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kcase01
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« on: November 15, 2015, 09:53:18 pm » |
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I have a Pacman Plus and once in a while Pacman has a blue block around him. It goes a away for a little while then comes back. Has anybody seen this before and knows what to look at to fix this?
Thanks,
Kevin.
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iankellogg
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« Reply #1 on: November 16, 2015, 08:35:41 am » |
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initial guess would be bad eprom or bad connection with eprom. Maybe the sockets are dirty for 5e 5f
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kcase01
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« Reply #2 on: November 17, 2015, 01:23:48 pm » |
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Just replaced 5e and 5f with no change, but haven't had a chance to check the sockets. I will have to do this this weekend.
Kevin.
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SuperGunGuru
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« Reply #3 on: November 17, 2015, 09:04:23 pm » |
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This one's getting close man I can't wait to see it running.  |
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kcase01
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« Reply #4 on: November 23, 2015, 04:14:59 pm » |
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I put contact cleaner on the sockets and then let it dry. Tried the game with the same results. The blue block is only around pacman and nothing else on the screen.
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kcase01
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« Reply #5 on: December 01, 2015, 03:13:40 pm » |
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Anymore ideas about this issue?
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iankellogg
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« Reply #6 on: December 06, 2015, 12:06:01 am » |
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i'm honestly not sure. The eprom feeds the output buffer memory almost directly and all the sprites share that same pathway. the only thing left I can think of is the color prom is bad. Maybe the palette is bad that pacman uses and nothing else.
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kcase01
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« Reply #7 on: December 11, 2015, 05:17:43 pm » |
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Ian thanks for responding. I will have to look at the color proms next.
I soldered a cap kit for this board and still getting the same blue box around Pacman. I also tried it in a known good cab with proper voltage, this did not help. Anybody else have any ideas?
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HarrieD
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« Reply #8 on: December 14, 2015, 02:45:29 pm » |
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This issue is caused by the sprite roms. Put them in an eprom reader and verify them with the ones from mame. I guess that fixes your problem.
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My blog / pinball collectionRestoration projects: Fire!, Outrun Good friends: Funhouse, Whirlwind, Earthshaker, BTTF, Seeburg V200, Neo Geo cab Left the building: F14 Tomcat, Independence Day
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kcase01
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« Reply #9 on: January 03, 2016, 11:17:38 am » |
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Reflow solder to 5e and 5f sockets. Already tested and programmed new 5e and 5f. This did not help. Color prom 7f and 4a I reflowed solder to these sockets. I had already replaced one of these sockets. Just need to check color prom programming.
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kcase01
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« Reply #10 on: January 25, 2016, 08:53:03 pm » |
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How does one read the color proms? I have a Xeltek SuperPro III programmer, but don't know what device to choice to read these. If his programmer can read them. Please help me!
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iankellogg
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« Reply #11 on: January 25, 2016, 08:57:26 pm » |
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that programmer is unable to do bipolar proms.
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kcase01
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« Reply #12 on: January 26, 2016, 11:08:02 am » |
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What programmer do you have that will do Bipolar proms?
Thanks
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iankellogg
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« Reply #13 on: January 26, 2016, 11:15:01 am » |
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some of the really old ones can do it like the data IO or datamann. I think there are a few others but I don't know too much about every programmer there is.
I think the TOPMAX II can do some bipolars as well.
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kcase01
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« Reply #14 on: January 26, 2016, 01:53:53 pm » |
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Do you know what the chip numbers are for the two bipolar for Pac man 7F and 4A?
Thanks
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