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  • Where's Mr. Du! gone!!!

    Ah crap, I've got a Mr. Du! (yes Du, not Do or Doh) and he's vanished from the game, along with a few other characters

    If you can make out the snap (yes the screen needs degassing I think) you can see only one baddy, but Mr Du is there somewhere along with another baddy. The apples above the cherries aren't there either.



    I remember reading of this happening in other games but can't remember where or what the fault was.

    Any Ideas??

    Foot
    Last edited by Foot; 7th September 2006, 07:14 PM.
    "Beer, it does a belly good!"

    Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

  • #2
    Yep. Degauss that sucker....wont bring ya sprites back, though.
    ...maybe, but then again "maybe" covers a lot of things, like: maybe Michael Jackson really is LaToya in drag, or maybe if Dorothy clicks her heels 3 times and says "There's no place like home" while she is at home, she would telefrag herself..." - MadMikeAU

    | My | |

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    • #3
      First thing, try re-seating your EPROMS.

      Regards,

      JWG

      Comment


      • #4
        [QUOTE=JWG]First thing, try re-seating your EPROMS.

        Is this the technical term for pulling them out cleaning them and putting em back in?

        Now where did I put that deguassing wand... That's right I don't have one yet AGHHHHHH!!!

        Foot
        "Beer, it does a belly good!"

        Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

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        • #5
          Yes that right, sorry about that :-)

          JWG

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          • #6
            LMAO
            The Pinny Parlour likes this post.

            The Pinny Parlour Welcomes you to Aussie Arcade.

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            • #7
              Originally posted by JWG
              First thing, try re-seating your EPROMS.
              I cleaned and re-seated everything and nothings changed. Would the fault indicate that one of them is shagged or something completely different?

              Foot
              "Beer, it does a belly good!"

              Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

              Comment


              • #8
                Originally posted by Foot
                I cleaned and re-seated everything and nothings changed. Would the fault indicate that one of them is shagged or something completely different?

                Foot
                Either or both.

                It could be a sprite RAM issue...or the writes arent getting to the RAM...or the RAM info isnt getting to the color prom...or the color prom is shagged...or...
                ...maybe, but then again "maybe" covers a lot of things, like: maybe Michael Jackson really is LaToya in drag, or maybe if Dorothy clicks her heels 3 times and says "There's no place like home" while she is at home, she would telefrag herself..." - MadMikeAU

                | My | |

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                • #9
                  Ok, I've run the self check on the game and it comes up clean. What maybe a possible cause for missing sprites is the following J306X chips look pretty ordinary and they seem to have something to do with sprite generation.



                  Numbers on the chip are J306X TBP 185030N. There is a bit of corrosion on the pins and one appears to be soldered.

                  Two other similar ones are in the same condition. These appear to have something to do with contrast/ brightness of the display?



                  Very blurry, numbers are MB 7051 6251 C44

                  Are replacements available for these chips? and if so where could I track them down?

                  Foot
                  Last edited by Foot; 7th September 2006, 07:14 PM.
                  "Beer, it does a belly good!"

                  Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

                  Comment


                  • #10
                    OK.

                    T2 and U2 are both 74S288 (off the schematic) these are indeed equal to the MB7051. These are the color proms.

                    E10 is also a 74S288. It looks to be doing something with color (possibly for the character set aka playfield). Looking at your pic, the leftmost solder on RA3 looks dodgy. Judging by the thicker trace leading to it, I'd say that pin is 'common' and a bad solder there would cause the whole array to not work.
                    ...maybe, but then again "maybe" covers a lot of things, like: maybe Michael Jackson really is LaToya in drag, or maybe if Dorothy clicks her heels 3 times and says "There's no place like home" while she is at home, she would telefrag herself..." - MadMikeAU

                    | My | |

                    Comment


                    • #11
                      I'll check that RA3 connection tonight.

                      I'm still trying to find a supplier for the other chips to replace them.(ideas?)

                      And, Should any chips anywhere one the board run warm/ hot? if so, what's and acceptable temp range, if not what's a likely cause?

                      Foot
                      "Beer, it does a belly good!"

                      Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

                      Comment


                      • #12
                        The chips that you are referring to are all proms and yes they normally run hotter than other IC's. They are prone to carbon build up and corrosion, you should remove them from their sockets and clean the legs. But be very careful because the legs will be weak, I normally use either a scotchbrite pad or fine sandpaper to clean them. Make sure if you remove them that you put them back into the same socket that you removed them from as they have code programmed into them and won't work in other positions or on other games.

                        If you need a replacement try http://www.mikesarcade.com/cgi-bin/s...category=PROMs
                        WANTED

                        Another Holiday
                        .

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                        • #13
                          I rechecked all the soldering on the board and touched up a couple of areas. Didn't change anything.

                          Re the PROMs: I'm not too keen on removing these suckers as I can see that they may have already had broken legs previously and they have been resoldered. Hence the search for replacements. I have emailed mikes arcade and am waiting a response.

                          On the degaussing issue... Last night I was tiding the wiring up in the cab and thought things would be much tidier if the monitor was rotated 180. This would also allow me to alter the colour pots if needed (they were facing the back of the cab)

                          So I rotated it and replugged the monitor to alter the orientation and what do you know!! Colours are now all mickey duck!!!

                          Just goes to show you never can tell what will fix these issues

                          Foot
                          "Beer, it does a belly good!"

                          Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

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                          • #14
                            Below is the reply I got from Mikes Arcade:

                            Hello,

                            We can do it if you have the code dumps of those chips. I don't have them on hand. You'd need to order:

                            4 PROM82S123 chips with programming. Then send us the images named as you'd like them labeled.

                            Best,

                            - Mike -


                            Ok, my question (even if it's silly) is where would I get the code dumps from?

                            Foot
                            "Beer, it does a belly good!"

                            Wanted: Pacman Cab Next Project: Skinny MAME Cab for Samfoot, thread soon, no really. I might even do one on my Pole Position cab!

                            Comment


                            • #15
                              could you get them from a mame rom ????
                              The best action is wrist action!!!!!!

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