ok kev got it right

at first i replaced all row 6 roms no change then row 5 like kev said and no more garbage

5f and 5e were bad replacing fixed the garbage

now game plays but i have orange ghost when you eat a power pellet and orange cherries all fruit is orange in corner

and the maze is more orange than pink

midway logo at beginning is blue

i tried to swap out 7f and 4a with one from a pac man board not a ms pack and it made it worse all colors were wrong is a 7f and 4 a different on a pac than a ms pac

what causes this ??? ghost and fruit colors

thanks kev

ton

On Fri, 18 Mar 2005 22:08:48 +0000, martin@guddler.co.uk wrote:
>ÊKev, this answers your question i think...
>
>ÊHonest, in certain circumstances it can (and does) work. It may
>Êhelp that i'm not so technically minded just yet so i look at it
>Êfrom a more logical point of view. I don't know all the ins and
>Êouts of why maybe it didn't ought to work, but from a simplistic
>Êpoint of view:
>
>ÊIf you stick a good chip on top of a good chip you should see no
>Êdifference, both chips will do exactly the same (unless maybe they
>Êare different speeds or something) and you should see no difference
>Êin the game. Granted, do it with the power on, and if it's program
>Êram you'll almost definately crash the program. Not sure about
>Êvideo ram. Bottom line you shouldn't really do it with the power on
>Ê- but surely everyone knows that anyway :)
>
>ÊIf you put a good chip on top of a bad chip then at the very least
>Êi'd expect to see a difference. Yes, if it's program ram it may not
>Êsuddenly make the program run since the outputs from the chip could
>Êaffect the good one. Seeing a difference warrants further
>Êinvestigation in that area, you can be lucky and find it solves it
>Êcompletely.
>
>ÊSo, in the case of the Frogger, i did admittedly have a bit of a
>Êhead start. Half the screen was full of rubbish, the other half
>Êfine so i knew it was a video fault of some sort. Powered off, put
>Êa good ram on top of one of the two 2114s in the video ram,
>Êswitched back on, perfect screen. Switch off, remove it, crap back
>Êagain.
>
>ÊBingo, fault found.
>
>ÊSomething i always do with things like galaxians and in this case
>Êfrogger simply because it's quick and easy to try befor digging
>Êeven a logic probe or meter out.
>
>ÊGoing back to the original post, i don't know if it will help or
>Ênot since i don't remember what the original problem was (and am
>Êrecompiling my OS so have no email history), my point was merely if
>Êit appears to be a graphics issue, give it a try it'll take no
>Êtime. Just be careful not to short anything out or other.
>
>ÊSomething that works for me and now i'll shut up since i've waffled
>Êon far too much already :) YMMV
>
>ÊRegards,
>ÊMartin.
>
>ÊJohn Robertson <jrr@flippers.com>Êwrote:
>
>>ÊI will have to try that sometime, can't hurt!
>>
>>ÊStill it might surprise me to see it works, but perhaps if it is
>>Êa bad (open) output on the RAM then your idea would certainly
>>Êwork even with static RAM like 2114's.
>>
>>ÊJohn :-#)#
>>
>>ÊAt 6:47 PM +0000 3/18/05, martin@guddler.co.uk wrote:
>>>ÊWell, it's certainly far from foolproof, but it takes no time
>>>Êat all to quickly do and if your problem is completely solved
>>>Êwhen piggybacking a
>>>
>>Êsingle
>>>ÊIC then it was worth it :)
>>>
>>>ÊI often find it helpful with logic chips too but that is
>>>Êdefinately not foolproof, the bad chip often still affecting
>>>Êthe inputs and outputs of the good chip. Again, it's quick and
>>>Êit sometimes get's me quick results
>>>
>Êthough.
>
>>>ÊMartin.
>>>
>>>ÊJohn Robertson <jrr@flippers.com>Êwrote:
>>>
>>>>ÊGenerally speaking that only works with Dynamic RAM that has
>>>>Êfloating outputs. I'm surprised it works with 2114s, however
>>>>Êit should work with the Video RAM on the Pacman/Ms Pacman
>>>>Êboards.
>>>>
>>>>ÊJohn :-#)#
>>>>
>>>>ÊAt 12:26 PM -0500 3/18/05, Electronicamuse@aol.com wrote:
>>>>
>>>>>ÊIn a message dated 3/18/2005 8:47:19 A.M. Eastern Standard
>>>>>ÊTime, martin@guddler.co.uk writes:
>>>>>
>>>>>ÊMore times than not i find piggybacking each of the 2114's
>>>>>Êin turn with a known good one will reveal which one(s) it is
>>>>>
>>>>>ÊDo other folks concur that this can be done? ÊI am not
>>>>>Êlooking for 100$ accuracy, but any fast tips can be of help.
>>>>>
>>>>>ÊThanks
>>>>>
>>>>>ÊDave
>>>>>
>>
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