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Author Topic: how would Mega Man/Rock Man will looks on ATARI 7800 ?  (Read 6121 times)
FAMICOM_87
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« on: May 29, 2013, 08:35:10 PM »

Have you ever wonder how would Mega Man/Rock Man will looks on ATARI 7800  Question-Mark Block
So here you are:  Grin

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












« Last Edit: May 31, 2013, 12:35:22 AM by FAMICOM_87 » Logged
That Guy from Faxanadu
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« Reply #1 on: May 29, 2013, 09:11:54 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?
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FAMICOM_87
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« Reply #2 on: May 29, 2013, 09:46:20 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!  Cheesy
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That Guy from Faxanadu
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« Reply #3 on: May 30, 2013, 07:43:16 PM »

Ha ha, then I get it! Nice glitch though  Smiley
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FAMICOM_87
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« Reply #4 on: June 20, 2016, 07:20:33 AM »

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

https://www.youtube.com/watch?v=obuv6yAzSAw
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MWK
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« Reply #5 on: June 21, 2016, 05:38:49 PM »

I counter that with my Recca VCS glitch >> https://www.youtube.com/watch?v=Pr5Y3BIM_PA  Cool
« Last Edit: June 21, 2016, 07:31:31 PM by MWK » Logged

famifan
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« Reply #6 on: June 22, 2016, 01:04:26 PM »

I counter that with my Recca VCS glitch >> https://www.youtube.com/watch?v=Pr5Y3BIM_PA  Cool
dude, that was amazing! i wish i would be able to play the same way
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FAMICOM_87
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« Reply #7 on: June 22, 2016, 09:11:52 PM »

there is more Smiley
https://www.youtube.com/watch?v=CbvqD159RVY

again megaman 2600 glitch  Grin
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FAMICOM_87
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« Reply #8 on: July 11, 2016, 10:32:56 PM »

I made more footage from this glitch  Shocked
enjoy   Grin Cheesy

https://youtu.be/_jDojks0CaY

Game list:

Super Mario 1
Super Mario 2
Super Mario 3
Contra 1
Exitebike 1
Battle City
Unchained Melody MENU
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AprkMk4
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« Reply #9 on: September 02, 2016, 03:39:10 PM »

Good.
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FAMICOM_87
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« Reply #10 on: February 10, 2019, 11:22:03 PM »

 Cheesy

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.
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togemet2
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« Reply #11 on: February 12, 2019, 08:55:54 AM »

This is really cool! I'm interested to see how Super Mario Bros 3 looks.  Shocked
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FAMICOM_87
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« Reply #12 on: February 12, 2019, 09:37:49 AM »

This is really cool! I'm interested to see how Super Mario Bros 3 looks.  Shocked
check my video I posted it a few comments above  https://youtu.be/_jDojks0CaY
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togemet2
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« Reply #13 on: February 15, 2019, 03:47:23 AM »

Haha. That's insane! I'll have to give this a shot myself sometime.

Good job on the find.  Shocked
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nensondubois
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« Reply #14 on: February 18, 2019, 03:27:44 AM »

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