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04-25-24 08:23 AM |
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| 0 users currently in ROM Hacking | 2 guests |
| Main - ROM Hacking - Possible N8 Everdrive modification, for larger chip support | New thread | New reply |
| infidelity |
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 Fuzz Ball Level: 66 Posts: 926/968 EXP: 2367842 Next: 94009 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Over the past few years, I've been in contact with the creator of the Everdrive devices, known as "krikzz". My conversations have been based around his usage of 512kb sram chips, for the PRG & CHR-ROMS of the N8 device. This size limit, eliminates the possibility for larger game support, particularly my personal interest, 2mb MMC5 games. With the advancements over the years in perfecting proper emulation for this mapper, on FCEUX, Nestopia, & Nintendulator, plus the knowledge of functionality from well experienced hackers, (kuja killer, Matrixz, & myself, *myself largely due to the previously 2 mentioned*) I feel it has come to the point that flashcarts should be able to implement full mmc5 usage.
Krikzz has confirmed that larger chip support is possible, it requires a firmware update, and a hardware modification aside from the removal/swapping of the smaller to larger sram chips. He has informed me on the locations on the motherboard, to allow the mmc5 mapper to read a larger size over 512kb. At some point, I will purchase the N8, and attempt to perform the hardware modifications. If I have trouble, I'll try to find someone and pay them to do the mods on the flashcart for me. Krikzz made one other note, that the mmc5 emulation is not perfect. I've asked if he'd be willing to share the mmc5 code, and see if there is anyone that would be willing to expand on the code further, for proper emulation as we see on the 3 major pc emulators. That's all the information I have at this time. If more developes, I'll update everyone. :-) |
| infidelity |
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Fuzz Ball Level: 66 Posts: 928/968 EXP: 2367842 Next: 94009 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Update.
krikzz released the mmc5 source code for the fpga chip on the N8 Everdrive. I hope that someone who is experienced with the fpga, or the files that go with it, would be able to enhance the code further. I'd like to know if any authors of the pc emus FCEUX, Nintendulator, & Nestopia, would be willing to take a look and edit the code? If anyone can redirect those people here, I will give more info. But this is going to happen, I'm purchasing the N8 Everdrive, & the larger 1024kb chips, and Ben Boldt has been gracious to offer assistance in the hardware modifications to the N8 device! That's all for now. :-) |
| infidelity |
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Fuzz Ball Level: 66 Posts: 930/968 EXP: 2367842 Next: 94009 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Update.
I've purchased the N8 Everdrive, & the 1024kb chips. But an even bigger update. lidnariq from nesdev, took the time to look through the mmc5 source code, and stated that KRIKzz already has the mmc5 pretty much all there, and lidnariq was open in revealing the needing of minor additions/small changes. Everything is looking very good so far, Ben Boldt on hardware, and now lidnariq on the coding end. That's all for now. :-) |
| infidelity |
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Fuzz Ball Level: 66 Posts: 931/968 EXP: 2367842 Next: 94009 Since: 05-24-07 Last post: 957 days Last view: 813 days |
Update.
Well, I'm now at a roadblock with no timeframe to when I can go further. lidnariq revealed that the OS needs to be adjusted. I asked KRIKzz if he would be willing to share the source, and he refused (which I respect and understand). So I asked if he would make the change himself for me in the OS. I'm assuming he looked through it, stated it is too much work for 1 custom cart. It is very unfortunate, and I would've never purchased the cart knowing this OS issue at the time. So, Ben Boldt is still going to perform the hardware mod on the everdrive, then I need to find someone with FPGA experience, that will adjust the mmc5 source files for me, so that my cartridge can at least be at that state. I didn't want to keep pressing him on the subject, but I feel this isn't just for 1 custom cart. The blueprints have been laid out for anyone, on how to do this mod. It's unfortunate that he went this far with giving the mmc5 source, figuring the hardware schematic, only to be stopped by his undesired feelings on adjusting the OS. So that's where the project stands now. |
| Main - ROM Hacking - Possible N8 Everdrive modification, for larger chip support | New thread | New reply |
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