Mission: Impossible --> Rescue an rare 42in1 ROM
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Mission: Impossible --> Rescue an rare 42in1 ROM
Hellow at everybody,
I'm new at these communities that it's amazing!!
The history:
When I was a child, my first console (An NES clone with 42in1 games build-in) died. Latter I had an original NES, but I don't forget about these games than now I can't play again. So I tried to open it and see how it works. Finally, I broke it totally but I keep some ICs because I know that some of these have the ROM.
Latter I bought a game that I don't like to install the ROM here, but it doesn't run... (No internet days, no info, no knowledge about mappers, etc..., only an innocent boy )
26 years later, I found these ICs and the ROM! So... I want to finish the purpose that I had "few" years ago.
What we have:
I have restored the pins from the poor room, and I read successfully it and dumped it in a Bin file.
After some research at the net, I have found a similar model of clone with another ROM inside. It isn't exactly the same but it is very near.
What I need?:
Basically... I need to know the next steps that I must do.
My dream is to be possible to convert it on a playable ROM to share at the community and recreate a cartridge to play it again on my NES hardware.
I tried to find it online but the uploaded version of 42in1 ROM is not exactly the same as mine, but very very near.
Could you guide me, please?
I'm new at these communities that it's amazing!!
The history:
When I was a child, my first console (An NES clone with 42in1 games build-in) died. Latter I had an original NES, but I don't forget about these games than now I can't play again. So I tried to open it and see how it works. Finally, I broke it totally but I keep some ICs because I know that some of these have the ROM.
Latter I bought a game that I don't like to install the ROM here, but it doesn't run... (No internet days, no info, no knowledge about mappers, etc..., only an innocent boy )
26 years later, I found these ICs and the ROM! So... I want to finish the purpose that I had "few" years ago.
What we have:
I have restored the pins from the poor room, and I read successfully it and dumped it in a Bin file.
After some research at the net, I have found a similar model of clone with another ROM inside. It isn't exactly the same but it is very near.
What I need?:
Basically... I need to know the next steps that I must do.
My dream is to be possible to convert it on a playable ROM to share at the community and recreate a cartridge to play it again on my NES hardware.
I tried to find it online but the uploaded version of 42in1 ROM is not exactly the same as mine, but very very near.
Could you guide me, please?
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Running DY-N4201_42in1 as mapper 226, I get a 20-in-1 menu, not a 42-in-1 one. I am not sure where the data for the additional 22 games is supposed to come from, as we would need another 512 KiB of data for that.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Thanks for your help!NewRisingSun wrote: ↑Thu Jan 09, 2020 2:47 am Running DY-N4201_42in1 as mapper 226, I get a 20-in-1 menu, not a 42-in-1 one. I am not sure where the data for the additional 22 games is supposed to come from, as we would need another 512 KiB of data for that.
Maybe I have lost another ROM chip that contains them. I will try to find it.
- krzysiobal
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
http://forums.nesdev.com/viewtopic.php?f=9&t=19027
Pressing select switches between two ROMs, hmm.
Pressing select switches between two ROMs, hmm.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Nice project! It was the same machine, but I think your machine is a little newer than mine. My IC is dated about '91 and yours at '92, just for curiosity.krzysiobal wrote: ↑Thu Jan 09, 2020 3:59 am http://forums.nesdev.com/viewtopic.php?f=9&t=19027
Pressing select switches between two ROMs, hmm.
Thanks a lot for your info. Now I can see the light
I was wrong when I had selected the 27c040 type of EPROM to read my ROM. Now, I have selected the 27c080 and I have the full ROM data.
I used the map 226 as NewRisingSun proposed and runs fine. But I can't simulate the "reset" ROM remap with my emulator (OpenEmu), so I can execute only the first 20-in-1 games.
Besides run the binary on an emulator, I want to rebuild the ROM on a cartridge to run on the original hardware. I was looking for something like it:
https://www.muramasaentertainment.com/i ... nents.html
Maybe I will need to study the krzysiobal schematic to mod the PCB to recreate the map or Reset function.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
You still did not dump it correctly; the second 512 KiB half is identical to the first. Once you have correctly dumped both halves, the correct mapper for the reset-based variant will be 233. 226 is for a non-reset-based variant of various sizes up to 2 MiB. I did not understand earlier that the switch was via Reset, so I gave the wrong mapper number.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
I tried to download the data from ROM again but every time I get the same result.
I think that my IC is 512KiB and not 1MB. So I can assume that I have lost the second IC that contains the 22-in-1 games.
If I’m not wrong, on krzysiobal post explains that the 22-in-1 are the same that the cartridge version. So I’m thinking to take out the lost data from these ROM and complete mine.
I think that my IC is 512KiB and not 1MB. So I can assume that I have lost the second IC that contains the 22-in-1 games.
If I’m not wrong, on krzysiobal post explains that the 22-in-1 are the same that the cartridge version. So I’m thinking to take out the lost data from these ROM and complete mine.
Re: Mission: Impossible --> Rescue an rare 42in1 ROM
In your specific ROM, what else is written on it?
In the picture you've found, it says "DY-N4204 538000P-D874 9218EAIJAPAN", but so far the only text you've relayed is "DY-N4201" on yours.
In the picture you've found, it says "DY-N4204 538000P-D874 9218EAIJAPAN", but so far the only text you've relayed is "DY-N4201" on yours.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
you shall latch $8000.7 and $8001.0 before the loader execuing soft reseting procedure( PC jump to $FFFC).
in another word, the mapper should always spy $8000.7 and $8001.0, once the two bits are not equal to zero, it changes the high 2 bits of outer address immediately, and never be allowed to change once more, enen if $8000.7 and $8001.0 would be flushed after reset
in another word, the mapper should always spy $8000.7 and $8001.0, once the two bits are not equal to zero, it changes the high 2 bits of outer address immediately, and never be allowed to change once more, enen if $8000.7 and $8001.0 would be flushed after reset
Last edited by aquasnake on Fri Jan 10, 2020 4:12 am, edited 1 time in total.
Re: Mission: Impossible --> Rescue an rare 42in1 ROM
and if your dumped size is always 512KB(2 same 512K halves), i think the mapper has locked the high address bits, unless you writes the right dumping script or removes the flash/mask rom then read by a programmer
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Thanks for your info!!
The IC is desoldered and directly fitted to an EEPROM/EPROM/ROM Reader/Writer, so It might read the entire contents without problems. I assume if I obtain the same 512KiB twice is because the selected target IC has a double capacity than mine.
- krzysiobal
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Take a multimeter and check if PIN1 of this mask-rom shows any voltage drop with reference to other pins, when in diode test mode.
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Re: Mission: Impossible --> Rescue an rare 42in1 ROM
Show screenshots and/or a gamelist of the 22-in-1 part. If it is the same as the DY-636-42's, then one might just take that one's 1 MiB ROM and replace the 20-in-1 part with yours.