13th Apr 2021, 7:43 pm | #1601 | |||
Octode
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Re: Non-working Commodore PET 3016
Ah - apologies. I took a known working plunger and used that to test every single key on the PCB. Not all the plungers work however.
Here's an incomplete list of PETs in films http://www.starringthecomputer.com/computer.html?c=39 http://www.starringthecomputer.com/computer.html?c=178 https://www.commodore.ca/commodore-g...-in-tv-movies/ The IBM PC was released in 1981, so there was a bit of cross-over by 1984. I can remember installing the 50th IBM PC at (what was) Norwich Union - that was an event at that time. Colin. Quote:
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13th Apr 2021, 8:08 pm | #1602 |
Octode
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Re: Non-working Commodore PET 3016
I changed the rubber belt in one of my datasettes and plugged it into the back. Bearing in mind the cassette that I picked has not been used for 40 years, it loaded and worked first time. After everything that has happened with this PET, I guess we were owed a break.
Colin. |
13th Apr 2021, 8:10 pm | #1603 |
Dekatron
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Re: Non-working Commodore PET 3016
I didn't realise the PC was so early, I wasn't really aware of them until the late eighties / early nineties.
Do I not remember seeing a PET as a constant fixture in amongst the background clutter in Leonard & Sheldon's apartment? (The Big Bang Theory). I had a rummage around at work today and found some rubber dome contacts (image attached). The outer rim is 15mm outside diameter and the 'unpressed' height of the dome is about 5.5mm. I remember I harvested these from a PC keyboard that was being scrapped for some reason. I think I kept them as potential spares for one of my Atari ST computers but I don't even know if they are the same size as the Atari ones. Anyway, if the PET ones can be removed from the plungers and these ones are the same size, you are welcome to a few - they would probably be a bit more hard wearing than any paint-on coating you can find. |
13th Apr 2021, 8:14 pm | #1604 | |
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Re: Non-working Commodore PET 3016
Quote:
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13th Apr 2021, 8:40 pm | #1605 |
Octode
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Re: Non-working Commodore PET 3016
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13th Apr 2021, 8:43 pm | #1606 |
Dekatron
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Re: Non-working Commodore PET 3016
That's about the period I would have expected for the PET but I thought the PC (...not the PET) was quite a bit later. (Originally, this was me musing over whether the use of PETs in WW: 1984 was a little bit off target).
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13th Apr 2021, 8:48 pm | #1607 | |
Heptode
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Re: Non-working Commodore PET 3016
Quote:
Was the Pet successful in France? It's one of those international marketing pitfalls. It's French for "fart"
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13th Apr 2021, 8:54 pm | #1608 |
Octode
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Re: Non-working Commodore PET 3016
Oh my bad. Missed the PC reference. I saw my first XT about 1985 and that was a clone so I guess they were originally made a bit earlier. But it was late 80s/Early 90s before they started sprouting like mushrooms in offices. I fondly recall the old Apricot computers with the then revolutionary 3.5" floppies!
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13th Apr 2021, 9:19 pm | #1609 |
Dekatron
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Re: Non-working Commodore PET 3016
Getting back to Colin's triumph over PET adversity, I wonder what else he has on those old cassettes? He's probably just in the process of finding out.
I noticed his original post about this machine from 2012. If we (dubiously) count that opening salvo nearly nine years ago, then this would be one of the most epic repair sagas ever featured on the forum. https://www.vintage-radio.net/forum/...ad.php?t=83791 |
13th Apr 2021, 9:46 pm | #1610 |
Dekatron
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Re: Non-working Commodore PET 3016
The original IBM PC was launched as long ago as 1981, but IBM-compatible PCs did not really "take off" in the UK until the mid to late late 1980s, with the launch of the Amstrad PC1512 and 1640. Until then, the few firms that had already adopted 8-bit computers were still squeezing the last drops of life from them; and RM and Acorn had the education market pretty much to themselves.
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13th Apr 2021, 9:47 pm | #1611 |
Octode
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Re: Non-working Commodore PET 3016
Here's something that takes me back a long way....
Now to build a speaker. Colin. |
13th Apr 2021, 9:50 pm | #1612 |
Octode
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Re: Non-working Commodore PET 3016
And here's some photos of the original tapes I have. I know they're 42 years old because I either got them with the PET or I bought them at the time when I won it.
I've plenty more tapes which contain games/code I typed in prom listings in Personal Computer World too. Colin. |
13th Apr 2021, 9:54 pm | #1613 | ||
Octode
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Re: Non-working Commodore PET 3016
PS/2s were released in 87 - I worked at Norwich Union and we had thousands of them in the end. I remember them fondly - they were expensive but very very reliable and great to work on. Everything plugged in and out easily.
We were a big OS/2 shop as well - that was my career for a while. Colin. Quote:
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13th Apr 2021, 9:59 pm | #1614 |
Octode
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Re: Non-working Commodore PET 3016
Well that's a huge nostalgia rush for me! I spent hours playing that after school on the school PETs (my PET had v1 ROMs and wouldn't run it). I did use the speaker set up to make "music" on my PET though.
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13th Apr 2021, 10:08 pm | #1615 |
Dekatron
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Re: Non-working Commodore PET 3016
Quite pricey for the time, some of those. I remember thinking it was a black day when, after years of Spectrum titles costing about £5, Ultimate-Play The Game suddenly decided they could get away with charging £9.99. And that was several years later.
I notice you said you'd paid £25 for the PET originally, although you had to drive quite a long way to pick it up. I wonder if you've dared to add up the real cost of the repair? I suppose it's not too bad if you look on it as a kind of open-university course in computer repair with a working computer thrown in at the end. Plus you now own a few useful tools, such as your scope, which is such a universally handy thing to have that it doesn't really count as part of the cost of the PET project. |
13th Apr 2021, 10:14 pm | #1616 |
Octode
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Re: Non-working Commodore PET 3016
I can vouch for the Scope thing - he persuaded me to buy a digital storage one for a job - use it all the time now
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13th Apr 2021, 10:18 pm | #1617 | |
Octode
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Re: Non-working Commodore PET 3016
I've been tracking it.
Overall I've spent £239.91. Out of that, £92.47 was the scope/meters/Arduino so I've still got all of that. Also, I tended to overegg my Cricklewood orders in case I cocked anything up, so i have several new ICs and sockets left over, along with a replacement 6502 (£15) that I bought just in case. I will have to buy some paint yet to restore the case - if anyone happens to know a good match for Commodore PET cases, that would be good. Before we finally call this thread a day, I will put up a summary of the whole event from my point of view, along with what was replaced and what was purchased. Colin. Quote:
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13th Apr 2021, 10:26 pm | #1618 | |
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Re: Non-working Commodore PET 3016
Quote:
Regarding restoration of the casings, I think AJ (ajgriff) might be the man to speak to about that. |
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13th Apr 2021, 11:49 pm | #1619 | |
Octode
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Re: Non-working Commodore PET 3016
Just catching-up on the latest, it was a bit confusing as had started off about repairing keys, when it had seemed they had all done something (even if often giving the wrong thing) originally. Then I saw:
Quote:
- It had seemed it couldn't really be anything else, but good to have this confirmed and hadn't had to pay for anything unnecessary It's probably not been a bad investment money wise (If you exclude your labour costs like they also seemed to on earlier Wheeler Dealers!), especially from noticing some recent asking prices for PET's (especially in the USA) - even higher than >15 years ago. Although still much cheaper than the various IBM's originally cost in the 80's, until Compaq etc. started off all the compatibles after IBM lost the battle over alternative BIOS's, the hardware architecture was quite open, Plus DOS was sold separately by Microsoft. I do recall using IBM's OS/2 on our lab's local server for a while but it seemed MS Windows Server replaced that for many after Windows had caught on. I presume you have tried cleaning again the conductive-rubber plungers, but they still don't work reliably enough. And had wondered if the conductive rubber can be extracted from the plastic and turned upside-down if it is conductive throughout and not just one face, but is seems the outer non-conductive rubber is also the 'spring' on these. I had seen a PET keyboard completely stripped-down, to clean everything, where they said that was the only way to ensure it was reliable: https://www.commodorecomputerclub.co...4032-keyboard/ Rather than suggested fixes, here: https://www.vintagecomputer.net/brow...ead.cfm?id=703 (or the 'silver paint' mixture in that video, which I think was from a Chemtronics? repair kit design for keypads?) I suppose you could always fit the worst plungers on the less used keys - like the numeric keypad - for now. So be able to type the Hello World etc. programs easier... Last edited by ortek_service; 13th Apr 2021 at 11:59 pm. |
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14th Apr 2021, 6:30 am | #1620 |
Dekatron
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Re: Non-working Commodore PET 3016
The numeric pad provides the only way to type numbers on a PET.
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