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  • Konami hornet revival

    neocps1 - - Project Showcase

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    thank you !

  • Konami hornet revival

    neocps1 - - Project Showcase

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    Here is the dual mode switch I made for gradius (works on any other hornet game) : The gradius 4 eprom content (4 MB / 27C322) : mediafire.com/file/8zz7vsk8a53clga/gradius4.bin gradiu10.png

  • Konami hornet revival

    neocps1 - - Project Showcase

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    Here is the complete PowerPC toolchain to compile this : PowerPC toolchain To make the rom, you have to unzip the nba play by play romset in your mame roms directory (roms\nbapbp). Then update the compile.bat in the PowerPC bin directory to change the paths. Update m48t58_data in hboot.s with the RTC content you want, run compile.bat and burn 778a01.27p from the mame roms\nbapnp directory to a 27C160 eprom. Replace the program rom from your hornet cpu board by the burned eprom and power the syst…

  • Konami hornet revival

    neocps1 - - Project Showcase

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    Ok, here is the PowerPC code which should be injected starting at 0x2284 in the nba play by play code rom. Basically, since the hardware has direct memory access to the RTC, it programs the data from m48t58_data to the RTC and clears the rest of the nvram. Update m48t58_data for the game you want to reset the RTC for. Usually 27C160 are used for program roms, but you can use 27C322. So I suggest you to concat both original game program rom with the patched nba play by play code rom, add a switch…

  • Konami hornet revival

    neocps1 - - Project Showcase

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    Here is the mod I have done for gradius : 20180311.jpg

  • Konami hornet revival

    neocps1 - - Project Showcase

    Post

    As many knows, RTC on this system will lost its content when the battery runs out. You will be granted by a hardware security error. Not all programmers can program the M48T58Y chip, so often you are out of luck. I have made a program which still need some testing which allows reseting the RTC to the correct values when needed. So far it works for nba play by play and gradius 4. I will release all sources and tools when done. You can donate for this project to neocps1@gmail.com thank you !