Forever DUO 852 Games of NES (405+447)

Discuss hardware-related topics, such as development cartridges, CopyNES, PowerPak, EPROMs, or whatever.

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byemu
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Re: Forever DUO 852 Games of NES (405+447)

Post by byemu »

krzysiobal wrote: Sun Apr 05, 2020 2:31 am
NewRisingSun wrote: Fri Apr 03, 2020 11:52 am Does the menu actually reprogram the CPLD for each game mapper, or is it just programmed to run some kind of universal mapper, maybe even just enhanced MMC3, for which all games are modified?
It is programmed to emulate fixed universal mapper. It is not suitable for reprogramming after each game selection, because:
* According to datasheet, this chip can withstand up to 100 erase and reprogram cycles (which in my opinion is a little lowered, because the first flash-cartridge I built based on this chip was reprogrammed more that that and still works fine),
* That needs interfering the JTAG pins, which are here not tied to anything except the pin header
* During programming, this chip is not functioning (all its input/outputs) are in high impedance state, so there would be need of other "supervisory" chip (althought there is something called real-time ISP which can be wisely used to overcome this)

Here is dump of the $8000-$ffff of this ROM.
$8000-$ffff.nes

Menu code writes:

Code: Select all

CPU W A3 5700
CPU W 0C A000
CPU W 00 B000
CPU W 00 C000
CPU W 01 D000
CPU W 01 E000
CPU W 01 F000
...
JSR B000
when I made exact write sequence in Kazzo, reading $8000-$ffff still returned the same data, so there must be some quirk in it.
dink wrote: Sat Apr 04, 2020 8:41 pm 4 Nin Uchi Mahjong (first pic screenshot) is MMC5, so that board possibly emulates MMC5 - unless its a hack to a different mapper. (or miss-titled game)
Cartridge contains the NROM game.
Can not dump with kazzo, because it will auto reset.

After CPU W A3 5700,
mirror will change from 4L(init default) to V.
bank size will limit from 256K(init default) to 128K.

After CPU W 0C A000,
8K bank at 0x8000 will changed to bank 0x0C.
TheBoxGamePL
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Re: Forever DUO 852 Games of NES (405+447)

Post by TheBoxGamePL »

Will someone dump this cartridge using a floppy disk copier on Pegasus?
I'm looking for this dump but no one made it and apparently one made a dump but he said it was his dump and there is another rom that he doesn't have
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aquasnake
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Re: Forever DUO 852 Games of NES (405+447)

Post by aquasnake »

oops, this post has gone 4 ever, sorry 4 that
Last edited by aquasnake on Sat Jan 27, 2024 10:06 pm, edited 1 time in total.
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aquasnake
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Re: Forever DUO 852 Games of NES (405+447)

Post by aquasnake »

oops, this post has been removed to other topic, sorry 4 that
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