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 Try the site in https mode Site News

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

  

Author Topic: Donkey kong jr sprite issue help please!!  (Read 1914 times)

0 Members and 1 Guest are viewing this topic.

GMZombie

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 379
  • Last login:March 22, 2022, 10:11:23 am
  • I am a living Legend who fixes stuff... mostly
Donkey kong jr sprite issue help please!!
« on: November 05, 2020, 03:50:44 pm »
This board has been an issue  for a while. Ive been replacing chips due to them being rusty. Ill supply pics. Anyways im having an issue with the sprites not being there just blocks moving. See pics. I have replaced so many chips im st a loss pf what to do next. Changed sockets reflashed 2732 chips the right way following someone elses advice and everything. This board was a dead board and im almost done with it. Everything but this ia fixed. I have checked and roms work in a dk3 boardset with dkjr cpu board perfectly. Please help me. I have a logic probe and a logic analyzer to use. Gotta fix pics too big. 

lilshawn

  • Trade Count: (+3)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 7513
  • Last login:July 04, 2025, 12:24:07 pm
  • I break stuff...then fix it...sometimes
Re: Donkey kong jr sprite issue help please!!
« Reply #1 on: November 06, 2020, 05:00:01 pm »
ram issue? hard to say really. typically if there are sprite issues it's rom or ram...and you've verified the roms are good in another board.

ram or maybe ram/rom addressing issue. like an 74LS08, 74LS86 or a 74LS163 chip gone bad or something.

GMZombie

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 379
  • Last login:March 22, 2022, 10:11:23 am
  • I am a living Legend who fixes stuff... mostly
Re: Donkey kong jr sprite issue help please!!
« Reply #2 on: November 11, 2020, 10:58:21 am »
The weird thing is ive replaced all 74ls163 74ls08 and all but 2 ls86 chips and the 2 i didnt are by the 3n and 3p chips. My tester says they are good. Ive replaced all the chips besides the 2 ecl ram on the 8 7 and 6 rows except for a random ls109 chip and a few ls157 chips. I had alot of rusty chips. Tried swapping the 28 pin mb43419 chip and that didnt change anything.  Here are some pics.

jennifer

  • Trade Count: (0)
  • Full Member
  • ***
  • Offline Offline
  • Posts: 2895
  • Last login:August 11, 2023, 06:24:58 am
Re: Donkey kong jr sprite issue help please!!
« Reply #3 on: November 11, 2020, 11:14:07 am »
I would have to agree with L/Shawn on most likely a ROM/RAM issue, That probe probibally won't be of much help since you are getting a signal and not dealing with corruption, I would be curious about your logic analyzer on that point...I am working on a Fluke 9010a platform that in conjunction with an analyzer would give more flexibility and speed although a horribly expensive project...Eldorado games does nice work in my experience, although they may not touch it now that its been worked on, but might be worth a call.