Author Topic: Trying to change to game with lower payout. (Read 5074 times)

Wildelyle · « **on:** December 15, 2016, 01:55:54 AM »

Im a newbie. I have a S2000 running an S+ game. . Im trying to change game from ss 4710 to 4714. Both are hot peppers. Keep getting eprom mismatch, then now ss eprom mismatch after finally trying a clear and keychip change. I used ivc 224 and key 45. Heres photo of what I have. Any help?

Shaggy · « **Reply #1 on:** December 15, 2016, 04:56:37 AM »

Are you sure the new chip is 120ns or faster? The S2000 needs a faster chip than the S+ machines. If the new chip is too slow, you won't be able to get it to work. I had to use a 120ns as a 150ns wouldn't work in mine. And of course there are always the Sb chips for the S2000s.

Dave

therockinelvis · « **Reply #2 on:** December 15, 2016, 04:23:58 PM »

Did the 4710 work before you tried the 4714? If yes I would suspect a bad SS4714. The SB001000 is right for using SS chips.

ianmcneil68 · « **Reply #3 on:** December 15, 2016, 04:40:25 PM »

The easiest way to go would be to go with SB. SB100055 for 3 coin. SB100056 for 2 coin. However, I probably have the answer to your question. I ran into the exact same issue with the same game. It turned out to be the chip. You have to peel back the tape on the chip that was working and read the number. In my case 27c64-12/p was the original working chip. I ordered a higher payout which came on a m27c64a. It did not work. When I ordered blanks of the 27c64-12/p and burned my backup copy of the higher payout it worked fine. If I recall correctly both chips were fast enough. It didn't make a lot of sense to me but I'm no expert on chips. I just know what worked. Hope that helps. SB is still the way to go. You can go over 98% payout.

Wildelyle · « **Reply #4 on:** December 24, 2016, 04:22:20 PM »

The 4710 worked before. . Havent tried ot again.

Wildelyle · « **Reply #5 on:** December 24, 2016, 04:37:22 PM »

Initially I tried just swapping the chips without a key or clear procedure. Did this cause the problem?

Shaggy · « **Reply #6 on:** December 24, 2016, 05:48:29 PM »

Not necessarily. When you boot it up and have the mismatch error. With the door open turn the reset key. If it shows another error keep turning the key after every one until it tells you to hold the test button in. When it says to close the door, do so and latch it and see if it continues to boot up.

Dave

Wildelyle · « **Reply #7 on:** December 24, 2016, 06:54:46 PM »

Without holding in test button? . Or? . If I hold test button 2 to 3 sec It keeps endless loop and same results ss eprom error. Time after time....

Wildelyle · « **Reply #8 on:** December 24, 2016, 08:06:49 PM »

Same error... Bad ss chip?

Shaggy · « **Reply #9 on:** December 24, 2016, 08:09:51 PM »

If you hold it in and it repeats, probably a bad chip. Sorry, but Merry Christmas

Wildelyle · « **Reply #10 on:** December 24, 2016, 08:12:36 PM »

I peeled back the label of chip in question and it reads.... See attackedment:

Compatable?

rickhunter · « **Reply #11 on:** December 24, 2016, 08:47:15 PM »

I agree with Shaggy. Eprom invalid is failing the checksum. Whatever is burned into that chip is not passing the checksum validation check.

Wildelyle · « **Reply #12 on:** December 26, 2016, 01:08:06 AM »

maybe bad chip. contacted the seller yesterday. asked him what his intentions where in shipping an uncorrupt compatable ss chip.

rokgpsman · « **Reply #13 on:** December 26, 2016, 08:30:17 AM »

The 2764A should work in all places that a 2764 does, the only difference is the burning (programming) voltage. But if the seller is going to replace it you can always ask that he use a 2764 this time, just to eliminate that as a possibility. Most likely something went wrong with the chip somewhere along the way, or it wasn't correctly programmed. The chip you peeled back the label on is a -10, which means a 100nsec chip, that is faster than a -120nsec, doesn't hurt anything to be faster. That speed rating is how long it takes the chip to make the stored data available when the mpu requests the data (access time), so a lower number means a faster chip.

It may not have been what happened, but this time of year with heating systems running in our houses and offices the air can get extra dry and that promotes very high static voltages. Handling of ic's need extra care not to get zapped, don't place them on static generators like fabric with fuzzy fibers. Ideally the ic has its legs protected by being inserted into conductive foam or even sitting on alum foil. Careless handling with your hands after you've walked across carpet can damage the chip. Best to not touch the ic legs, hold the chip by its main body without touching the legs. We used to see lots of unexplained ic failures this time of year until we got everyone in the parts room trained about how to handle delicate electronic ic's. A lot of people think it is bunk because they do it all the time and no problems occur. But all the ic manufacturers have done studies showing static elec damage is real - that's why they always store and ship ic's in containers or foam with a conductive film.

http://www.electroschematics.com/4313/static-electricity-and-precautions/

A 2764 eprom has 65,536 storage locations internally, it just takes 1 of those to get zapped or corrupted and your checksum will fail.

Wildelyle · « **Reply #14 on:** December 26, 2016, 05:03:47 PM »

Flashing NO DISP.

ianmcneil68 · « **Reply #15 on:** December 26, 2016, 05:18:08 PM »

If you would like, I can ship you a working chip with the highest possible payout. If it works for you, we'll work out a price. If it doesn't solve your problem then just ship it back. I still think installing the proper SB would be the easiest solution. Let me know. I think that I have both options, SS and SB.

ianmcneil68 · « **Reply #16 on:** December 26, 2016, 05:34:27 PM »

By the way, I was having the same exact issue. An endless loop of the same error when I installed a higher payout chip (which I ordered online). When I burned my backup to the new chip, which matched the numbers of the original, it worked. Now, whether or not I was burning it with the proper voltage as rokgpsman was saying, I have no idea. I am a novice at best when it comes to chips. I just know that when I used the same chip as the original, all worked well. My hot peppers is up and running with a similar setup as you have except I am using SS4703 which is the highest payout.

rokgpsman · « **Reply #17 on:** December 26, 2016, 07:50:58 PM »

On your eprom burner (programmer) when you select the chip part number, like 2764 or 27c64A or whatever, the programmer will automatically select the correct burning voltage and other parameters specific to that eprom. And most programmers will read the eprom id to double-check that you selected the correct eprom part number. What I meant earlier was that the 2764 and 2764A eproms should substitute for one another in the circuit, they perform the same, only difference is in how they are burned.

I think your idea of sending him a chip that you know works ok is a good idea.

rokgpsman · « **Reply #18 on:** December 26, 2016, 08:00:05 PM »

You are likely aware of this, but just to make sure,,,,,,,

The socket where you plug in the 4710 chip is larger than the 4710 chip is (has 2 extra contacts on each side, done for possible future upgrade), so the chip has to be plugged into the lower part of the socket as shown in your photo. Be sure you are installing the replacement chip the same way.

Wildelyle · « **Reply #19 on:** December 27, 2016, 02:32:23 AM »

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Author Topic: Trying to change to game with lower payout. (Read 5074 times)