Leaderboard

I've got an MPS1 board at home Rich which I'm pretty sure works. You're welcome to it if it helps.

Down to the final two in this present batch and of course I always leave the worst till last!! This one wouldn't boot and I couldn't see why not? There was activty on all the DATA and ADDRESS buses but nothing happened. Someone had had a good go this already and 4 of the PIO chips had been socketed and swapped out. In the head scratching that followed I socketed the other two so that I could test all the chips in a good board. So all PIO's and SIO tested OK. The CTC was then swapped but still the same. The RAM was already socketed but a replacement also made no difference. Attention then turned to the Synth chip but that proved to be innocent as was the CPU. Next stop the Thames I was thinking....... but one last thing was to check all the pull up resistors to the buses which should all measure 10K Ohms. As I was checking I noticed two of the DATA lines only measured 5K!! Blow me there was a short between D1 and D6!! As I've mentioned before trying to trace the PCB tracks on these boards is horrendous and if you have a short it could be anywhere. With the panic hat now removed and logic hat back on I thought it had to be caused by the previous repairer and that indeed was the case. The only place I could see where the two DATA lines were anywhere near each other was under the RAM socket so a quick removal was in order. Once I'd seen this I was cock-a-hoop as I new I'd sussed it. Can you see it? Once cleaned up and the socket re-fitted and chip put back in I was thinking it'll be time to wrap up. Shriek, it still doesn't do anything! The short had definitely gone but not a dickie bird. Quickly slipped in the test RAM chip again and BINGO she lives!! Phew. This is why repairers always hate it when a board has already been worked on as any faults unknowingly applied can be real pigs to find. OK so now I have a functioning board I can actually do some testing. First thing that became apparent was some of the 7 segment displays were showing extra segments. I've seen this quite a lot recently and it mostly due to the 100 Ohm standoff dropper resistors (bottom left hand corner) which get bashed about due to poor storage. They then break their solder joints and touch each other.

On the note of the actual thread….. if anyone’s interested now. Pic chips for certain machines are available off this company at a cost of £25 plus vat and delivery. I emailed regarding one for £25 Addams Family ROMs and they have the one needed a BC025. if anyone needs one give them a try. Chris Street emailed me back in no time with a yes we can and price. They also supply ROMs if you don’t have anyone kind enough to flash them for you, thanks to the Mecca I am lucky with those :-) good luck all.

No worries mate, there if you want it.

Ah well, there's an hour of my life I'm not getting back! Thanks for clearing that up, next up is Eastenders....

MFME MAME Frontend - FruitBAR allows you to build your own virtual arcade, the community theme store can be found here -> https://fruitbar.uk I was on another forum where someone pointed me towards this site, I am the developer of FruitBar my frontend program for MFME and a few other systems, I have not built my cabinet just yet but I think I have all the bits ready to build it. Time is the bigger issue.... I started developing FruitBar for my own cabinet but people just seem to want to use it...... I will build my cab some day...

Here's another rom that runs directly into Labyrinth. At least this time is 25p/£10 cash. SecretCastlev0.1.zip

And the wipers were designed to go in one direction,so really very bad conversions

So really they are making the machine do something it should not do.not good really.i have noticed though on early stepper motor machines they had two motors together for nudge up.im surprised that hot dog and pussy cat didn't nudge up,they were really jam packed with relays and timers.

It's like reversing a tramcar without swinging the pole. You can do it for short distances, carefully. For a while...

ron,if it nudges up i would have thought it would bent the wipers on the reels.

Ah it’s tony amot’s I thought you’d got a machine for a minute.

oh wow thanks for the offer, but i couldnt accept it, keep it for a rainy day matey . tony amot is local to me and going to help me with the situation but so many thanks gain for offering one up .. stay safe

There's a few other things too... There's no glory repairing boards for people... if you do a good job they just want the next and the one after that. Also you should never slag off a board repairer because most other repairers that might have helped you will just tick you off their list. Not worth the agro