how would Mega Man/Rock Man will looks on ATARI 7800 ?

Started by FAMICOM_87, May 29, 2013, 02:35:10 pm

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FAMICOM_87

May 29, 2013, 02:35:10 pm Last Edit: May 30, 2013, 06:35:22 pm by FAMICOM_87
Have you ever wonder how would Mega Man/Rock Man will looks on ATARI 7800  :question:
So here you are:  ;D

This is powerpack on famiclone (not NOAC) with my hand-made 72 to 60 pin converter .
in that moment it was not perfect contact may be.But I couldn't repeat the same situation  :crazy:













That Guy from Faxanadu

Seems like cool stuff! I don´t think I fully understand what you´ve created though. Is this a converter that makes Famicom games fit into an ATARI 7800 console?

FAMICOM_87

Quote from: That Guy from Faxanadu on May 29, 2013, 03:11:54 pm
Seems like cool stuff! I don´t think I fully understand what you´ve created though. Is this a converter that makes Famicom games fit into an ATARI 7800 console?


no no, it is just regular 72 to 60 pin convertor, this situation is just a glitch!  :D

That Guy from Faxanadu


FAMICOM_87

I come across to this glitch again, this time with original PAL NES console and captured a game-play via capture card  :)   :gamer:

https://www.youtube.com/watch?v=obuv6yAzSAw

MWK

I counter that with my Recca VCS glitch >> https://www.youtube.com/watch?v=Pr5Y3BIM_PA  8)

famifan

Quote from: MWK on June 21, 2016, 11:38:49 am
I counter that with my Recca VCS glitch >> https://www.youtube.com/watch?v=Pr5Y3BIM_PA  8)

dude, that was amazing! i wish i would be able to play the same way


FAMICOM_87

I made more footage from this glitch  :o
enjoy   ;D :D

https://youtu.be/_jDojks0CaY

Game list:

Super Mario 1
Super Mario 2
Super Mario 3
Contra 1
Exitebike 1
Battle City
Unchained Melody MENU


FAMICOM_87

 :D

So to trigger this glitch on Power Pack Just glue a piece of transparent tape here: (with help by krzy)
https://drive.google.com/open?id=1uWmMxpuXuzS3O606wXDIM9IX_Yzq06bg
for the regular cartridges you have to connect this pin to VCC or GND and isolate it like above from the slot
https://drive.google.com/open?id=1_5BsJ_LuJ3yKOSEYV0NsAQEx7FqLsvvk

More info about this glitch by krzy

All NES graphics (named pattern tables) are stored as 8x8 tiles as described here:
http://wiki.nesdev.com/w/index.php/PPU_pattern_tables

So taking letter X as an example (dot . represents bit 0)
Code:

$0xx0 = 1.....1.
$0xx1 = .1...1..
$0xx2 = ..1.1...
$0xx3 = ...1....
$0xx4 = ..1.1...
$0xx5 = .1...1..
$0xx6 = 1.....1.
$0xx7 = ........


When you short A0 on the ROM side to GND you make PPU fetch from both odd/even ROM graphic address cell return the same value (from even cell). So when PPU tries to fetch from addresses:
$0xx0, $0xx1, $0xx2, $0xx3, $0xx4, $0xx5, $0xx6, $0xx7
it will instead get values from those cells:
$0xx0, $0xx0, $0xx2, $0xx2, $0xx4, $0xx4, $0xx6, $0xx6

And thus the mentioned letter X will look like:
Code:

$0xx0 = 1.....1.
$0xx0 = 1.....1.
$0xx2 = ..1.1...
$0xx2 = ..1.1...
$0xx4 = ..1.1...
$0xx4 = ..1.1...
$0xx6 = 1.....1.
$0xx6 = 1.....1.

FAMICOM_87

Quote from: togemet2 on February 12, 2019, 02:55:54 am
This is really cool! I'm interested to see how Super Mario Bros 3 looks.  :o

check my video I posted it a few comments above  https://youtu.be/_jDojks0CaY

nensondubois

Maybe if I had a powerpak I would consider performing this modification but definitely not on original carts.

P

Yeah me neither. I wouldn't like to make a permanent mod to make a glitch occur on purpose.

FAMICOM_87

It haven't be permanent . I can be made with a switch :)  :gamer: :crazy: