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Post by arcadetv on Feb 5, 2016 18:42:46 GMT -5
You should gather some info on the technique called 'bankswitching'. In short: when you put two 8mbit games on a 16mbit eprom by concatenating (in cmd: copy /B rom1.bin+rom2.bin tworomsInOne.bin) then you can use the highest address-line to chose either the first or the second half of whats visible to the Hardware by connecting the line to either Vcc or GND. If you use the two highest address-lines you can have 4 games each 4mbit on it, but still need to select the games manually. Now, if you use a 'mapper', that's an additional IC that handles this process for you you can talk to it by putting your menu in the first region of your rom. Anything beyond this is above my head i'm afraid.
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Post by arcadetv on Feb 5, 2016 18:28:36 GMT -5
I'm a total n00b when it comes to registers and what happens inside an eprom when the game runs I'm absolutely confident in soldering though.. I can laxout my own pcbs with Eagle and reading schematics is no biggie ^^ but after all this is just a hobby for me. Dunno if it's representative for my experience level but I post quite a lot what's going on on twitter.com/arcadetv Thanks for looking into it!
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Post by arcadetv on Feb 5, 2016 12:24:57 GMT -5
Of course I only removed the mask-roms and left the mapper in place ^^ I used the SEGA pcb, it has the 315-5709. On the Capcom-Board there's jumpers on pins 23 and 24 of the mapper. I know that some carts have only 2 roms and then pin 23 is grounded, also tried that I tried to get an answer in krikkz forum but no luck yet: krikzz.com/forum/index.php?topic=1732.0I'm totally willing to buy a SSF2 on eBay and have it send to you (or just give you the money to buy one) because I really would love to get this to work. Thanks!
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Post by arcadetv on Feb 5, 2016 9:14:26 GMT -5
I tried to create a muti-rom with krikzz' multirom-tool and put it on a 27C160 and mounted it on a SSF2 cart pcb after removing the SOP44 roms. The tool is supposed to split all input-files into 512k-pieces and I thought it was compatible with the mapper but infact it is not.. The Menu comes up but it just jumps back to game-selection so I believe it is not the same as SSF2 uses the mapper. Here's the tool: krikzz.com/pub/support/everdrive-md/v3/tools/I'm running out of ideas and you guys seem to have the right know-how... I would really appreciate if somebody could confirm that krikzz' menu is using the same registers for bankswitching like SSF2 and if not, maybe some kind of patch could be applied to make it work on the hardware. I even stripped both my SSF2 carts and added them to the stripClub, that's a project of mine where I provide hires scans of naked hardware: stripclub.arcade.tv.de/Also I made this pinout: Thanks guys!
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