Leaderboard

No

Been sweating over two CPU boards, the first was a 12k with the usual rot everywhere. New sockets were needed for the CPU, the data buffer and the RAM. These are a real pain to remove, even worse than the chips, especially as the solder has gone crumbly. All the chips needed replacing in the end which isn't unusal on these boards. Unfortunately the CPU ran cold so I knew it was duff too. Shame as these are becoming rarer by the day and that's if you can find a 'real' one. The whole job took just over a day to complete but it's swings and roundabouts in this game. Next one on the bench was a 14K. Don't see too many of these and they can be a pain due to the custom PAL chip. Well in this case apart from being rotten the PAL chip had lost a leg (welded in the socket) and another leg was hanging on for dear life. Not so many bad chips on this one thank goodness but what to do with the PAL? I don't have any spares for these so a bit of creative thought was needed. Thinking back to one of Andrew's earlier achievements of rescuing chips I thought I'd have a go with this one. Using the microscope I had to dig out a small recess to try and find what was left of the old pin. Where it had broken off there was no sign of any metal.After a while I could see something shiny but we are talking human hair widths here!! After a lot of messing about I managed to tack a very fine wire on to it but any movement and it would fall off. Eventually I managed to secure it to a thicker wire which went into the socket. The chip had to be into it's own socket to prevent any more legs falling off. Anyway, not knowing whether the chip was any good or not I carried on faulting. After locating a few broken tracks and vias I switched on (for the umpteenth time) and blow me it only worked.CPU was good too!! I'm pretty sure these PAL chips will have all the security fuses blown so no chance of copying them but I will stick it on my Data I/O and see what it can read just in case, otherwise I'm stuck. Another day's work but very satisfying to see it run.

Came across a stash of NOS PAL's so I'll probably employ those. Didn't realise I had them, it's amazing some of the stuff I've got tucked away for a rainy day. Thinking about it, it was raining.

I’ve not seen them for a while but they used to pop up in an eBay search for TMS9980(iirc they where about 10 quid each) but it was a couple of years ago

You thanked Alan for the file here I've burned this file to gal using something like 'pal as gal" or pal to gal setting and it runs fine on the 14k card. Nabbed a gal off an impact card. Shame I haven't sussed using the palce chip as I got loads of them.

Excellent work bob and you are a true credit to this hobby and everyone you help out. Nice that then9980 has survived on the 14k board too .

Just got to get the machine internally to 100% next. There was also vibrating distortion coming from the speaker... but I'm 20p richer than I was before 😂

Time to go off your nut again with this utterly nutty machine from global big brother of the Awp dx i did a few years back thanks goto Clo06 - classic layout for lamping positions Matty L - images used/ and sound roms Wizard for mfme shortcuts written within the notes Play this in MFME V20.1 Club Utter Nutter £250 Dx.zip Club Utter Nutter £250 Dx.zip

Doesn't sound unreasonable to me.

Please (swear I put it lol)

Finished it today,looks great juke going on tomorrow.

I dont expect to make a profit,just enjoy the machine and get my money back.The way I look at it is I bought a peice of crap,I restored it and now its fully working looking good,so you expect to pay a bit extra if the work is done I believe.

Something like this (Can't remember exactley)

You been on the piss Del??

hi and welcome to the forum

if i was the next door neighbour and on a 50p meter i would tell you to do one!!😂🤣😂 Sounds to me like the power supply swop them out and try a different one something is not right bud!

@PCP Fan they don't half go with a bang! Some smell off them too. Gave me a hell of a fright first time it happened top me! If you're lucky enough then you get a bit of a "warning" fizz and a puff of smoke first.

I was given some scrap I/O boards recently to mess around with so I thought I'd see what could be done. I'll refer to this board as Trigger's broom (Only fools and horses) as you'll see what I mean as we go along! This one started out like this ... Pretty horrific I think you'd agree. First thing was to see if all the muck and grime could be removed. Easiest method for that is shove it in the dishwasher!! After a light 15 min wash it started to look a bit more like it would be worth working on. All the middle rusty resistors had to come out and a new 20 way socket was needed. Next thing was to power up and see what was or more likely wasn't working. Many hours later, this was the result ... Of course it now works a treat but the silicon count was rather high. So you see what I mean about Trigger's broom.

You didn't.

Hi All a longshot but has anyone got a reel to replace this damaged one please ?? or anyone who can make me one or where I can get one made be much appreciated thanks G