Olivetti PCS 286 Rescue Part 2

After having fixed the PSU in part 1 ( • Olivetti PCS 286 Rescu... ), the time has come to take a look at the actual PC, a fine little 286 from Olivetti.
We'll go over the mainboard, the various components found on it, the CMOS setup utlity, tackle the dallas real time clock chip and see if we can get the machine up and running
#Olivetti #Repair #286

[@eduardoavila646]

Another option for these dallas chips is to modify them to add a cr2032 socket and use an external cmos battery on them.

[@МихаилРощин-ю9щ]

so many pleasant memories. the first computer I bought myself. it was expensive for my income, but it made my life and professional growth a lot easier.

[@ToTheGAMES]

That motherboard is layed out so clean, I love it. All those straight line traces makes it look somewhat futuristic. Thanks for the video!

[@RetroSpector78]

Nice piece of engineering ... but still need to figure out where that cap came from :)

[@ToTheGAMES]

@@RetroSpector78 Do you have high resolution images? I'd love to take a peek

[@Inject0r]

What @@ToTheGAMES said. I'd love to assist :)

[@OjStudios]

The Matrix is strong with this motherboard.

[@Robo10q]

Steve Jobs made Burrell Smith rework the original Macintosh motherboard so that the layout was clean like an organized city.

[@PaulBosMusic]

Grinding teeth as the screwdriver rests on the tiny traces prying the Dallas chip. Damage can be seen at 7:22. Try a pulling tool or a plastic spudger instead. I sheared a trace off of a motherboard like that once during recapping, was a trip to fix, learned my lesson.

[@azzajohnson2123]

Yep plastic or even a wooden spudger is the best way to go.

[@hipwave]

the best thing is using a desoldering station. Or being really an ace with the pump

[@emprsnm9903]

Agreed, those Connor HD's were a thing of beauty and reliability in their engineering. I have never experienced a more trustworthy drive/manufacturer since. WD came in a close second though (I think they might have aquired Connor). When I saw the top drive cover, I knew who made it and it was like seeing a long passed friend again.

[@schutz85]

WD did indeed acquire Conner. I'm pretty sure their caviar drives were just Conners with a WD sticker on them.

[@benrogersdevon]

@@schutz85 I think I acquired a ~500MB Conner hdd which was from a 486 dx2/33 I think. I know that Quantum HDD’s were taken over by Maxtor but cannot quite recall when the acquisition was. AOC monitors were basically just renamed LG units.

[@alfabètagamma-k7p]

@@schutz85 Conner was taken over by Seagate Technology. The Seagate series around 1,2GB ~ 2,1GB were typically shaped like a Conner, and still had the same sound. (the ST31276A was a very good example of a rebadged Conner.)

[@LorisModenaArteinformaticaRM]

What memories, it was my first PC (after the C16), with a B&W screen and dot matrix printer. I integrated the first Sound Blaster...

[@the_kombinator]

Ouch - Connor hard disks. I've not seen a working one in decades. Many have been discarded from my retro parts bin over the years : no survivors. Astounding to see one in working (and what seems to be quiet) condition.

[@RetroSpector78]

Think all of my connor hard drives are still working :)

[@the_kombinator]

@@RetroSpector78 Go buy a lottery ticket ;) - even in the 90s when I worked at a computer store, these were looked down upon and/or the reason the PC made it to the shop in the first place. I've got a CP3184 that works one in every 4 times I try to boot it :(

[@s8wc3]

Conners made before 1995 or 1996 were quite good. They fell into hard times then and made unreliable disks before finally being bought.

[@the_kombinator]

@@s8wc3 Really? Those are the ones our shop (and myself) had the most trouble with back in the 90s. These days, when I buy a lot of untested hard disks - always - the Connor drives are DOA. It's to the point where I just tell the shipper to toss them straight into the garbage if that'll make the package lighter and cheaper to send. Hell, I've seen early MFM drives that are more reliable than early Connor drives.

[@BollingHolt]

I've said it before, and I'll say it again. I love that unique startup sound that Conner drives make! My first IDE drive was a Conner 40 meg on a "hard card". I wish I still had it.

[@RetroSpector78]

Yeah ... its amazing how every brand has this distinct sound they make.

[@PaulinesPastimes]

Interesting and informative video as usual . I really like the design of Olivetti computers. I briefly owned an M290 way back in time. Love your channel.

[@catriona_drummond]

Yeah they are kind of nice. I like their looks too and the clever ways in which they are put together.

[@massimo79mmm]

i just bought a pcs286 (i started in 1990 with a pcs86) and this video was very useful! thank you!

[@jeffm2787]

Very wise to replace those x2 caps. Smoky room waiting to happen.

[@kirbyyasha]

I love the "Resident Diagnostics" that Olivetti used. I have two Olivetti PC's, and it just looks cool to see.

[@DxDeksor]

The floppy disk and hdd not working because of the missing riser is a way to become crazy if you don't think about this XD

[@RetroSpector78]

Yes. Because you are trying all sorts of stuff (cables, psu). Because I thought the onboard ide/floppy controller was broken I needed to add the riser card as I was testing with a separate 16 bit ISA controller :) So things got really confusing then :)

[@DxDeksor]

@@RetroSpector78 This makes me think that I have a LPX motherboard from which the IDE controller stopped working, for obscure reasons ... What if the riser is required ?! :o I'll check that this weekend lol

[@dminalba]

The Olivetti PCS 286 was the first PC compatible my family ever had the software pack came with MS-DOS 3.3, Microsoft Works 2.0 and Ports of Call. I remember dad ordered MS-DOS 5.0 but when dad ordered it he inadvertently ordered the 5.25 inch disk version instead of the 3.5 inch disk When dad upgraded to a Compaq 486 he gave me the Olivetti which I used until I could afford my Pentium windows 95 PC.

[@osgrov]

A beautiful machine. So simple, and yet elegant. Glad you got this one back to life! Conner hard drives by the way, they were great for sure. In the early 90s I worked at a PC maker who shipped thousands of them, particularly the 40MB and later the 120MB were very popular. They almost never failed! I would know, I was their only tech support, hehe. What mostly went poof back then were memory sticks and power supplies. I don't want to know how many crap power supplies I've replaced..

[@CRG]

Very similar to the bios on my Olivetti 386SX. I do love these old machines, keep up the good work.

[@RetroSpector78]

Thx a lot ... glad you like it .... Olivetti 386 is coming up in one of my next videos.

[@maverick85ale]

Amazing work! My first computer was an Olivetti M250E.. beautiful memories!

[@RetroSpector78]

yeah they are great little machines.

[@electronash]

6:46 - I would definitely recommend a cheap (ish) desoldering station like the Duratool/Rhino ZD-917, which is made by Zhongdi. It makes a huge difference with helping to protect the vias and surrounding traces. Definitely one of my favourite purchases from when I was working on more through-hole stuff. #notspam For multi-layer boards like that, it's best to add a bit of fresh solder to the joints before de-soldering, and a small dab of flux. Then allow the desoldering gun to heat the solder through to the top side of the board for a few seconds before pulling the trigger. I personally never really got on with using solder wick for jobs like this. I do use it for removing solder bridges for SMT work, though. Also, if you do want to try using solder wick, it's best to snip off smaller sections of it, so the rest of the copper doesn't act as a heatsink and the heat away. ;)

[@RetroSpector78]

Thanks for all the good tips ... will take them into account .... have a desoldering station sitting in a box for over a year now ... should really open it up ... might do a video on it :)

[@electronash]

@@RetroSpector78 That would be a good vid. ;) There is a bit of a method to using the desoldering station that I like to call "the jiggle". lol ie. letting it heat the solder for just long enough (maybe 3 seconds max), then whilst holding the trigger, carefully jiggling the pin to free up the solder around it. (But putting very little pressure on the via / pad.) It also helps to hold the PCB vertically if you can (the rubber ESD mats help stop it slipping), so the desoldering station isn't working against gravity. The component should then pretty much just fall out of the board.

[@boristhespider8230]

I also strongly recommend desoldering stations for this sort of work. Bought a Quick 201B a couple of years ago, and while the fit and finish is a bit ho-hum in places it's been an absolute godsend.

[@RETROHardware]

These snakes are good for specific places. For parts like this is station with compressor best choice = fast and clean work.

[@Hal9526]

Love that Olivetti design.

[@RetroSpector78]

yeah lovely little cases ... love those early desktops (286/386/486)

[@Fredjoe5]

Looks like the manufacture date of the Dallas chip was the 11th week of 1990. I well remember testing and replacing those many eons ago now in an Intel factory :)

[@kaczan3]

0:00 I'm in love with that HighScreen PC case.

[@NeilM1]

You should try to get a copy of Olitext (Olivetti's DOS Word Processor). I used to run it on an Olivetti 8086 PC with no hard drive and 2 x 5.25" floppy drives. One was used to run DOS and the other ran the Word Processor, all on a green screen monitor. Happy Days!!!

[@RetroSpector78]

Have an Olivetti M19 XT that I hope to feature here soon. So you might end up seeing it here.

[@MegaUpstairs]

The BIOS already had a Jurassic Park menu in the 80's :D

[@gabrielebiffi9018]

Oh, I see you used the easy way to fix the battery, I went the hard way, cutting the chip and soldering a new battery to the original pins :-)

[@RetroSpector78]

Been there done that ... but don't like the hassle of cutting those dallas chips ... makes a mess and I am not super handy with a dremel tool :) I also like the aesthetic more without the coin cell :)

[@BaneMcDeath]

I hope to see a part 3 with some fun with programs. I had such a blast with accounting and typing on a similar machine back in the day. My typewrite and manual spreadsheets were jealous.

[@AlejandroRodolfoMendez]

Awesome work

[@nickolaswilcox425]

an alternative to buying new parts for that timer chip is to cut it open and replace the battery with your preferred method, ive done this a couple times, never had an issue aside from the annoyance of getting at the battery leads inside the chip

[@oblitum]

Love this computer

[@MegaManNeo]

I had to laugh at the German MS-DOS because it always feels odd to see my native language in English videos 😂 But that 286 comes close to the one my dad had when I was still very young. Can't recall specs or exact looks of it but I know it said PC286 on ita front and keyboard.

[@RuruFIN]

Now it needs a sound card :)

[@nick11927]

Perfect!!! Love your content man

[@RetroSpector78]

thx a lot ... appreciate it.

[@HighwayHunkie]

Again.. First LIKE then Watch. Very informative footage. Thanks much for the good content and the proper english. Hehe

[@RetroSpector78]

thank yoe vairy mutch :)

[@revoltosotintan]

Nice CRT ❤

[@HoboVibingToMusic]

These kind of videos are really satisfying! Sucks that most PCs are rather expensive nowadays :P At least i got my commodore set :D

[@RetroSpector78]

Need to get start sorting out my commodore / amiga collection also .... fond memories of those as a kid growing up before I got my first PC. (c64 / amiga 500 / ....). But as of late these PCs have taken up the bulk of my time (and space)

[@HoboVibingToMusic]

@@RetroSpector78 I can understand it, i honestly never saw anything before late gen p3 as a kid. And here i am. C64, Amiga 500, and in future a Tandy 1000! Mostly inspired by videos like yours, adrian, 8bg, lgr etc, etc. :D

[@bradmccartney187]

I like your Videos, they are very Educational.

[@crapcbm]

you can open the dallas chip on the top with a dremel and solder other battery to it

[@ocayaro]

Childsplay for some of us from the days of Sinclair's Spectrum ZX, IBM AT/XT, MSDOS 3.0-3.3 and Windows 3.0, 3.1. Good restore, still.

[@jackthelad9933]

I enjoyed that. Thanks.

[@GianmarioScotti]

"New one"? The date code seems to indicate a 2016 part (December 2016), assuming that Dallas/Maxim uses the yyww datecode format.

[@KomradeMikhail]

2x Floppy drive channels ? Highly uncommon, and useful... I have a rare i486 mobo with 2x floppy channels and 4x drives, that I use for imaging different disk sizes and formats that are not always compatible or accessible in other machines.

[@Stoney3K]

The 2 floppy channels are because the case also has 4 3,5" floppy slots. But I've never found more than 2 floppy drives to be useful.

[@KomradeMikhail]

@@Stoney3K I have 4x drives because the High Density drives often don't handle Single or Double Density disks correctly.... They usually read okay, but can't always write correctly. And Single-Sided is also a problem. So I ended up with: 3.5" HD 1.44 MB 3.5" DD 720 KB 5.25" HD 1.2 MB 5.25" DD 360 KB It's basically an archival and conversion machine to support other retro rigs... But this Olivetti is slightly less useful with the lack of 5.25" drive bays.

[@Stoney3K]

@@KomradeMikhail Yeah, I can't really see a use case for 4 3,5" bays. You can have a 3,5" HD, a DD, and maybe a tape drive, but that's about it... and populating all 4 slots with disk drives would leave no room for a hard disk.

[@neilshep50]

You didn't mention that the empty IC socket next to the RAM slots will accept an 80287 maths coprocessor. I used a PCSII-386, which was sold to me with a massive 40mb hard disc. I was told I would never fill it up! Room for about 6 photos from my DSLR now!!!!

[@sebastianchibrac4877]

Nice PC. It's so hard to get cheap vintage hardware on eBay..

[@RetroSpector78]

Hardly ever buy stuff on ebay ... unless I really need something very specific and don't have the patience to wait for a local listing. But doesn't happen a lot.

[@gbclab]

I'm in love with my first PC!

[@zoomosis]

I hope you find where that stray capacitor came from. That's a bit concerning! Very strange for a PC from 1991 to only have two low capacity drive types allowed in its BIOS. A brand new replacement 20 or 40 MB drive would've been increasingly difficult to source even a few years later.

[@pivanow1]

When I get a computer with this Dallas chip, I prefer servicing it to add an external battery (2032) instead of changing it, just because I don't intend to give more money to Dallas when the battery fails again. It's a dirty service, but not complex, and it works fine.

[@RetroSpector78]

Don’t like the look of the coin cell on top of the dallas. And not really handy with a dremel ... perhaps need some additional exercise :) have plenty of chips I can rework :)

[@pivanow1]

​@@RetroSpector78 I watched the video where you make lots of jumpers in an oxidized 386 motherboard and it looks you're good servicing small pieces, so don't be lazy hehehe. Look, I've been watching all your videos and they are very good. Congrats on it.

[@Catonzo]

Didn't you say you were worried about the resistor in the PSU? Why not add some tiny heatsink to it to add longevity? Not that it hasn't already proven its longevity already. I suppose it's made to handle such temperatures and it's probably not going to exactly be seeing heavy usage like an everyday computer would.

[@intel386DX]

Make part 3 with cleaning the PC :)

[@GuybrushThriftweed]

Lol!

[@RetroSpector78]

Looking for an outsourcing partner for that :)

[@intel386DX]

@@RetroSpector78 :D BTW try to enter the BIOS SETUP from Windows 3.1 (the last version that runs on 286) As I mentioned in the your perevious video on my 386 IBM thinkpad 300 under Windows 3.11 and 95 you can acces the BIOS SETUP under any OS (DOS Windows) - I have to try under OS/2 or CP/M :D hehe

[@GuybrushThriftweed]

@@RetroSpector78Don't look at me. I have enough work here :p

[@SharkoonBln]

@@RetroSpector78 Send it to The 8-Bit Guy and he´ll make it look like it´s just out of the factory ;)

[@RogueScholarMDC]

On board VGA, floppy/drive connectors and ram slots seems pretty advanced for a 286. Wonder how much this cost new.

[@BlackGymkhana]

IDE on a 286 motherboard?

[@zoomosis]

I believe IBM's PS/2 range beginning in 1987 all had IDE on the motherboard. Evidently the Olivetti PCS 286S in this video is from 1991, so by the time it was sold seven years had passed since the release of the original IBM 5170 PC AT. By 1991, MFM drives were completely obsolete and new ones were rare. I own a Compaq Portable II from 1986 which was one of the first PCs to use an IDE interface as standard (though it requires a separate expansion card). Super convenient as I was able to swap the original 20 MB mechanical hard drive with a much larger CompactFlash card, using a cheap adapter.

[@dLLund]

this same author, one of my faves, has another video w/ an 8088 xt clone w/ ide on the mobo. a phillips 3120, or similar, as i recall. a very late-vintage 8088, maybe 1990 ? pls take care n stay safe.

[@peteuk111]

My first PC was an Olivetti 386/25. Had exactly the same BIOS and the internals look almost the same as I remember. Upgraded the RAM from 2mb to 4mb and added a Soundblaster 1.5 so I could play Doom :D

[@RetroSpector78]

Pete Richardson how did that work out for you on a 25mhz 386 :)

[@peteuk111]

@@RetroSpector78 About as good as you can imagine. Low quality and postage stamp sized screen lol. But it was Doom :)

[@SharkoonBln]

@@RetroSpector78 From personal experience: Doom runs well on a 386SX 16, even with a crap Trident TVGA graphics card and speaker.exe instead of a fancy soundblaster ;)

[@UltimateElectronicFun]

Great video mate! I have an Olivetti Pentium 75 computer I scored from the roadside. Has the same annoying Dallas RTC chip. Is there any technique for de-soldering the chip using solder braid? I'm having extreme difficulty de-soldering it.

[@niino4329]

10:47 In the background on the right you have a PC branded with "CPA" or "PCA". I once had such a PC as a child but couldn't find any information on that brand or manufacturer. This is my first time seeing this logo in years. Can you tell me more about that brand or manufacturer? I am looking for that exact PC I had back then.

[@matthewplehn4271]

Im sorry i just cant take your word for it..youll need to put that in a video

[@RetroSpector78]

I knew it :)

[@Chipz0r]

Wow not seen a bu508 in ages , but however the bu508a is just a transistor and the bu508d has a diode from collector to emitter , don't know if this makes a difference in this application .They used to be abundent in TV's

[@forkless]

Well that's a brand name I haven't heard in the last 30 years.

[@dLLund]

interesting that the mobo has 2 separate fdd headers, instead of 1 fdd header and a 2-drive cable [w/ twist for a:]. i noticed flat fdd cable when you disassembled in part #1. is the fdd set to ds1 or ds0 ? please take care n stay safe.

[@WalnutSpice]

Should see if you can get Windows 3.0 runnin on this thing & show what all it's capable of. Don't see too much of this older 286 stuff around here on youtube. At least newer quality stuff like this

[@dykodesigns]

That’s probably the nicest bios setup system I’ve seen so far on a pc of that era. It looks so much smarter and more sophisticated then your typical Award and Ami bioses. But I wonder why and how AT and ATX systems handle 360 kb floppy drives. I was thinking about getting a Teac Drive for use with a BBC micro and a pentium 2 / pentium 4 machine and read that there is different behaviour on pin 34 of the interface. Appearantly it’s got something the the Ready and Disc Change singal behaviour. Turns out that (after some research) that the Teac FD-55BV only supports the “ready” signal and no “Disc Change”. Would that even work on an AT/ATX machine? How did IBM do this with the 360k YD-580 in the AT? Are there 360 k drives with Disc Change jumper option? I’m really curious about this. (Learned so far that the AT changed a lot of things compared to the XT).

[@maniatore2006]

German MS DOS ;) My 286 PC has just 640 KB RAM, but runns Windows 3.0 :)

[@the_kombinator]

The bootup report says it's an i80286 - you mentioned that it was an AMD. I wonder if it is second-sourced. What does something like syschk or NSSI report it as?

[@RetroSpector78]

Will leave you in suspense for that in part 3 :)

[@the_kombinator]

@@RetroSpector78 Subscribed :D

[@jkarra2334]

I remember when i was drooling over these in my local pc store, i was just got my first job and back then the price of pc was like 4 x of my monrhly salary. 😁 I bought that olivetti anyway and regretted it almost instantly as it was somewhat between mediocre and bad compared what my friends had... 😁 And my next pc was almost double the price compared to that olivetti.

[@Magic-Enlightenment]

Do you have a closeup / more information for the power supply showing where the two drive connectors are soldered to the power supply? I have a PCs x86 with one power connector and would like to fit a second for a harddrive or second floppy

[@santi308]

Why don't mod the dallas chip adding a cr2032 battery holder on it

[@VK2FVAX]

Is the reason the FDD and Fixed Disk detection error without the reiser card due to the blue resistor packs on the reiser card providing bus termination?

[@RetroSpector78]

Possibly ... haven’t looked into detail on how the isa bus works ... but you might be on to something.

[@uctumi]

awesome! now run some games on it!!

[@jirkakirchner1107]

LOV YOUR VIDS

[@RetroSpector78]

wow you guys are quick ! :)

[@thecoolinventor4379]

Hello I have a Honeywell 4024 with Siemens 8088 it runs but where can I get a keyboard for it, it has 5 pin din I think. Thanks

[@RetroSpector78]

It is a standard XT keyboard (allpinouts.org/pinouts/connectors/input_device/keyboard-xt-5-pin/). These should not be that hard to find ...

[@bundesautobahn7]

I noticed the MS-DOS that was already in the harddrive was in German, but the phone number on the sticker isn't a German one. I guess the computer came from Switzerland?

[@RetroSpector78]

Not sure of its origin. PC came from a gentleman living in Germany.

Envy...

[@eliotmansfield]

PCS range was their cheap versions to compete with the likes of Amstrad. The higher quality business ones were typically Mxxx

[@jaybrooks1098]

Is olive-tti a oem that commodore used for its PC?

[@nticompass]

Any idea as to why adding the ISA riser card fixed the issue with detecting the drives?

[@RetroSpector78]

Not really. My guess is that there are some resistors / capacitors on that riser card that are needed for stuff on the isa bus to work properly. (Even the embedded floppy / hard drive controllers that use the same isa circuitry that external expansion cards use)

[@bratticuss]

I think the Riser card acted as a termination to the ISA Bus.

[@cesteres]

It did have a coprocessor also?

[@HylianOverlord]

Those are not proprietary connectors for the power supply.

[@Edman_79]

At 1:38 you describe the CPU as an AMD. But I can see an Intel 1982 text on the chip. Also the diagnostic screen says CPU (i80206) which should be Intel. Am I wrong?

[@RetroSpector78]

Think every AMD 286 cpu had an intel 1982 copyright on the bottom. But will double check. Thought I saw the AMD logo just left of the heatsink. But have to admit I didn’t pull of the heatsink.

[@Edman_79]

@@RetroSpector78 See? That's also new for me :) Every AMD 286 with an Intel logo. And I should already remember that, I'm old enough. I learn something every time. Thanks for these videos!

[@bratticuss]

At the time both AMD and Intel co-developed the 286 for the IBM AT.

[@CPUGalaxy]

Nice video and cool to see the Olivetti coming back to life. Keep up your good work and highly appreciated content. Greetings from kzbin.info

[@Katsura82]

I've just bought this computer but it's not working (sold as "untested"). In the initial test screen I got an error message. "Keyboard Error: 8 Press F1 to continue". I've tried with five different keyboards and nothing; keyboard is not detected. Any clue? Thanks.

[@the_kombinator]

Those RTC chips are the worst. I end up cutting mine up and converting them to button cell - no need for a socket ;)

[@RetroSpector78]

Also done that before but it's a bit of a hassle :) I just order new ones :)

[@the_kombinator]

Hmm, maybe it is easier. Where did you get a replacement from?

[@RetroSpector78]

The Kombinator rs components

[@the_kombinator]

@@RetroSpector78 Thanks - that's about $25 CAD though, plus int'l shipping. My batt cell method is cheaper, and with leftover funds I can buy some vodka. Nice to know there are new ones in case I absolutely need it. :D

[@RetroSpector78]

The Kombinator mmm... think I paid 9 EUR. Incl shipping.

[@andreustap]

May I have the pinout voltages for the Olivetti PCS 286 PSU?

[@14272nuno]

I want it to... Can soneone help?

[@derHutschi]

does it run Crysis?

[@Nukle0n]

Are those Mouse and Keyboard ports PS/2? or something incompatible that also uses a MiniDIN connector?

[@RetroSpector78]

it's PS/2

[@cdos9186]

Does the 24 pin ic socket have to go in a certain way? Also can you send me a link to where you get your ic sockets because I am in need of one for a dead Dallas Real-Time chip.

[@zoomosis]

If you solder the socket backwards the key will be at the wrong end. Consequently you (or someone else) will inevitably insert the IC around the wrong way. The socket isn't specific to the clock chip. Any DIP socket with the right number of pins should work. They are all over eBay.

[@cdos9186]

@@zoomosis Do you mean if you solder the socket in upside down? What I am trying to say is if you get the socket, it doesn't matter whether you flip it to the right side or left because they are parallel to one another?

[@14272nuno]

Hi there. I have the same computer but with a diferrent problem. I've changed the electrolitic capacitors, bulk capacitor, x2 filters, y2 supressors, and the fast switching power transistor with the bu508aw , and the power works but when i measure the +5v , for example, the reading goes from +3 to +7... Big amplitude. The same with the +12 line.. só i'm scare to conect the mainboard... What can bem causing this amplitude.. the AC part or the output DC circuit??? Last time i turn it on the 10k 4w resistor near the TDA ic started to smoke.. any help? By the way can soneone give me the power supply pinout?

[@wildlifeamateur]

my pcs 286 shows this error on booting: Resident Diagnostics Rev. 1.37 CPU (i80286) pass I/O Controller pass ROM Checksum pass Memory Refresh pass Keyboard Controller pass CMOS RAM Error : 1 Press F1 to continue then it goes in a loop restart

[@douro20]

Was this computer built in Ivrea?

[@matti157]

douro20 I think Scarmagno plant

[@slicknick1213]

BU508D has in internal diode where the 508AW does not. Be aware.

[@intel386DX]

Hey the second part :)

[@RetroSpector78]

Enjoy it sir ....

[@angrydove4067]

Please clean the sticker debris from that nice IBM monitor.

[@darnice1125]

CPU says Intel, not AMD.

[@RetroSpector78]

Every 286 CPU has an intel copyright on the bottom. Also the AMD ones.

[@AlessandroCussino]

Today the company still exist but nearly all products are made in China :-/ P.S. GREAT VIDEO :-D

[@phreapersoonlijk]

Also, please keep in mind, on the cheaper ir thermomiter tools, the aiming laser is quite often a little off, sometimes a lot !

[@RetroSpector78]

I bought it to identify some hot spots , and this resistor was one of them .... PC seems to be working fine ... output voltages are clean, no weird noises, and have had it on for several hours straight. So hope all is well.

[@phreapersoonlijk]

@@RetroSpector78 yea, just don't let yourself get all paranoid and measure all the things all the time ! :D

[@DVRC]

How did you got into the BIOS of this machine? At school i found an Olivetti M28, and the battery is dead (so it can't boot from hard drive)

[@RetroSpector78]

Str1kernaut shown in the video :) shift - ctrl - alt - del :)

[@seeloewen]

11:12 Looks Like a German Version of ms-dos 🤗 Anyone German Here?

[@RetroSpector78]

PC came from a nice gentleman living in Germany :)

[@MegaManNeo]

Moin und willkommen im Club 🤓

[@seeloewen]

Moin 🤗

[@HighwayHunkie]

will ihn jemand kaufen? hehehehe

[@retropcs88]

Me

[@hipwave]

Resident diagnostics v. 1.37 , my PC-1 has v. 1.21 . Just for the info in case someone cares

[@abooogeek]

The PC-1, the one that looks like a 8/16-bits computer from the 80s like an Amiga or AtariST?

[@hipwave]

@@abooogeek Yes and it has a Conner CP-3026 20 Mb Hard disk ("assembled in the USA", it is ages since I last read that on something) inside in place of the left-side FDD (they are 720K). The bad thing is that it uses a proprietary mouse on a port that only looks similar to a COM port, its serial is off standard and the original mouse is so rare. Never seen one in the flesh. So no mouse operation under Windows 2.03 :-\

[@androgyne_sander]

Are those mouse and keyboard sockets PS/2?

[@RetroSpector78]

Classic Computer Shop yes

[@kwanchan6745]

the model M keyboard is worth more than the PC

[@only257]

📼

[@phreapersoonlijk]

Wait, somebody likes Connor drives? I've pulled like 4, maybe even 6 out of old laptops, because they were dead. They were also the only Connor drives I have, and at a 100% mortality rate, I'd not consider them built like tanks. :D

[@RetroSpector78]

Phrea Nix it differs for a lot of people I guess :) here its mostly seagate that breaks (old and new)

[@phreapersoonlijk]

@@RetroSpector78 yea, Seagate is notorious too, though in recent years they seem to have made quite the effort to better their drives. IBM Deskstars were another example of bad drives, and not to forget ALL of the Maxtor drives. :D

[@RetroSpector78]

Phrea Nix haha :) had a seagate external 3 tb hard drive completely die on my without any notice. Sent it to a data recovery but they could only recover 70% and no files larger than 100mb

[@bratticuss]

I have had always good luck with Connor, Western Digital, IBM Desktar, and Maxtor drives. Seagate on the other had were always garbage. Still junk to this day compare to other brands.

[@SharkoonBln]

@@phreapersoonlijk You forgot the worst HDD brand in computer history. KALOK :)

[@samarth49]

Hey!

[@RetroSpector78]

first one ... jeez that was fast :)

[@samarth49]

@@RetroSpector78 Yeah! Really love retro PCs

[@fnglert]

Such an empty, sparsely populated motherboard.

[@zoomosis]

A huge contrast from the original IBM 5170.