Leaderboard

Haven't posted here for a while although plenty of boards have gone through the workshop, no time as per usual. Anyway one today had me head scratching for a few minutes. The board came in with 'no boot' as the fault which is usually most of the transistors, resistors and track around the battery area. In this case someone had been here before and had done quite a few repairs. On first inspection I noted the volume pot was missing and on boot up there was nothing although the RESET was good and there was activity on the ADDRESS lines. The DATA lines however were very low, under 2v. First suspect was the CPU which was innocent. Fitting the volume control just gave a continuous farting noise? So where does one go from here? The DATA lines go to all the support chips, RAM, CTC and the Synth chip!! A bit of luck intervened here before I started socketing everything. Checking the waveform of what there was on the DATA bus by the SIO chip showed about 2v p to p. Travelling back towards the CPU I noted it got slightly less per each chip ending up at the Synth chip where it was the lowest. Probably only talking about 0.2v per chip but that made it about 1v difference. Now the synth chip looked like it had been removed and replaced but probably not swapped and it hadn't been socketed (grrrr!) Anyway, once removed, socket fitted and replaced it then booted first time and ran as it should. The chip in question is the AY-3-8910 and these are now becoming difficult to source at a reasonable price. prieces on Ebay seem to vary between approx £18-40 which is ridiculous. I don't even look at the Chinese rubbish as the phrases fingers and burnt spring to mind! Even the Yamaha equivalent YM2149 is getting scarce although I have ordered a couple.

PCP - RunnaRoundTech: System 1Fancy going for a run, then give this 2p game a run for it's money.Keyboard shortcuts in the notes.Thanks to:Wizard (RIP) for MFMEThe rom provider@innfection for the image used@AK45 for testing.Play using MFME V20.1 only RunnaRound.zip

Great machine I remember when I was at MAM Inn Play we had to do an update on all of ours out on site with a new disc as someone had all of the answers on a sheet of paper doing the rounds in the pubs !

Cheers love great stuff, was playing it last night.

REDTCS17S.BIN Hi See if this is any good....

awesome thank you

leisure lites (will sort you out) google it ronnie remember 60v bulbs so you need 4 to make 240v , if not depending how its wired the whole channel wont light or you may blow the remainder of the bulbs on that channel if you stick 240v to a line with only 60v on it.. https://leisurelites.co.uk last time i brought some i think he charged me 15 quid for 100 . collected . i made my rainbow light 240v leds though lol ... but the cave lights are still 60v bulbs .. like the ones you need stay safe

Another on the Facebook marketplace. Great game It it's original condition and looks complete inside, still on old money but the main glass has just about had it. Although electro machines are steadily increasing in price, Whether this one will get the £350 asking price could be too high. https://www.facebook.com/marketplace/item/370202454763222/

I'm on it. Sounds like a decent bloke, on the phone. He's going to ring me back. Curiously, I already have a machine called Zig Zag, but it's a conversion of a Bradley Challenger from pre-war days. That's for when I have my 'other' hat on!

I have to explain first of all what brought me back to this forum. During a long lunchtime exercise walk around the ex WWII aircraft hangers in Llandow, my colleague picked something up from the grass verge... would you believe it!

On and done... Seem to work ok. Happy days Thanks for the support and encouragement and replies Thanks to all those that helped. You know who you are