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Yep power's up straight away. Thanks so much for the advice really appreciate it. Will try and track one down now.

Never thought of that Bob will check

Must be that chip assuming the power is OK to it of course.

Have ordered some 74ls14's hopefully that's the issue

yes just put it in the working machine and see if it boots up

Thanks guys, is the program card the board that sticks out of the main board and are they transferable between machines? The dodgy one is a "stop the clock" and the other one is a "flash cash". Thanks

I have had that very fault with a program card before, have you tried a card from another machine?

broken tracks by the battery as the battery leaks it kills the tracks by it

Club Cops n robbers With mine I have a red LED but no green 12v led lit Checked the power lead from PSU All fuses on PSU are ok Reel led on each reel lit Test switch when pressed does nothing Is there a usual cause with these boards not working? What usually goes when these boards stop working?

could be your program card is fauity

Hi all looking for any advice please. I have an old 80s barcrest machine that when you swith it on nothing happens except some buzzing through the speaker. I have put the power supply and mpu4 board into another machine and both work with no problems so now stuck for ideas. Any help would be very much appreciated. Thanks

I lifted pin12 out the socket but it reads the same! maybe this chip is bad too?

So I'm seeing the 100hz signal into IC18 pin 13 with the pattern you mentioned but pin 12 as in the scope pic above, so I pulled IC18 and replaced with a used chip which was in a socket, it passes the vector test on my programmer? Anyway the results are the same with this used chip fitted! I was convinced this was the culprit! Thanks Ronnie

Hi, You won't find much emulation here. This is mainly about real fruit machines from the 60's-80's The main site for emulation is www.desertislandfruits.com. Post an introductory post over there to get started.

Hey everyone! Im Huuj! Im new here, i dabbled at emulation in the past about 12 years ago or so!

Thanks so much Bob that gives me something to go at. Most of the stuff in the ram area has aleady been replaced and the ram was swapped out to rule that out. And for being a pro lol well I wish

It could be, on pin 13 there should be a double half wave 100Hz about 3-4v pp and then a nice chunky square wave out of 12. I've had various faults here IC18, R85 and broken track between the big diodes and R85. Could be anything really but easy to locate. If any of those components above look corroded I just change them all. The vbatt (not actually called that in MPU3) is the voltage to the RAM and battery charger. As long as you have 5v at the collector of T61 you should be OK. I usually change all the components around the battery area as most times they all show green legs. Saves a lot of time looking for faulty bits that you're probably going to have to change anyway. I reckon you'll be senior pro MPU3 fault finder before too long Ronnie.

Is it likely IC18 is bad? or something else prior on pin 13? Thanks Ronnie

Thanks Bob, ic18 pin 12 does not Look too clever assuming I have the scope set right? vbat is that the charging volts for battery? cheers Ronnie

Have you checked the 100Hz is OK? IC18 pin 12 should be a nice square wave. Other than that is the RAM good? Vbatt OK?

Jackpot Multiplier is a late 1970s, 2p play, electro mechanical conversion on what would have originally started as a Bell Fruit Ten Up electro The conversion build was by a company called ADMC or Automatic Development Manufacturing Company LTD who were based in Nottingham back in that era. The cabinet corner looks a bit battered but if it's complete inside and not been tampered with, then there is no reason why it should not restore and run again. Having said that, It looks like it's been stood for sometime and many of the timers could be jammed or seized so don't expect it run well if at all when plugged in. As it stands with the inner workings unseen so anything missing and it's spare parts so, About any offer up to £50.

Anything else I could look for whilst it's hooked up to a machine? stuck pia's etc? Thanks Ronnie

I've quit gambling a while back and sold / scrapped all my old machines but this looked like an interesting old thing that might be worth saving, even though I'm sure it'll be beyond me

I just solder bridged the key pins

old pc motherboards. ISA sockets is closest I can think of