Main Restorations Software Audio/Jukebox/MP3 Everything Else Buy/Sell/Trade
Project Announcements Monitor/Video GroovyMAME Merit/JVL Touchscreen Meet Up Retail Vendors
Driving & Racing Woodworking Software Support Forums Consoles Project Arcade Reviews
Automated Projects Artwork Frontend Support Forums Pinball Forum Discussion Old Boards
Raspberry Pi & Dev Board controls.dat Linux Miscellaneous Arcade Wiki Discussion Old Archives
Lightguns Arcade1Up --- Bug Reports --- Site News

Unread posts | New Replies | Recent posts | Rules | Chatroom | Wiki | File Repository | RSS | Submit news

  

Author Topic: Neo Geo  (Read 1690 times)

0 Members and 1 Guest are viewing this topic.

pbj

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #40 on: September 17, 2022, 09:37:27 pm »
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

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #41 on: September 18, 2022, 01:01:57 am »
Donít do this.  Just donít.  I cleaned it up a little after this was taken but donít do this.



Some pics of the weird glitches that only affect some gamesÖ





nitrogen_widget

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1672
  • Last login:Today at 08:42:11 pm
  • I want to build my own arcade controls!
Re: Neo Geo
« Reply #42 on: September 18, 2022, 11:34:50 am »
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

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 6943
  • Last login:Today at 02:20:38 pm
  • I break stuff...then fix it...sometimes
Re: Neo Geo
« Reply #43 on: September 18, 2022, 02:28:46 pm »
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

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #44 on: September 18, 2022, 02:45:31 pm »
On the motherboard or on the cartridge?  Itís hard for me to believe that Crossed Swords and Capcon vs SNK are utilizing motherboard chips that Samurai Shodown and Magical Drop 3 arenít. 

lilshawn

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 6943
  • Last login:Today at 02:20:38 pm
  • I break stuff...then fix it...sometimes
Re: Neo Geo
« Reply #45 on: September 18, 2022, 02:56:30 pm »
i'm thinking mainly the motherboard since its across multiple carts.

nitrogen_widget

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1672
  • Last login:Today at 08:42:11 pm
  • I want to build my own arcade controls!
Re: Neo Geo
« Reply #46 on: September 18, 2022, 05:33:40 pm »
On the motherboard or on the cartridge?  Itís hard for me to believe that Crossed Swords and Capcon vs SNK are utilizing motherboard chips that Samurai Shodown and Magical Drop 3 arenít.


thread where people have line issue with only some games.
https://www.neo-geo.com/forums/index.php?threads/aes-graphic-glitches-vertical-line-syndrome-now-w-pics.181876/




Malenko

  • KNEEL BEFORE ZODlenko!
  • Trade Count: (+58)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 13945
  • Last login:Today at 09:37:51 pm
  • Have you played with my GingerBalls?
    • forum.arcadecontrols.com/index.php/topic,142404.msg1475162.html
Re: Neo Geo
« Reply #47 on: September 18, 2022, 06:41:50 pm »
i'm thinking mainly the motherboard since its across multiple carts.

its across multiple games on 1 multi cart.  I think its more likely cheap components or bad ROMs on the bootleg cart.
If you're replying to a troll you are part of the problem.
I also need to follow this advice. Ignore or report, don't reply.

pbj

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #48 on: September 19, 2022, 11:59:06 am »
Yeah, it's various games on the multicart.  Some with the lines, some without.  Seems to be no rhyme or reason to it.  The behavior is consistent with the glitched games no matter what I do.  Anyway, I'll see what the seller wants to do about it, I guess. 

Pick and Mix works with the cartridge, which is a pleasant surprise.  It's actually remarkable how bad the documentation is for the Unibios.

Anyway, hold down select and boot up the system.  When you get to the title screen, let select go.  Press and hold it again to pull up the game list.  Pick your game and hit A.  If you want to change games, pull up the Unibios menu (Select + Start or Start + ABC) and select the soft reboot option.  Hold down select while it resets and you're back in business.  If you leave the game in attract mode, it will cycle through to different games automatically and play their attract modes.  Pretty cool, actually.

 :cheers:



pbj

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #49 on: September 19, 2022, 10:20:05 pm »
Yeah, so just hold down select for a few seconds and you get the pick and mix menu.  No need to do a soft reset.

 :cheers:

pbj

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #50 on: September 21, 2022, 11:34:44 pm »
Got some 3D printed parts from PL1 today.

Hereís the translucent reset button with a flashlight laying inside the case and pointed at it.  I really need to decide on an LED and just go with it.



And hereís the octagon gate installed.  I didnít test it before I put everything back together.  Oops.  Canít hit diagonals.  Iíll crack the stick open again and adjust the switch levers, but this definitely does not have the issues that chopper experienced.




A guy on discord that actually does a lot of repairs tells me my graphics issue is a bad connection from the bios chip to one of the downstream chips.  Iím skeptical but itís worth a shot.

 :cheers:


« Last Edit: September 21, 2022, 11:36:34 pm by pbj »

PL1

  • Global Moderator
  • Trade Count: (+1)
  • Full Member
  • *****
  • Offline Offline
  • Posts: 9019
  • Last login:Today at 11:00:18 pm
  • Designated spam hunter
Re: Neo Geo
« Reply #51 on: September 22, 2022, 04:01:08 am »
Hereís the translucent reset button with a flashlight laying inside the case and pointed at it.
Looks good.   :cheers:

And hereís the octagon gate installed.  I didnít test it before I put everything back together.  Oops.  Canít hit diagonals.  Iíll crack the stick open again and adjust the switch levers, but this definitely does not have the issues that chopper experienced.
Before you adjust the levers, try the flat blue plate with no microswitch nubs.

That's this model that Chopper linked to earlier with an extra 1.5mm travel for hitting a diagonal.
Chopper model print:
- 19.62mm point-to-point on octagon (1.5mm more from the center to the gate)
- 18.45mm flat-to-flat on octagon (1.475mm more from the center to the gate)
- 2.16mm thick plate (0.08mm thinner plate)

While you've got the stick cracked open, what is the diameter of the part of the actuator that engages the restrictor plate on your stick?


Scott
« Last Edit: September 22, 2022, 04:14:59 am by PL1 »

pbj

  • Trade Count: (+4)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 10465
  • Last login:Today at 03:40:45 pm
  • Obey.
    • The Chris Burke Band
Re: Neo Geo
« Reply #52 on: Yesterday at 12:32:56 pm »
This morning I buzzed out every connection on the bios chip to the downstream chips.  I did not find any breaks.

Opened up the 161 cart and didnít see any obvious problems.  Pushing on chips and stuff didnít change anything.

I think at this point Iím going to have to buy a legit copy of one of the glitchy games and see if the problem persists there. 

For now, I put it all back together and Iíll enjoy the ones that work.

Pinball led soldered in and pointing at PL1s translucent reset button.

 :cheers:



nitrogen_widget

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 1672
  • Last login:Today at 08:42:11 pm
  • I want to build my own arcade controls!
Re: Neo Geo
« Reply #53 on: Today at 08:13:22 pm »
for historical purposes.


Zebidee

  • Trade Count: (+9)
  • Full Member
  • ***
  • Online Online
  • Posts: 2742
  • Last login:Today at 11:38:00 pm
Re: Neo Geo
« Reply #54 on: Today at 09:46:33 pm »
lol, @nitrogen_widget, back in the era when games producers assumed only men (well, boys) could get into computer games.

There is an implied assumption that the gamer would be incapable of snaring a hot chick, so the ad tries to make them feel better about it by further implying that if they get a Neo-Geo they will then have a monster penis (with a face and drool!) that would require at least three hands to properly masturbate.

Geez   :dunno
Check out my completed projects!