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Neo Geo
pbj:
First - we must all solemnly swear that we will never piggy back a chip onto an old chip ever again. Just don't do it. Don't. Stay patient and wait for your socket. That old bios chip will desolder cleanly with patience. It's not worth that many hours of your life reflowing, reflowing, reflowing and then realizing you don't have the cartridge fully seated and that's why you're still getting a white screen.
By the way - with Unibios and no cartridge you now get a white instead of blue screen! Would have been nice if they mentioned that somewhere....
Anyway, Unibios installed and working. Hooray.
Don't piggy back chips.
So, I'm having this weird issue with my 161 in 1 cartridge. Some of the games work perfectly. Some of them have weird vertical lines through the image. These weird vertical lines even extend to the Unibios boot screen and Neo Geo boot screen. The games play fine but have weird lines. There seems to be no rhyme or reason to it. Samurai Shodown 1 & 2 - lines. Shodown 3 & 5 - no lines. Crossed Swords - lines. Puzzle Bobble - no lines. I read through every post on the Neo-Geo tech support forum with the word "vertical" in it. Only things I see have the same effect on every game and not just selective like this. My cartridge connector is gleaming clean... but I did drive all over the damn place trying to find electronics cleaner. Third store was the charm.
:banghead:
pbj:
Don’t do this. Just don’t. I cleaned it up a little after this was taken but don’t do this.
Some pics of the weird glitches that only affect some games…
nitrogen_widget:
I searched Neo Geo lines on screen and AES lines on screen.
I don't know how different the hardware is but it appears general consensus is rom chip issue.
usually a bad trace.
sometimes under a chip unfortunately.
lilshawn:
perhaps a bad solder joint on one of the flatpack chips.
looks like a single pin or trace issue. maybe video pallet ram or something?
https://wiki.neogeodev.org/index.php?title=Palette_RAM
i'm not sure how the sprites are laid out (if its a first bit error or somewhere else in the other 7 bits mid-stream.) IE i can't tell if its the edge of a sprite or the middle since they are all tiled. and i don't know how big they are.
try pressing down on one of the flatpacks and booting it and see if it goes away when pressing on any of them. maybe a pin has just lifted up...it's common in gameboy advance games
https://wiki.neogeodev.org/index.php?title=Category:Chips
see if one of these looks like it might cause a single bit error written to ram and causing the output you see
pbj:
On the motherboard or on the cartridge? It’s hard for me to believe that Crossed Swords and Capcon vs SNK are utilizing motherboard chips that Samurai Shodown and Magical Drop 3 aren’t.
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