Bosconian ram error. What ram?

cwales

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I bought a Bosconian and it was working great. I think my problem is I tend to have these games on more than the average person, being they are in my store and it looks really crappy to have some of them off when people walk in where it's really cool to have them all on when you walk in.

I am not complaining at all about this by the way, I got a great deal on this and a qbert and I'm VERY happy with the whole experience.I expect problems mostly because of my horrid luck (you've seen my luck with things, right Jeff?)

The seller says he only had it on for a bit at a time and I had it on for hours and was getting a "RAM 4L" error. Sometimes it says "QAM 4K" but I assume that's an error of some kind because if I turn it on and off it goes back to "RAM 4L".

When it first did it yesterday, after being on maybe 3 hours, many of the chips felt real hot so I left it off an hour and the game played fine again. After about an hour it got the error again and I just left it off for the night.

Today when I came in I turned it on and it got the error right away, tried it a few times and it's always one of those two error messages. Can anything be causing this besides bad ram? I guess I should just order ram and try it.

Which beings me to my real question, what kind of ram does Bosconian use and where can I get it from? :)

I thought it might be the same as Galaga but they only have 16 legs where Galaga's have 18? (http://www.arcadechips.com/product_info.php?products_id=37)

Thanks.
 
Look on the board and see what the chips say. Im guessing its going to have 2147 or 2148 and possibly 2125 and some 2114. Keep in mind there are a bunch of subs for 2125 so your board could have an alternate part on it.
Wish i could help more but I have never looked at a bosconian board. A quick look at some schematics I found online show 2147/2148 and HM2511(2125). On the 2147 & 2148 it will have one or the other. If its using 2147 there will be more of them compared to the 2148.
Once you figure out what you need PM me and I can hook you up with the rams.
 
I bought a Bosconian and it was working great. I think my problem is I tend to have these games on more than the average person, being they are in my store and it looks really crappy to have some of them off when people walk in where it's really cool to have them all on when you walk in.

I am not complaining at all about this by the way, I got a great deal on this and a qbert and I'm VERY happy with the whole experience.I expect problems mostly because of my horrid luck (you've seen my luck with things, right Jeff?)

The seller says he only had it on for a bit at a time and I had it on for hours and was getting a "RAM 4L" error. Sometimes it says "QAM 4K" but I assume that's an error of some kind because if I turn it on and off it goes back to "RAM 4L".

When it first did it yesterday, after being on maybe 3 hours, many of the chips felt real hot so I left it off an hour and the game played fine again. After about an hour it got the error again and I just left it off for the night.

Today when I came in I turned it on and it got the error right away, tried it a few times and it's always one of those two error messages. Can anything be causing this besides bad ram? I guess I should just order ram and try it.

Which beings me to my real question, what kind of ram does Bosconian use and where can I get it from? :)

I thought it might be the same as Galaga but they only have 16 legs where Galaga's have 18? (http://www.arcadechips.com/product_info.php?products_id=37)

Thanks.


According to the Manual, RAM Error 4L is a bad RAM at 1E on the video board.

The schematics aren't very clear, but it looks like a 2018P-2 (2Kx8)
 
The seller says he only had it on for a bit at a time and I had it on for hours and was getting a "RAM 4L" error. Sometimes it says "QAM 4K" but I assume that's an error of some kind because if I turn it on and off it goes back to "RAM 4L".

RTFM. It's either a 2114 or 6116/2016/2018.. bit 0 is going bad, hence the change from R to Q and L to K. 4L is bank 4, low nybble, not a physical location on the board. The manual will tell you what location 4L refers to.
 
ok.. below that is "M58725P" There are two chips with the same number, one at 1E and one at 1H, I tried swapping them hoping the error number would change but it didn't :/

You should be looking on the VIDEO board and not the CPU board. There should be a chip at 1E that is a 2018. It could have a different part number, but look for that one first.
 
Thanks for the help to everyone who chimed in, I'll post and tell if this solves my issues or not when the ram gets here...
 
ok.. below that is "M58725P" There are two chips with the same number, one at 1E and one at 1H, I tried swapping them hoping the error number would change but it didn't :/

58725 = 6116 = 2016... standard 2kx8 RAM.

Could be the socket too... Midway sockets suck.
 
So.. I got ram today, that did not fix the problem. So I guess I have to try replacing the socket? Anything else I should look at before that?
 
New ram did not fix the problem. Same error :/ The power supply is a little flaky, if I adjust the +5 to 5.00 the +12 is 12.63. That seems close enough though, right? I guess I have to pick up a couple sockets and try replacing them.
 
@!#?@!

Replacing sockets did not help. I did find some weird traces that were fixed before, one of them was really loose and I fixed that, but that's on the CPU board and it also didn't change anything. Where are these bus transceivers I should look at?
 
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