quote Link to comment Share on other sites More sharing options...
0078265317 Posted January 14, 2020 Share Posted January 14, 2020 (edited) https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com.au%2Fulk%2Fitm%2F182428951162 https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F173996652475 Edited January 14, 2020 by 0078265317 Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted January 14, 2020 Author Share Posted January 14, 2020 Are you going to buy these or why are you posting the links? Quote Link to comment Share on other sites More sharing options...
+Spriggy Posted January 14, 2020 Share Posted January 14, 2020 @Thomas Jentzsch @Rom Hunter Went to my local lads today and picked up a copy of Boom Bang. Tested, but sadly same result as Jason. Game works with every switch combination, which makes the IMPORTANT message on the label wrong. 1 Quote Link to comment Share on other sites More sharing options...
Nukey Shay Posted January 14, 2020 Share Posted January 14, 2020 Try frying it. Granted...it's only a slim chance here, because (going by the known good dump) the BRK vector is also wrong in the first bank (pointing at Ram instead of Rom). Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted January 14, 2020 Share Posted January 14, 2020 So, the Boom Bang does contain the coding of Motocross, but it doesn't fire up in any way on a console? In that case, I have to change the info on the gamepage. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted January 14, 2020 Author Share Posted January 14, 2020 I still hope there might be a fixed version exist out there. But it seems that the broken (dumped) version is much more common. BTW: Why HES did not actively promote the 2nd games on their working multicarts (Challenge, Wall Defender)? Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted November 22, 2020 Author Share Posted November 22, 2020 Looks like the are a lot of not yet dumped multi game carts in this auction, maybe even the Boom Bang version we are looking for. Also: Pigs 'n' Wolf Star Warrior Maybe someone from Australia is interested? Quote Link to comment Share on other sites More sharing options...
Dionoid Posted August 10, 2022 Share Posted August 10, 2022 [reviving an old thread] I also recently got a HES Boom Bang cartridge, but no matter how I set the difficulty switches, no other game pops up. So it seems I've got another of the regular cartridges. Quote Link to comment Share on other sites More sharing options...
Thomas Jentzsch Posted August 10, 2022 Author Share Posted August 10, 2022 (edited) I have to check the code again. It could depend on the hardware used. Some regular carts always start always in the same and some in a random bank. Edit: Nope, the dumped ROM will always jump to Boom Bang. Edited August 11, 2022 by Thomas Jentzsch 2 Quote Link to comment Share on other sites More sharing options...
Rom Hunter Posted August 21, 2022 Share Posted August 21, 2022 (edited) On 8/10/2022 at 9:50 PM, Thomas Jentzsch said: I have to check the code again. It could depend on the hardware used. Some regular carts always start always in the same and some in a random bank. Edit: Nope, the dumped ROM will always jump to Boom Bang. Ok, I'm going to change the notes of these HES games. Can any of them startup with the UNadvertised game on real hardware? Edited August 21, 2022 by Rom Hunter Quote Link to comment Share on other sites More sharing options...
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