Dang! I still can do it! <G>

My R2E4 refused to enter the local editor today.

I could type commands, and see them executed on the main console screen, but NADA on my terminal. (Well... THAT's not right!)

I have schematics for an earlier machine, and as far as I can tell, those seem to be the only ones still available. So, trouble-shooting started with finding out that the RS232 ports DON'T come out the EAF board like they used to.

I finally tracked the failing port to the BSP board. This sucker has 121 ICs on it, and is the typical "big board" product of the '80s.

1488 output driver... that has to be it. I _actually_ had one in my junk box, but swapping it gave nothing (it was socketed, so no big deal).

Checked the input to it while streaming data. No toggle.

Checked the output of the UART that drives it -- TOGGLE! Dang!

I finally tracked it down to a broken feedthrough on the board. I installed the traditional "patch jumper" made of wire-wrap wire, and it worked.

Dang! After over 20 years off-duty, I can still do it. Now I have to find a 20-year-old woman, and see if I can still do THAT!

LLoyd

Reply to
Lloyd E. Sponenburgh
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It IS nice to find out, once in a while, that you've still got it.

Bill Cosby said, "Turning forty is seeing a beautiful woman and wishing you could, but being glad that you can't."

Reply to
rangerssuck

Hmmm don't get carried away.

db

Reply to
Dave B

Hmmmm don't get carried away.

db

Reply to
Dave B

He went limp at 40? No wonder he turned into such a judgemental old fart.

Thanks, Rich

Reply to
Rich Grise

Lloyd E. Sponenburgh wrote: (...)

Just like riding a bicycle. Sort of.

--Winston

Reply to
Winston

Ol' Son, you are easy prey! Next question: can you afford it?

Reply to
Don Foreman

Upgrade for R2D2?

--snip--

You GO, girl! ;)

-- Do not taunt Happy Fun Ball!

Reply to
Larry Jaques

Women are MUCH more comfortable and gracious to ride, sir.

-- Do not taunt Happy Fun Ball!

Reply to
Larry Jaques

:) Amen to that.

--Winston

Reply to
Winston

Well, its days are numbered. How many OTHER bad feedthroughs are lurking in there? Geez, if all the chips are socketed, it is a miracle it still works at all. Most of this old stuff, the MTBF starts to head down faster and faster.

I had an Allen-Bradley 7320 control that started to have a lot of failures, and I was SURE glad to retrofit it with something more maintainable.

Jon

Reply to
Jon Elson

Jon Elson fired this volley in news:pO-dnezsn-

4flGXRnZ2dnUVZ snipped-for-privacy@giganews.com:

They aren't socketed. The 1488 and 1489 RS232 transmitter and receiver chips were socketed, obviously after the fact, by an astute technician. They take most of the external abuse the machine could ever suffer.

I agree that this machine needs a retro-fit, I'm just too busy actually making chips to take it down for now. It's quite reliable.

LLoyd

Reply to
Lloyd E. Sponenburgh

What sort of stuff do you make Lloyd?

i
Reply to
Ignoramus13150

Ignoramus13150 fired this volley in news:Z82dnXQn5PMwk2XRnZ2dnUVZ snipped-for-privacy@giganews.com:

...tools and machinery for manufacturing fireworks.

Much of what I do is simple spindle turning work, but one of the things the CNC machine excels at is doing simple profiled spindles with the work in the mill's spindle and the tools hard-mounted to the table.

Another thing for which the machine is indispensible is drilling and boring "cavity plates" for pressing work. When one must drill (on accurate centers) and bore 144 holes in a plate, and have them all align well with 144 pins in another plate, not much else will do. What is a three day job by hand (and always seems to have one "misfit" pin) is about a two hour job on the R2E4.

LLoyd

Reply to
Lloyd E. Sponenburgh

Whittier is LOADED with 20-year old girls, but the problem is they're all Mexican, and have great big huge fat asses. Sigh.

I wasn't raised a bigot, but those illegal criminal Mexican invaders seem bound and determined to change my mind there. Another thing I have noticed is that they're the rudest people I've ever met.

Thanks, Rich

Reply to
Rich Grise

Something that can be repaired if you have access to the components.

I've replaced one so far in our cnc's at work. I added a socket to make the next time a bit easier.

Good work on the troubleshooting, as to the latter, it is better to remember the stud you were than learn about the mature man you are now.

Wes

Reply to
Wes

Yes, certainly.

Well, been there, done that, and my A-B 7320 might have been a bit older, but not much more than the R2E4. It did have a massive array of Elco Varilock pins that hooked up everything on the front panel, and I had to mess a whole bunch with those any time I opened the thing up for any work inside. But, I had 3 component failures in about 9 months. The A-B 7320 was really well built, too, so it was not poor design, just component wearout. It probably had been on for 20 years in its former life.

Jon

Reply to
Jon Elson

For smaller asses, stick with the 13-17 y/o group, ya perv. ;)

When I left Vista, it was being thoroughly infiltrated by illegals. Most were very nice, polite folks and I had no problem whatsoever with them. The few others cranked up their mariachi music and blasted it out the windows 24/7 while dressing/acting like gangstas. Had it been legal, I'd have helped eliminate the pests.

Go, Arizona!

-- "Human nature itself is evermore an advocate for liberty. There is also in human nature a resentment of injury, and indignation against wrong. A love of truth and a veneration of virtue. These amiable passions, are the latent spark. If the people are capable of understanding, seeing and feeling the differences between true and false, right and wrong, virtue and vice, to what better principle can the friends of mankind apply than to the sense of this difference?" --John Adams

Reply to
Larry Jaques

Very nice, I bet the fireworks field requires a lot of knowledge, physics etc.

i
Reply to
Ignoramus13150

Ignoramus13150 fired this volley in news:RpidnSKoYcKc32XRnZ2dnUVZ snipped-for-privacy@giganews.com:

Mechanics, Electronics, Physics, Chemistry... All of it.

It's really fun. I tell my wife, "I spent my whole life training for this job!"

LLoyd

Reply to
Lloyd E. Sponenburgh

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