IBM 5155 teardown + portable Model F repair. IBMs first Portable PC
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- Опубликовано: 16 июн 2023
- Part 2 here: Hacking the MOBO :) • XT motherboard hacked ...
IBM 5160 Restoration here: • IBM XT 5160 Multiple f...
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Hanstar 861DW Rework Station
Pro'sKit SS-331 Desoldering Station
UNI-T UT61E Auto Ranging Multimeter
UNI-T UT890D Manual Ranging Multimeter
MESR-100 mk2 ESR meeter
PINECIL Soldering Iron
PinePowerPSU
TS-100 Soldering Iron
AMTECH NC-559-ASM Flux
MaAnt Grinding Pen
Multicore 60/40. 0.38mm and 0.5mm solder
TL866 II Plus Programmer
Tektronix 2246A 100 MHz four-channel analog scope
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Part 2 here: Hacking the MOBO :) ruclips.net/video/F_AFgeEWewE/видео.html
Support my work on patreon.com/Epictronics
That dead bug looks like a carpet beetle larvae (baby). Aw, soooo cuuuute! Cheers!!
Yup, larval sheds from dermestid beetles.
I admire your patience! From the risk of breaking the plastic I would keep my fingers away unless it was really not useable. Great video :)
Thanks!
I bought one 5 days ago. It's amazing, just waiting for the IBM PC DOS 2.10 to arrive from USA.
What a fiddly thing! Goodness you have a ton of patience
I had a luggable Compaq similar to this. Thought to make it a sleeper, but never did.
Good to see the miniscribe isn't a brick. But it maybe as useful as one if it decides to not cooperate.
Let's hope for the best
I enjoy replacing the foam in Model F keyboards, but it's very difficult with the 5155 Model Fs. The plates are made out of a lighter, more flexible metal than the rigid steel assemblies of every other Model F. This means new foam does not compress as the metal isn't strong enough to do this. The amazing key feel of a Model F comes from the plates and foam pressing the switch housings tightly against the PCB.
Foam-and-foil kbs suck because basically every one of them left has probably had the foam decompose. God bless membrane keyboards nowadays for portables.
Thanks for the video, I openned up my 5155 PSU to check for Rifa caps, thankfully none there (some PSUs have them on the filter board apparently). At 13:28 can clearly see that the drives are bolted into slots. You only need to remove one long bolt from the other side of the floppy drive and just loosen the other three bolts with a spanner. The floppy drive then slides back and can be removed (if there are no ISA cards in the way) - no need to remove the CRT.
I've just got my hands on one of these, before I open it and start to clean up are there common failure points apart from the tantalum caps? Great news about no RIFA though
Beautiful work on that keyboard restoration! Very cool that you had the same RAM expansion board that I had in my 5150. Looking forward to the next part!
Thanks John, very lucky find indeed. I have been looking for a six-pack plus for ages, not realizing I already had one lol
Just ordered one as well! These things are super cool. Kind of on a portable kick lately :)
The 5155 is awesome :)
Critters looked like meal worms. We had to buy them to feed our chameleon!
You can have these for free : )
Apparently they didn't find much of a meal in that keyboard though :)
Love your videos man, brings back some memories of working on XT's and AT'. Love this.
Thanks
I picked up a Compaq Portable from a fellow who was also selling a Kaypro II I bought for my father. A few months later I found someone selling a 5160 for cheap...I didn't really have a need for it, but I just had to have the Compaq Portable and the 5155 running side by side.
I'm still looking for a Compaq too. It would be an interesting comparison
Wow that's a project! How many pieces and screws and bits do you have scattered on your desk now? :) That keyboard restoration was epic, I'm not sure I would have had the patience to do that! The capacitor soldered on the mains socket should be to avoid sparks when the mains cable is plugged in. You'll see it on modern PSUs as well. Something @TheTechknigt taught me :)
Thanks, The pile was huge! No less than 7 different types of screws to keep track of. But it's now hacked, repaired, and reassembled in part 2 here: ruclips.net/video/F_AFgeEWewE/видео.html
14:50 Yes, the drive cage is indeed a bit too narrow compared to a regular size computer. What I did with my 5155 is to sand the sides of the front plate of the drive. It doesn't have to be perfect because the sides are covered by the 5155's front panel.
Thanks, that sounds like a good hack. I guess IBM didn't check if an HDD would fit since it was only offered with single or dual FDDs.
No notes on the video content. :-) Just loving the new set, the useful teardown / assembly documentation, and the awesome theme music that makes me feel nostalgic for something, but I can't quite put my finger on it. 👍 I guess it just feels like the early 90s.
Thanks :)
I just love the 80s idea of portable. Sure, it's portable if you don't mind back pain afterwards. 🤣
and shoulder pain.
yeah, it's laughable with today's standard :) But imagine back then! About a third of the size and weight of an XT :)
It's a suitcase, when was the last time you did your back in carrying a suitcase?
I always thought that lugable PCS should had wheels like in airport luggage.
Maybe it should have, that thing is insanely heavy
Watching the disassembly of the 5155 was a painful kind of entertainment - what a lot of frustrating design decisions. Though maybe slightly easier than glued-together modern garbage.
Really appreciated seeing the servicing run on the keyboard though. I am working on restoring a Model F 122 and not gathered the courage to tackle the foam yet, due to it being totally disgusting. A little more courage now. Spacebar advice sure is handy too. Thanks.
Thanks, and good luck with the restoration
Hi Wombletronix, did you get round to this? I have carried out a lot of Model F foam replacements. I can give you some advice if you'd like some help.
trip = zip tie, also it’s strip, rhymes with tip, just the tip.
13:55 At least it's not a brick.
What is that pry bar you are using on the knobs and the hard disk? Looks like a handy tool.
That is indeed a very useful tool for vintage PCs. It's a trim removal tool for cars. You can find these on ebay
Northgate OmniKey was the best keyboard ever made.
I hope to find one someday and make a comparison
I have never seen a Model F restoration video, so seeing this was awesome. Luckily the foam pads are available according to google, just pricey. Also, the belts are melting on my FDDs for my 5155 so Console5 now stocks those. And yeah, the drive cage opening is too narrow before the later XT/AT standards defined things. the HDD probably has a stuck stepper because it was flashing an error code in your video.
The other problem I am having, the black coiled keyboard cable is also melting so i need to fabricate a replacement for that.
Yeah, I'll place a drop of oil on the stepper in the next video. I noticed that the kb cord was a bit sticky but it cleaned off with some IPA
@@Epictronics1 Yeah you can clean that cable off, but it'll keep degrading and you get the same result until it eventually cracks and falls apart. We need to find a suitable replacement for that cable.
26:55 I've only ever seen this tool used for punching holes in leather, so that might explain why it doesn't do well with neoprene.
I think you're right. This tool was brand new when I used it on my first Model F restoration and it didn't work well. The neoprene is probably too soft for the tool
What a weird keyboard layout, with European-style keys, diacritics but without national letters. I wonder where it was bought.
It seems they took some Scandinavian keyboard and replaced the ÄÖÅ with US keycaps from a different batch of plastic. Very interesting.
Just wonder how the keyboard was initially assembled! Did the use dental floss too? :)
haha, dude, there is actually a VHS video on YT showing how it was done: ruclips.net/video/mEN6Rry4ekk/видео.html
Looking forward to seeing the motherboard ram modification, was planning on doing the same with mine. What's the model of that hercules card? Rare to see one with the internal composite pin header designed for a 5155.
Thanks. Yeah, that Hercules turned out to be an oddball. It's a Hercules Color Card GB200. More on this in the next video
I'd like to do that to my 5150 but I'm afraid of ruining my original 5-slot mainboard.
@@douro20 I think an AST six-pack plus or similar is the way to go with the 5150
@@Epictronics1 I have a 640k memory card. I want to eventually eliminate it but I want to get another mainboard first.
@@Epictronics1 Thanks for the model number, overall is the card an improvement compared to the factory IBM CGA? I've been looking for ways to get rid of the notorious snow effect, but the ATI Wonder cards are ludicrously expensive
Please consider getting a nut driver lol
Better than using a Flathead Screwdriver.
Edit, oh you do have one, just not the right sizes?
Yeah, I have all the common nut drivers. But this PC was nuts ;) it had 7 different screw types and some I didn't have the proper tool for
Or instead of a nut driver, just a socket set with all the sizes.
The ur-lenovo
You keep grabbing the Dental Floss... I am gonna grab a beer. That's a heck of a complex design for a kb.
haha, well, I had a beer after I was done with the dental floss. Complex and a bit tricky to restore but that is a hell of a kb when it's restored and clean
@@Epictronics1 I can't wait to see! Cheers man.