John's Arcade Forum - Classic Arcade and Pinball Collecting and Restoring Discussion Forum - RETRO MAME - Nintendo Vs Forum

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.

initial guess would be bad eprom or bad connection with eprom. Maybe the sockets are dirty for 5e 5f

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.

This one's getting close man I can't wait to see it running.  8)

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.

Anymore ideas about this issue?

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.

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?




 

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.

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.

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!

that programmer is unable to do bipolar proms.

What programmer do you have that will do Bipolar proms?

Thanks

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.

Do you know what the chip numbers are for the two bipolar for Pac man 7F and 4A?

Thanks

4A
82s129
IM5623
HM7052
HM7114

7F
HM7603
82s123
MI5331M

Ian,

 I just tried to read both 7F and 4A with my programmer (Xeltek SuperPro III) it did read them. The manual does say it supports Bipolar Proms. I am just not sure on how to program them. How to I get the proms. Do you sell them? If so sell me a 82s123. I need to program 7F Pac Man Plus. It looks like my programmer will write them. It has voltage of 12v and 24V. Please let me know if you do sell them.

Thanks Kevin

I don't have any for sale, they are a super pain to get. Best place i know of right now to get them is https://www.twistywristarcade.com/

I can't find your programmer anywhere online to look up the manual or else I would have helped you on that.

Thanks for the he help and for suggesting twisty wrist. I found the info about my programmer tonight at www.Xeltek.com

Thanks again.