Unknown DIL40 C3B mapper

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krzysiobal
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Unknown DIL40 C3B mapper

Post by krzysiobal » Tue Oct 13, 2020 3:23 am

I spotted this when searching russian dendy forum: http://www.emu-land.net/forum/index.php ... msg1408015

At first I thought it is some ordinary MMC3 board, but the pinout does not follow any known version. What is more interesting is that both mask roms have address lines wired up to A18 and none of the official games is such big. So maybe this is multicart? But then, never seen multicart based on single mapper chip (except the JY Company blob). there always was

I am waiting for the response from author of this post, but meanwhile do you have any idea what game and mapper can it be?

Code: Select all

              .--\/--.              
        M2 -> |01  40| -- VCC       
   CPU A13 -> |02  39| -> PRG /CE   
   CPU A14 -> |03  38| -> PRG A17  ?
    CPU D7 -> |04  37| <- PPU /RD   
    CPU D6 -> |05  36| -> PRG A18  ?
    CPU D5 -> |06  35| -> PRG A13  ? 
    CPU D4 -> |07  34| -> PRG A14  ?
    CPU D3 -> |08  33| -> PRG A16  ?
    CPU D2 -> |09  32| -> PRG A15  ?
    CPU D1 -> |10  31| -> CHR /CE  ?
    CPU D0 -> |11  30| -> CHR A18  ?
  CPU /RMS -> |12  29| -> CHR A17  ?
?   CPU A0 -> |13  28| -> CHR A16   
   CPU R/W -> |14  27| -> CHR A15   
      /IRQ <- |15  26| -> CHR A12   
   CIR A10 <- |16  25| <- PPU A13  ?
   PPU A10 -> |17  24| -> CHR A14  ?
   PPU A11 -> |18  23| -> CHR A13   
   PPU A12 -> |19  22| -> CHR A11  ?
       GND -- |20  21| -> CHR A10   
              `------'              
                C3B       ? = not sure
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aquasnake
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Re: Unknown DIL40 C3B mapper

Post by aquasnake » Tue Oct 13, 2020 6:24 am

prg_a18 is connected to both prg-rom and chr-rom, it means that the prg_a18 is the common outer bank pin, and it has the (256+256)*n(n represents the common outer banks) memory structure.

mapper52 should fit in with this factor.

orginal mapper52:
prg_base[19:17] = cpu_data_in[2:0];
chr_base[19:17] = {cpu_data_in[2], cpu_data_in[5:4]};


just to leave prg_base[18] and chr_base[18] disconnected, and use prg_base[19] as prg_base[18]
Last edited by aquasnake on Tue Oct 13, 2020 8:34 am, edited 1 time in total.

krzysiobal
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Re: Unknown DIL40 C3B mapper

Post by krzysiobal » Tue Oct 13, 2020 7:21 am

aquasnake wrote:
Tue Oct 13, 2020 6:24 am
prg_a18 is connected to both prg-rom and chr-rom,
Do you have cartridge with that chip and can you confirm that? Can you check other unsure pins?

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aquasnake
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Re: Unknown DIL40 C3B mapper

Post by aquasnake » Thu Oct 15, 2020 6:33 pm

i dont know which mapper exactly this cart is, i have no this cart either.
based on the fanout pin of chr_a18, it needs 512KB chr-rom.
a Supertone/SuperGame/Kasheng's game probably.

nocash
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Re: Unknown DIL40 C3B mapper

Post by nocash » Thu Oct 15, 2020 9:05 pm

Is that a18 fanout thing something that is visible on the above photos???
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krzysiobal
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Re: Unknown DIL40 C3B mapper

Post by krzysiobal » Fri Oct 16, 2020 12:12 pm

nocash wrote:
Thu Oct 15, 2020 9:05 pm
Is that a18 fanout thing something that is visible on the above photos???
I don't quite know why is he claiming that CHR_A18 must be connected to PRG_A18. They might be controlled separately as well.

I found on the same site different cartridge using the same chip with additional К155КП2=SN74153N chip
They claim it contains:

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                                                PRG      CHR     MPR
Чип и Дейл = Chip & Dale                     | 128 kB | 128 kB | MMC1
Черепашки 2 = Teenage Mutant Ninja Turtles 2 | 256 kB | 256 kB | MMC3
Mighty Final Fight                           | 128 kB | 128 kB | MMC3
I wonder what this mux is muxing if there is no any external latch.
Attachments
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