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OutRun graphic fault

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muddymusic View Drop Down
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    Posted: 10 Aug 2018 at 11:21am
Any ideas what's causing this? pcb was working fine prior to this, then this fault appeared and has stayed. Voltage is good, running at 5.05v board side.


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Post Options Post Options   Thanks (1) Thanks(1)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 11:25am
This is a most likely problem with a sprite ROM, or accessing the sprite ROMs. 

How are the in-game sprites, they look ok from your screenshot? 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddymusic Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 11:38am
The crowd at the start of the game are corrupted, but in game everything is fine apart from the lady's hair.

Just realised I haven't actually done a rom test which should have been first on the list d'oh, I'll do that now!
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Post Options Post Options   Thanks (1) Thanks(1)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 11:40am
The ROM/RAM test doesn't check the sprite ROMs. 

It will verify the sprite RAM for you though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddymusic Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 11:58am
Yeah that's come back all good. Nothing is affected in game other than the guys in the car and the other bits in the photos. Which roms should I check?
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Post Options Post Options   Thanks (1) Thanks(1)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 12:10pm
Check the second bank of sprite ROMs:

mpr-10372 ic13 
mpr-10374 ic14 
mpr-10376 ic15 
mpr-10378 ic16

If they all checkout ok, then the problem could be in the circuit that addresses the ROMs itself. 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddymusic Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 12:13pm
Ok thanks, will do.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote muddymusic Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 3:59pm
Thanks for the advice - spot on, and all sorted now. Was maskrom 10376 at fault. Replaced and all good now.




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Post Options Post Options   Thanks (1) Thanks(1)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 4:02pm

Great stuff. If only all fixes were that easy!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote smarty Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 4:03pm
Awesome! Good job.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shinydaz Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 4:11pm
Nice simple fix and great advice
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Post Options Post Options   Thanks (0) Thanks(0)   Quote bonehead Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 4:14pm
I hope my pcb can be a simple fix like that!!!!
Just want to play it more than an hour before it breaks each time.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote karlcdoe Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 4:58pm
Originally posted by bonehead bonehead wrote:


Just want to play it more than an hour before it breaks each time.


Cut your crazy talk :-)

BTW thanks for those speakers, work a charm.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nurtuo Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 5:23pm
Good work Olly, and some excellent guidance from Dave.

How is the US side art printing coming on?


Edited by nurtuo - 10 Aug 2018 at 5:23pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 6:37pm
My name isn't Dave, but I'll answer to most things.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nurtuo Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 6:41pm
Originally posted by dj_yt dj_yt wrote:

My name isn't Dave, but I'll answer to most things.
 


LOL sorry Chris I was thinking of somebody else.

Great work anyway.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Outrun2 Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 6:45pm
Originally posted by dj_yt dj_yt wrote:

My name isn't Dave, but I'll answer to most things.

Rodney?

Nice to see it working again, this was the first fault I had on my first OutRun pcb all those years ago. No forums to help me then!
Would like:
No more cabs.. please!!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote nurtuo Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 6:51pm
Originally posted by Outrun2 Outrun2 wrote:

Originally posted by dj_yt dj_yt wrote:

My name isn't Dave, but I'll answer to most things.

Rodney?

Nice to see it working again, this was the first fault I had on my first OutRun pcb all those years ago. No forums to help me then!
 

Its OK Chris you can call me Trigger
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Post Options Post Options   Thanks (0) Thanks(0)   Quote dj_yt Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 7:16pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Flinnster Quote  Post ReplyReply Direct Link To This Post Posted: 10 Aug 2018 at 8:26pm
Epic save Chas! Big smile


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