It is currently Mon Sep 24, 2018 6:24 pm

All times are UTC - 7 hours



Forum rules


1. NO BLATANT PIRACY. This includes reproducing homebrew less than 10 years old, with the exception of free software.
2. No advertising your reproductions, with the exception of free software.
3. Be nice. See RFC 1855 if you aren't sure what this means.



Post new topic Reply to topic  [ 13 posts ] 
Author Message
PostPosted: Fri Mar 09, 2018 11:01 am 
Offline

Joined: Fri Jul 04, 2014 2:34 pm
Posts: 335
Location: Germany
So, I once had a bootleg of the said game and noticed it was just a MMC3 board with an addtiional 74'161.
After checking the traces I came to this result:

Code:
                  74'161
                  __  __
             VCC |01\/16| VCC
        WRAM /CE |02  15| NC
          PRG D4 |03  14| PRG A15
          PRG D5 |04  13| PRG A16
          PRG D6 |05  12| PRG A17
          PRG D7 |06  11| PRG A18
             GND |07  10| GND
             GND |08  09| WRAM /WE
                  ------


So I got myself a TKROM board (MMC3 + PRG RAM + Battery) just to be sure.

I wired things up like I thought it would be with the bootleg but the game's not booting.
Connecting it like normal MMC3 I can dump the game fine and everything is equal when comparing both files (except iNES header, of course).

I tried wiring PRG A15-A18 ONLY to the '161 as well as MMC3 as well. Neither worked.

What am I missing or even doing wrong? Thanks in advance!


Top
 Profile  
 
PostPosted: Fri Mar 09, 2018 11:23 am 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7552
Location: Seattle
Ice Man wrote:
I tried wiring PRG A15-A18 ONLY to the '161 as well as MMC3 as well. Neither worked.
Well, that's definitely a major requirement, too, although evidently insufficient. (Only one output should be connected to any given wire, unless there's a way to make only one drive the wire at any given time)

My understanding is that mapper 189 actually comprises several major variations:
1- Several don't enable the MMC3 WRAM register before expecting to be able to select the 32K PRG bank. (Master Fighter 2 does appear to write $80 to $A001, however)
2- Several write to the $4020-$5FFF region instead of $6000-$7FFF region. (Master Fighter 2 does appear to write to $6132, however)
3- Several specify the bank in the lower nybble instead of the upper nybble. (Master Fighter 2 does appear to use the upper nybble, however)
4- Several use N108 clones instead of MMC3 clones

Interestingly, Mesen's and Nintendulator's implementations of mapper 189 causes Master Fighter 2 to crash, but Nestopia's doesn't. And there's nothing obviously different between their implementations... And NintendulatorDX says that it's not relying on uninitialized memory either...


Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 4:46 am 
Offline

Joined: Fri Jul 04, 2014 2:34 pm
Posts: 335
Location: Germany
I wish I still had the game board to check everything again. If anyone actually has a Master Figthter II or similar game of mapper 189, please post pictures of the PCB or even a rev-en if done. I'd highly appreciate it!

I don't think I've actually checked all the traces going/coming from the AX5202P so I'm most likely missing something. I just can't figure out what yet.

What's wondering me is that Thunder Warrior actually uses a PT8154 instead of a AX5202P as well as 74'138 and 74'175 + resistors, etc.

Does that mean theres 2 types of mapper 189? Or was my board that I had just a mapper hack of some kind?


Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 7:48 am 
Offline

Joined: Tue Feb 14, 2017 9:50 am
Posts: 91
I've seen at least two different PCBs for the YOKO shell of Master/Street Fighter II, none of them had a AX5202P. The most common has 2 COBs. The other had no COB but two chips marked PT8154 and PT8159 (which I'm guessing is the first print). There's supposedly a third one that has only one COB + a gate. Can't make out the part number from the blurry pic tho.

It'd be interesting to know how was your cartridge? I've definitely seen pirated release using an AX5202P.


Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 8:53 am 
Offline

Joined: Thu May 19, 2005 11:30 am
Posts: 655
lidnariq wrote:
Several write to the $4020-$5FFF region instead of $6000-$7FFF region. (Master Fighter 2 does appear to write to $6132, however)
The original version of the game, according to Hummer Cheng, is the one with the Street Fighter II title screen, and that one writes to $4132, FWIW. I would not be surprised to find that the ROM images that write to the $6xxx range are actually multicart extracts.


Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 9:11 am 
Offline

Joined: Fri Jul 04, 2014 2:34 pm
Posts: 335
Location: Germany
I sold all my bootlegs long time ago. I wish I still had it but I remember the cart shell looked like this:
https://vignette.wikia.nocookie.net/bootleggames/images/9/9d/MF2.jpg

I just hope I'm not mistaking it with Street Fighter II. Though both use Mapper 189.

The cart design was similar to what I drew (yay for Paint skills).


Attachments:
pcb.png
pcb.png [ 4.14 KiB | Viewed 1874 times ]
Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 9:21 am 
Offline

Joined: Tue Feb 14, 2017 9:50 am
Posts: 91
I might have the board you're describing, but mine has a defective PCB and no case. I'll check tonight.

Attached the original release. Plus what I assume to be the same board you're describing but with COBs.
These are not my photos.


Attachments:
12594003_702391163231658_3138132008139517160_o.jpg
12594003_702391163231658_3138132008139517160_o.jpg [ 68.84 KiB | Viewed 1866 times ]
886338_886339274814277_8579263992898996795_o.jpg
886338_886339274814277_8579263992898996795_o.jpg [ 258.34 KiB | Viewed 1866 times ]
Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 9:23 am 
Offline

Joined: Fri Jul 04, 2014 2:34 pm
Posts: 335
Location: Germany
If only the first picture wasn't so blurry.
What IC is that on the top left? If that's a 74'161 we're getting close.

It's definetely not the one with the PT8154 and PT8159 chips.


Top
 Profile  
 
PostPosted: Sun Mar 11, 2018 1:29 pm 
Offline

Joined: Tue Feb 14, 2017 9:50 am
Posts: 91
Here are my two non-Yoko Master Fighter II cartridges:
PCBs shots

On mine it's a 74'74


Top
 Profile  
 
PostPosted: Mon Mar 12, 2018 2:42 am 
Offline

Joined: Fri Jul 04, 2014 2:34 pm
Posts: 335
Location: Germany
Thanks alot. That AX5202P really does look close/similar to mine from what I can remember.
I wouldn't be surprised if they had different PCBs for the same game at all.


Top
 Profile  
 
PostPosted: Mon Mar 12, 2018 4:27 am 
Offline

Joined: Mon Apr 24, 2017 10:23 pm
Posts: 5
Pictures of mine Master Fighter III (just title screen hack)


Attachments:
20170305_184227_01.jpg
20170305_184227_01.jpg [ 3.02 MiB | Viewed 1749 times ]
20170305_184125_01_01.jpg
20170305_184125_01_01.jpg [ 2.13 MiB | Viewed 1749 times ]
Top
 Profile  
 
PostPosted: Mon Mar 12, 2018 2:31 pm 
Offline

Joined: Sun Jun 12, 2011 12:06 pm
Posts: 377
Location: Poland
What's with the Street Fighter? Two MMC3 connected in paralel?


Top
 Profile  
 
PostPosted: Sat May 05, 2018 11:06 pm 
Offline

Joined: Sun Apr 13, 2008 11:12 am
Posts: 7552
Location: Seattle
I just noticed that the picture relayed by MLX above shows a PT8154 in a DIP40, but NEScartDB's picture of Gluk the Thunder Warrior shows a PT8154 in a DIP28...??


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 13 posts ] 

All times are UTC - 7 hours


Who is online

Users browsing this forum: No registered users and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB® Forum Software © phpBB Group