Powerpack on AV and RGB modded Famicom/Nes

[Pit]

I recently got a nes powerpack to put in my RGB modded Nes.

Powering the Nes, the screen displays only white bars and glitched graphics and weird sounds. On my Pal Nes, the powerpack works fine.

Wondering why it doesn't work with my RGB Nes, I searched on the web and found other guys having the same problem with their powerpack and AV or RGB modded Nes front/top loader.

The solution seems to be replacing the Hitachi 74LS373 chip on the Nes motherboard, by :

- 74HC373 chip or 73HCT373 version.

- 74LS373 from other manufacturers (Texas Instruments, Motorola...).

When I receive the 74HC373 chip, I will let you know if my powerpack is ok with my RGB Nes.

[famifan]

Powering the Nes, the screen displays only white bars and glitched graphics and weird sounds. On my Pal Nes, the powerpack works fine.

what type of '373 chip are used in your Pal Nes?

[Pit]

Here is the 74LS373 chip in my pal Nes :



"SN74LS373N" from texas instruments.

[Pit]

Finally, my friend mpatard has replaced the 74HC373 on my NTSC RGB Nes. There was a 74LS373 chip in my NTSC Nes, like in the PAL one.

We had a bunch of 74LS, 74HC, 74HCT to test, and only the 74HC373 chips worked. With the LS and HCT, the powerpack didn't load properly  :





Here's the winner, near the PC10 PPU :



And the RGB Nes with powerpack in action :

http://www.youtube.com/watch?v=wYVPLZ62HnU&feature=youtu.be


THANX MPATARD :blowjob:

[famifan]

THANX MPATARD :blowjob:

such a weird smiley
do you really know its meaning? http://www.urbandictionary.com/define.php?term=blowjob

[Pit]

 

French people have strange humor you know 

[FAMICOM_87]

Finally, my friend mpatard has replaced the 74HC373 on my NTSC RGB Nes. There was a 74LS373 chip in my NTSC Nes, like in the PAL one.

We had a bunch of 74LS, 74HC, 74HCT to test, and only the 74HC373 chips worked. With the LS and HCT, the powerpack didn't load properly  :





Here's the winner, near the PC10 PPU :



And the RGB Nes with powerpack in action :

http://www.youtube.com/watch?v=wYVPLZ62HnU&feature=youtu.be


THANX MPATARD :blowjob:

Very informative thanks very match! I have the same problem with powerpack! on some consoles, so this is the solution!  I will try to replace those chips in my consoles (now I see PCB they are 74LS373 just like yours)

[Pit]

Oh good, hope this will help .

[FAMICOM_87]

http://bakutendo.blog87.fc2.com/blog-entry-165.html

they claim the same 

[famifan]

do you know if this kind of fix is backward compatible with regular famicom carts?

[FAMICOM_87]

Yes, because in some revisions there is 74HC737 versions of that IC, and in the other versions there is 74LS737

[famifan]

Yes, because in some revisions there is 74HC737 versions of that IC, and in the other versions there is 74LS737

glad to know that. So, the fix is almost harmless. Thanks