Game:

Mega Man (1987)

Duration: 56:43

1,849 views

13

Actually this is the NES version, but with a strange graphical glitch :D
on PoverPack, recorded from actual console !
I made the title for a joke, because it is very similar to Atari 7800 graphics capabilities.
I made a footage from another games too (mario 1,2,3 Contra 1, exitebike, battle city 4 player hack)

https://youtu.be/_jDojks0CaY

I do not know if I can reproduce that glitch again, it happen to me only 2 times with different consoles ! If someone have a clue what tiger's that nice graphical glitch, let' us know!! :)
Some pictures taken of TV
http://www.famicomworld.com/forum/index.php?topic=9489.0

Sorry to disappoint you :)

To get 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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