toiletunes Posted April 20, 2014 Share Posted April 20, 2014 Add me to the list please Quote Link to comment Share on other sites More sharing options...
Trebor Posted April 20, 2014 Share Posted April 20, 2014 WOO-HOO! Can't wait to get a copy. Awesome work as always! Quote Link to comment Share on other sites More sharing options...
Trebor Posted April 20, 2014 Share Posted April 20, 2014 The MESS debugger was invaluable for this tracking down all of the bank switch hits. Thanks to the debugger, I found an off-by-1 bug in its initialization code, which caused an indirect address write to try and write to this odd location. Anyway, I'm hoping you guys enjoy this collection. We hand-picked the games to try and included some of the rarer 128k games, based on the feedback from the 1st collection. I'm sure I will enjoy #2 as much as #1...Looking forward to both in-hand Glad to see some very nice dividends being paid from all the MESS work...Very cool 1 Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted April 20, 2014 Author Share Posted April 20, 2014 I believe he actually implemented this new bankswitching method into his local version. 2 Quote Link to comment Share on other sites More sharing options...
edweird13 Posted April 20, 2014 Share Posted April 20, 2014 DO WANT Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 20, 2014 Share Posted April 20, 2014 Did this affect the game at all? The original bug? Not at all. It triggers a false bankswitch with certain hardware, but it seems they worked around it one way or another. In our case we fixed the bug, so the end result is the same. Quote Link to comment Share on other sites More sharing options...
atariguy1021 Posted April 20, 2014 Share Posted April 20, 2014 I'm in! Add me to the list. Quote Link to comment Share on other sites More sharing options...
Stun Runner 87 Posted April 20, 2014 Share Posted April 20, 2014 RevEng and me have done it, it was pretty tricky and I'll let Rev chime in on some of the work he had to go through. But the result is that there is a new bankswitching scheme on this planet. I think we'll call it SC1024, it works by banking in and out entire 128K bankswitched games (bank 0-5 @ $8000, bank 6 @ $4000 and bank 7 @ $C000). Is the shooting game Sentinal on this cart? Quote Link to comment Share on other sites More sharing options...
Marc Oberhäuser Posted April 20, 2014 Share Posted April 20, 2014 Want one! Quote Link to comment Share on other sites More sharing options...
Trebor Posted April 20, 2014 Share Posted April 20, 2014 Is the shooting game Sentinal on this cart? From the screen capture provided in the OP, the games included are: Basketbrawl Ikari Warriors Mean 18 Midnight Mutants Ninja Golf Scrapyward Dog TM Wrestling Water Ski As mentioned earlier there are 8 games which are 128kB each. 128kB x 8 = 1024KB = 1MB - The largest cart currently available (Thanks to CPUWIZ) for the 7800. 1 Quote Link to comment Share on other sites More sharing options...
gambler172 Posted April 20, 2014 Share Posted April 20, 2014 Hi CPUWIZ and also one for me too please......wow,incredible,what you guys do greetings Walter Quote Link to comment Share on other sites More sharing options...
FireTiger Posted April 20, 2014 Share Posted April 20, 2014 Me? I"m I too late already? ... Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted April 20, 2014 Author Share Posted April 20, 2014 Thanks everyone, I made one, but this isn't gonna happen for a while. I need to order more circuit boards from China and I also need more EPROM's. Anyway, here is a quick crappy phone pic... 5 Quote Link to comment Share on other sites More sharing options...
PAC-MAN PRIME Posted April 21, 2014 Share Posted April 21, 2014 Schweeeeet! Quote Link to comment Share on other sites More sharing options...
CPUWIZ Posted April 21, 2014 Author Share Posted April 21, 2014 Yeah, nice job on the label mate. Quote Link to comment Share on other sites More sharing options...
Coleco Posted April 21, 2014 Share Posted April 21, 2014 Put me down for this one, too. Thanks. Quote Link to comment Share on other sites More sharing options...
phoenixdownita Posted April 21, 2014 Share Posted April 21, 2014 (edited) The original bug? Not at all. It triggers a false bankswitch with certain hardware, but it seems they worked around it one way or another. In our case we fixed the bug, so the end result is the same. If I were to put the BIN file on an EPROM on a normal super cart would I trip the bug? Meaning if the super cart is configured to do the usual page 6 @ 4000-7fff then page X @ 8000-bfff then page 7 @ b000-ffff, would I require the fix? Thanks, I am attempting to do the same thing but with a simple dip switch bank, no fancy selection menu, no game patching to bank on 6 bits, simply sharing a 1MByte EPROM with 8 128K games in the crudest of ways. Edited April 21, 2014 by phoenixdownita Quote Link to comment Share on other sites More sharing options...
ColecoGemini Posted April 21, 2014 Share Posted April 21, 2014 Whenever this is ready, I will buy this. Quote Link to comment Share on other sites More sharing options...
tep392 Posted April 21, 2014 Share Posted April 21, 2014 Please add me to the list. Quote Link to comment Share on other sites More sharing options...
UberArcade Posted April 21, 2014 Share Posted April 21, 2014 Awesome! Put me down for a cart when you eventually make them. I don't have many of those games yet so it looks like a great way to play them. Quote Link to comment Share on other sites More sharing options...
RevEng Posted April 21, 2014 Share Posted April 21, 2014 (edited) If I were to put the BIN file on an EPROM on a normal super cart would I trip the bug? Meaning if the super cart is configured to do the usual page 6 @ 4000-7fff then page X @ 8000-bfff then page 7 @ b000-ffff, would I require the fix? I don't know for sure, since I didn't dig any more deeply into it once I fixed the source of the spurious bankswitch and confirmed the game was working. It could just be coincidence, but to me the usage of the 9000 hotspot infers they knew about the spurious bankswitch. The question is, did they work around it in hardware or software? Since the game works in emulation, the workaround could well be in software, and our meta bankswitching scheme doesn't work with their work-around. If the workaround is hardware, then the emulation of Atari bankswitching may not be 100% accurate. I'll be interested to hear how Ninja Golf works once you get your cart running. If you do need to patch it to get it to work, just search for "A9 16 85 7E" in a hex editor, and change the $16 to $15. You'll also need to re-sign the binary. Edited April 21, 2014 by RevEng 2 Quote Link to comment Share on other sites More sharing options...
Umberto Posted April 21, 2014 Share Posted April 21, 2014 I want a couple, thanks Quote Link to comment Share on other sites More sharing options...
phoenixdownita Posted April 21, 2014 Share Posted April 21, 2014 (edited) I don't know for sure, since I didn't dig any more deeply into it once I fixed the source of the spurious bankswitch and confirmed the game was working. It could just be coincidence, but to me the usage of the 9000 hotspot infers they knew about the spurious bankswitch. The question is, did they work around it in hardware or software? Since the game works in emulation, the workaround could well be in software, and our meta bankswitching scheme doesn't work with their work-around. If the workaround is hardware, then the emulation of Atari bankswitching may not be 100% accurate. I'll be interested to hear how Ninja Golf works once you get your cart running. If you do need to patch it to get it to work, just search for "A9 16 85 7E" in a hex editor, and change the $16 to $15. You'll also need to re-sign the binary. Thanks a bunch, will keep you posted once I got all the needed hardware, still waiting for the inverters. Not even sure if only the 32K games need the inverters or also 48K and 128K, I will find out I guess once I attempt. Those supercarts do have other hardware to do the bank selection, not sure if they control OE or /OE. I took a look at the source code of the signer tool, nice little thing, and I discovered that for 144K games the first 32K in the a78 files are the extra 32K (at 0x4000 instead of page6), somehow I would have expected them to be at the back .... always learning something new. Also learnt that in absence of anything else the tool for 128K banked games assumes that page 0 is mapped at 0x8000 at startup (during signature verification) and signature only covers the 48K spanning page 6 [at 0x4000], page 0 [at 0x8000] and page 7 [at 0xc000], for the rest anything goes. Edited April 21, 2014 by phoenixdownita 1 Quote Link to comment Share on other sites More sharing options...
TrekMD Posted April 22, 2014 Share Posted April 22, 2014 Sign me up! Quote Link to comment Share on other sites More sharing options...
+swlovinist Posted April 22, 2014 Share Posted April 22, 2014 Late to the party, but sign me up. This looks great. Quote Link to comment Share on other sites More sharing options...
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