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PostPosted: Fri Nov 22, 2013 1:50 pm 
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A DDP cart that used MMC5? I thought DDP was written for MMC3. I'd still like to see a discrete version of MMC3 :D


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PostPosted: Fri Nov 22, 2013 2:05 pm 
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He probably meant MMC3. MMC5 would require a dual ported 1kb SRAM chip and literally hundreds to thousand of such TTL chips to work.


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PostPosted: Fri Nov 22, 2013 3:14 pm 
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DDP was for FDS. A pirate DDP would probably implement a subset of FDS functionality, in much the same way that pirates of the other Super Mario Bros. 2 (J) did.


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PostPosted: Fri Nov 22, 2013 3:16 pm 
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That and there is a (current day) rom hack of DDP to MMC5 IIRC. So perhaps that's adding to the confusion.

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PostPosted: Fri Nov 22, 2013 6:33 pm 
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Bregalad wrote:
MMC5 would require a dual ported 1kb SRAM chip and literally hundreds to thousands of such TTL chips to work.
Total number of bits of state of the MMC5, other than that RAM: about 240 bits. Half of that is just for CHR banking. And a sufficiently fast SRAM—probably even as slow as 70ns—can be used as a dual-ported RAM in the NES given a little support logic.

I'd bet it's closer to 50 74xx ICs, especially if we're allowed to use obsolete parts like the 74'558 (8x8 multiplier), 74'219 (16x4 RAM), and 74'670 (4x4 RAM).

That many 74xx ICs is still far too many to power off the NES's power supply, or fit in a cartridge.


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PostPosted: Fri Nov 22, 2013 9:57 pm 
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lidnariq wrote:
Btw, I asked BootGod to test: the MMC2 does behave according to both the patent and the discretes implementation here. By which I mean, fetches from the left pattern table only trigger on the first row.

The question is, is the same true of the MMC4?

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PostPosted: Fri Nov 22, 2013 11:20 pm 
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nintendo2600 wrote:
Yep, I'll get some done up and post them later. It's from a Doki Doki Panic pirate cart.


Doki Doki Panic on MMC5!
Does it really need that much?!

Quote:
File: Doki Doki Panic (FDS Conversion).nes
CRC: 8B692CBF
SHA-1: 64D3AB894788A9670EF4B3E3F05A45ECEF4ACC45
System: NES-NTSC
Board: BTL 2708, Mapper 103
PRG-ROM: 128k
V-RAM: 8k
W-RAM: 16k
Solder Pad: H:1 V:0
Battery: No


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PostPosted: Sat Nov 23, 2013 1:25 am 
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Quietust wrote:
The question is, is the same true of the MMC4?
Can't be. MMC4 doesn't connect to PPU A0..A2.


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PostPosted: Sat Nov 23, 2013 10:49 am 
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FARID wrote:
nintendo2600 wrote:
Yep, I'll get some done up and post them later. It's from a Doki Doki Panic pirate cart.


Doki Doki Panic on MMC5!
Does it really need that much?!

Quote:
File: Doki Doki Panic (FDS Conversion).nes
CRC: 8B692CBF
SHA-1: 64D3AB894788A9670EF4B3E3F05A45ECEF4ACC45
System: NES-NTSC
Board: BTL 2708, Mapper 103
PRG-ROM: 128k
V-RAM: 8k
W-RAM: 16k
Solder Pad: H:1 V:0
Battery: No


The reason MMC5 was used is because only MMC5 offers 32KB of PRG-RAM that can be mapped from $6000 to $DFFF. No other standard mapper does this.


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PostPosted: Sun Nov 24, 2013 6:16 pm 
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infiniteneslives wrote:
That and there is a (current day) rom hack of DDP to MMC5 IIRC. So perhaps that's adding to the confusion.


correct. my bad. :oops:


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PostPosted: Sun Nov 24, 2013 7:27 pm 
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Still would like to see a discretes implementation of MMC3, if it is that.
Or honestly, I'd like to see it even if it's just an FDS-emulating RAM cartridge.


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PostPosted: Mon Nov 24, 2014 12:41 am 
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Been asked to reupload the pictures of the first post
So here it is
Have fun and keep up the good work! :beer:


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PostPosted: Mon Aug 03, 2015 1:24 am 
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FARID wrote:
Been asked to reupload the pictures of the first post
So here it is
Have fun and keep up the good work! :beer:


Much appreciated. Thanks!


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PostPosted: Mon Aug 03, 2015 10:33 am 
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FARID wrote:
Been asked to reupload the pictures of the first post
So here it is
Have fun and keep up the good work! :beer:


FARID, can you upload this to a different file host? I can't manage to download anything from 4shared without it asking me for social media logins or bundled adware fake setup.exe crap, etc.

mediafire and sendspace have less issues with bundled adware, as does mega.co.nz, and dropbox has very little either.

LN

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PostPosted: Mon Aug 03, 2015 12:01 pm 
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I used bugmenot to get around the creepy creepy 4shared BS the most recent time I had to.

That said, I still have the images, as well as my traced image, so I could put them somewhere but would like Farid's OK first.


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