EPROM over erasing

I have arcade machine boards going back to 1978 that used eproms that are running fine.

You can still find just about any type of eprom (Even 2708s and those triple supply TMS varieties) as NOS if you know where to look.

I have a Fanuc 5T CNC control built in 1974 that has a bunch of those ceramic EPROMS in it. They still work fine. However, I had another identical control, made one month before, that had a few EPROMS fail about 10 years ago. Eric

It never worked for me in Denmark, 56N

You are replying to a three month old message.

Still....you gotta laugh!

It's an old thread, but I have a story and some time on my hands.

The erase is not the only problem. Charge can leak in or out electrically too. I had a TEK 308 logic analyzer that wouldn't run. I fixed it by reading the EPROM in my reader, erasing it and putting the same bits back in. The data was marginal and wouldn't run at speed, but the programmer was slow enough that it worked. I replaced the chip anyway.

The Compaq Aero laptops had a recurrent "motherboard failure". I discovered that you could pull the EEPROM, read it and reprogram it with the same data. That fixed it for a random length of time. In that case, I think the cause was that the program line was left floating. Some combination of turnon/off transients let random "puffs" of charge into whatever address happened to be on the pins and the thresholds shifted over time until it failed to boot. I fixed several of them by reprogramming. Replacing the chip didn't help.

I like the roadway analogy. Spread gravel on a road. By the end of rush hour, there won't be any gravel in the path of the tires. When a tire hits a bit of gravel, it causes it to move in some random direction. If that direction takes it out of the tire path, it quits moving. Statistically, all the gravel eventually gets displaced out of the tire path. The gravel got erased. But the tires also damage the road. Bits of gravel get embedded in the roadway and can't move out. Eventually, the roadway turns to gravel and can't support the traffic. Getting just the right amount of energy is critical for maximum life. That's why they don't want you to drive a tank down a residential street.

I know.

I still have 1500 out of 9000 messages to read, but I'm catching up :-)

Leif

And there was us thinking you'd accidently reversed the "sent" ascending/descending arrow and not noticed.

I'm a motorcyclist - I'd drive the tank along the line of parked cars.

Hopefully, someone will have a couple M-72 and a cutting torch. Or several thermite grenades to weld the hatch shut.

I only wanted to go back one year, when I discovered this group.

The 237,019 messages is only back to 2003. I've been around here since 1998

Its a fair bet you're the kind of car driver that makes motorcyclists want to drive a tank over a line of parked cars.

You don't know a damn thing about me or anyone else on this group, but you want to make people think you do. I've been driving 42 years and was in one wreck, when a woman came across the center line & hit me head on. My choice was to let her hit me, of drop off the road into a deep ditch. I also backed into an MG midget when a semi back out out in front of me. Instead of backing up when my backup lights came on, he waited till I rolled 18 inches and hit him. Not visible in any mirror, because he was in a triple blind spot. He squalled tires to back up, then came running up to my truck demanding that I get out and fight him, wile the semi trailer was coming towards us. He was so stupid that he almost got backed over by a semi trailer load of cardboard boxes. Plenty off signs that it was an industrial zone and to watch for big rigs, but the self important little prick thought _he_ knew how to drive. There were no marks on his car, so he jumped in it and took off after the road cleared and passed the semi on a double yellow line.

I've been through multiple safe driving courses, including for large military trucks. One was on an iced over parking lot for ice road driving in Alaska.

Only a fool will make your claim, because a bike or small car can slip into your blind spot when you are looking forward. No matter how often you check the mirrors, you won't see them if they ignore the rules of the road. That's why large trucks & buses have warning signs to remind the idiots. Why else would they say, "If you can't see my mirror

- I can't see you." I owned & drove a step van for over a decade. That's 24 feet, bumper to bumper. Over three tons with just side mirrors. It was amazing the number of fools who would follow so close that you couldn't see them in either mirror, but you'd hear their horn when you had to hit the brakes. The absolute worst drivers here are the foreigners who rent a car and ignore all US traffic laws.

Its abundantly clear from your arrogant attitude what you're like.

Yawn. Look at yourself. You're an ignorant ass on several electronics newsgroups, and most people on the other groups have kill filed you because all you want to do is start juvenile pissing matches.

how

With the training and experience listed you still call him arrogant? I don't think so. More like intolerant of a 'wanna be' blowing smoke.

?-)

A lucky guess is the best you'll ever achieve in your life. Now go play in traffic on that tricycle.