Ms. Pac-man the hotstepper!

incrediblegamez

Well-known member
Joined
May 30, 2007
Messages
5,189
Reaction score
36
Location
Grove City, Ohio
I have a Doyle's 96 in 1 that has ran great until a few nights ago when in the middle of a game my ms pac/ghost became misaligned with the maze and their movements became jerky.

Took a video of it tonight


All other games are doing this as well. Glitching out with jerkiness/studdering. I have looked everywhere for a diagnosis with no luck. I have done the basic, pulling out the kit, making sure everything nice/clean/secure but no fix.

Thanks in advance!
 
If I recall one of the 7489 ram will cause this. Also check the 74283 below it.

pardon my ignorance, but how exactly do you test these with a meter? I haven't brushed up on my Randy Fromm videos in awhile as you can tell. ;)

I forget which pins you meter on an IC.
 
Incrediblegamez - did you ever fix this problem? I've got a board with Doyle's kit installed that is doing the exact same thing. The game will work fine at first but after it's been on for 15 minutes, the character movement horizontally is all jerky but vertically it's fine.

Lawnmowerman's website says it could be the 74LS283 @ 1F. I'm wondering if indeed that was the problem for you.
 
Incrediblegamez - did you ever fix this problem? I've got a board with Doyle's kit installed that is doing the exact same thing. The game will work fine at first but after it's been on for 15 minutes, the character movement horizontally is all jerky but vertically it's fine.

Lawnmowerman's website says it could be the 74LS283 @ 1F. I'm wondering if indeed that was the problem for you.

It was a board issue. I was given another and it worked just fine
 
I fixed one like that... it was a bad 7489.

You can use either a 7489 or a 74189 to replace the bad one.
 
This problem I see more and more lately. Its almost always one of the 7489 rams. There are a total of 7 chips in that area that are likely suspects but I always check those 7489 first. The good thing about these are you can usually piggyback a new chip on them for a quick test.
 
Looks like I spoke too soon. I had the game running all day yesterday and it was working great and then towards the end of the night it started doing it again. Powered it on this morning and it's doing it right away so it's not heat related. I've checked continuity on all the legs of 3H to their respective traces and everything looks good. I even tried swapping in new 7984's in both 3H and 3F and still no change.

I wouldn't think a bad 2114 RAM would cause this problem, would it?

Any other ideas what could be causing this?
 
Looks like I spoke too soon. I had the game running all day yesterday and it was working great and then towards the end of the night it started doing it again. Powered it on this morning and it's doing it right away so it's not heat related. I've checked continuity on all the legs of 3H to their respective traces and everything looks good. I even tried swapping in new 7984's in both 3H and 3F and still no change.

I wouldn't think a bad 2114 RAM would cause this problem, would it?

Any other ideas what could be causing this?


2114 will not cause this. Were the 7489 socketed on your board? If so then someone has replaced them before. Possible they pulled a trace on them.
If you give up and need the board repaired PM me.
 
2114 will not cause this. Were the 7489 socketed on your board? If so then someone has replaced them before. Possible they pulled a trace on them.
If you give up and need the board repaired PM me.

I didn't think the 2114 RAM would cause this but thought I would ask.

The 7489's at 3H & 3F were not socketed. I removed them carefully and put sockets on both. At first I removed and socketed 3F and that didn't fix it. Then I removed and socketed 3H and it was working great for around 6-7 hours and then it started up again and now it does it as soon as I turn on the game. I've checked continuity on each leg of 3H to the respective pins/traces of other chips and everything looks good. I had to look at the schematics to determine alot of that as it's not very easy to figure out by looking at the board.

Is it normal for 3H & 3F to get really warm after only being on for a few minutes? A few other chips on the board get really warm as well. I've checked the voltage at 3H and it's showing 4.98v so that looks good.

Thanks for the repair offer. If I don't make any progress on this I'll have to take you up on that.
 
Back
Top Bottom