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PostPosted: Thu Jan 18, 2018 11:56 am 
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Joined: Sun Jun 12, 2011 12:06 pm
Posts: 446
Location: Poland
I got some interesting carts recently so I thought of sharing them, as the design is quite rare & interesting.

1. Don Doko Don 3
Image Image Image Image Image

Game:
Don Doko Don 3 (Dok Doko Don 2 hack)

My comments:
* It is mapper 33 with mirroring register moved from $8000.6 to $e000.6
* Quite elegant hardware solution - everything stored in 74*670, while combinatorial logic is provided by PAL. Also, one bit of mirroring which should be packed somewhere is stored in PAL.
Code:
---------------------------------PAL-------------------------------------------
Automatic analysis:
 !REG2GR! <= (!PPU-A12);
CIRAM-A10 <= (CPU-D6 & PPU-A11) | (!CPU-D6 & PPU-A10);
       O2 <= (I12);    //unused input
       O3 <= Probably non-combinatorial
 !REG2GW! <= (!CPU-A13) | (CPU-!ROMSEL!) | (CPU-R/!W!) | (CPU-A14);
 !REG1GW! <= (!CPU-A1) | (CPU-!ROMSEL!) | (CPU-R/!W!) | (CPU-A14) | (CPU-A13);
 !REG0GW! <= (CPU-!ROMSEL!) | (CPU-R/!W!) | (CPU-A1) | (CPU-A14) | (CPU-A13);
 PRG-!CE! <= (!CPU-R/!W!) | (CPU-!ROMSEL!);
Additional manual analysis for feedback looped outputs:
       O3 <= CPU-D6 when CPU-!ROMSEL!=0 and CPU-R/!W=0 and CPu-A13=1 and CPU-A14=1 and CPU-A1=0 and CPU-A0=0
CIRAM-A10 <= PPU-A10 when O3='0' else PPU-A11
---------------------------------MEMORY MAP------------------------------------
PRG-ROM: 128 kB
CHR-ROM: 256 kB
Bus conflicts: no

CPU:
$8000|$a000|$c000|$e000
-----+-----+-----+-----
$8000|$8001|    -1     

PPU:
$0000|$0400|$0800|$0c00|$1000|$1400|$1800|$1c00
-----+-----+-----+-----+-----+-----+-----+-----
  $8002    |  $8003    |$a000|$a001|$a002|$a003

---------------------------------REGISTERS-------------------------------------
[....pppp] $8000/$8001 [mask: $e003]
     ||||
    ++++- 8 kB PRG at $8000-$9fff/$a000-$bfff

[.ccccccc] $8002/$8003 [mask: $e003]
  |||||||
  +++++++- 2 kB CHR at $0000-$07ff/$0800-$0fff (lowest bit is NOT ignored)
 
[cccccccc] $a000/$a001/$a002/$a003 [mask: $e003]
 ||||||||
 ++++++++- 1 kB CHR at $1000-$13ff/$1400-$17ff/$1800-$1bff/$1c00-$1fff

[.m......] $e000 [mask: $e003]
  |
  +------- mirroring (0=V, 1=H)
-------------------------------------------------------------------------------



2. Dragon Ball Z 2
Image Image Image Image Image Image

Game: Dragon Ball Z 2 (ported from Bandai 24C02)
One of the very few games that uses VRC2+DIP8 EPROM. AX5705 is VRC2 (this chip can also be seen under name 23C269 which also has functional EPROM lines)
Due to different time of changing ROMSEL/M2, they added circuit for delaying rising edge of M2.

PAL has 3 latches so research is in progress.

3. Don Doko Don
Image Image Image Image Image Image

Game:
Don Doko Don (ported from mapper 33 to VRC2)

Mapper:
VRC2
PRG-ROM: 128 kB
CHR-ROM: 256 kB

My comments:
There is additional 2 kB ROM mapped at $6000-$7fff (only A0-A9 wired). It is some kind of patch,
that game jumps and executes code from here (probably modified routine to switch bank,
which cannot be modified in original rom due to insufficient free space)


4. Dragon Ball Z 3
Image Image Image Image Image Image

Same situation like with Dragon Ball Z2, but the way they enhances VRC2 this time to be quite different. Also, some of PRG/CHR lines are reversed. They also ommited the M2 delaying circuit (but this PCB I saw previously on this forum which HAS this circuit)

PAL has latches so research is in progress.


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PostPosted: Thu Jan 18, 2018 12:03 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 7800
Location: Seattle
krzysiobal wrote:
* It is mapper 33 with mirroring register moved from $8000.6 to $e000.6
It's worth pointing out that it's Taito that did that.

Mapper 33 has the mirroring control register at $8000.6, and one board (DDD1) supports but doesn't use IRQs
Mapper 48 has the mirroring control register at $E000.6, and several boards use the TC0190 (without IRQs) and a PAL to move the mirroring control register to $E000.6


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PostPosted: Thu Jan 18, 2018 3:05 pm 
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Joined: Mon Dec 12, 2011 8:15 pm
Posts: 429
Dragon Ball Z 2
Dragon Ball Z 3
I DUMPED,BUT eeprom.not emu.

Don Doko Don 3 is mapper 222.not IRQ
Dragon Ninija is mapper 222, have IRQ


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PostPosted: Thu Jan 18, 2018 3:23 pm 
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Joined: Sun Apr 13, 2008 11:12 am
Posts: 7800
Location: Seattle
The board that Krzysiobal reverse engineered that held DDD"3" is exactly mapper 48, not mapper 222.


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