XT motherboard hacked & hard drive repair. IBM 5155 & Miniscribe 3212 & reassembly after restoration
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- Опубликовано: 10 окт 2024
- IBM 5155 teardown here: • IBM 5155 teardown + po...
IBM 5160 Restoration here: • IBM XT 5160 Multiple f...
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Tools I regularly use
DeoxIT D5 Contact Cleaner
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
PCBs from PCBWay.com :)
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Music by Karl Casey @ White Bat Audio
IBM 5155 teardown here: ruclips.net/video/SeyIBnqcCak/видео.html
IBM 5160 Restoration here: ruclips.net/video/X15hLGrxD0s/видео.html
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@ 14:04 is it just me or was the LOWER R/W head stuck...It looked to me like something was bent when you moved the platters, and eventually it went PLING! when the head came off. Let's hope the platter's magnetic coating was not damaged... *continues watching*
@@amurtigress_mobile365 I rewatched that part and I think you're right. I have used the machine for a bit now and played some DOS games. It seems to have survived the trauma
I got two of these, if I don't sell them , this will me most useful for restoration.
Admire you again removing ic's from that board. I had to resolder one last year on my 5150 with a socket, my hand was shaking with fear of damaging the tracks 😊.The other Hercules 2 colour hi Res graphic card rings a bell, I had one working with windows 3.1 back in the day. I also did the same trick you did with the keyboard cable on an old Rotary dial phone.
Thanks. That Hercules card is actually on the bench right now. Maybe, we'll fix it this week
Repair of the video card sounds like fun.
I'll give it a go. The only thing I can do is to check if the logic is working. The rest is custom chips and a ROM with unknown content. But it's worth a try
@@Epictronics1 yeah
Wow great stuff, can't believe you are able to get those things back together...working on getting some 486 parts to build a dos machine with my son. Thanks for sharing!
Thank you
For future reference you should never move the heads on a hard drive while it's not spinning. Sometimes you get away with it, but it can cause platter damage. You may also have been able to get to the spindle flywheel to free it up without opening the cover just by removing the logic board
Yes, of course, Nobody should ever open up a hard drive at all. In this case, the lower head was stuck to the platter and the motor had seized. The choice we had was to either do what we never should do or throw away the drive.
At ruclips.net/video/F_AFgeEWewE/видео.html you can see the lower heads bending as the motor is turned, i'm amazed the heads survived.
@@Epictronics1 He is right though, on those (and almost all MFM drives) , the motor is exposed on the bottom of the drive under the logic board and you can just turn it there.
@@jameshearne891 Yes, I rewatched and noticed, lol. I'm still using the drive and it works like a charm
@@Epictronics1ive just bought a 5155 and basically doing the same, there was a ST-225 inside not working. Taking it apart the straps from the head to the motor had completely snaps. I guess the heads must of been banging a long time to cause this. I've put a ST-251 in it and its working now fine, also installed laplink portable for serial connection to my dosbox. There is also a memory Io card in it "microforce plb-85". Cant find any info on it.... Other than that it's fine, only the psu fan is screaming. has anyone experience in lubricating this particular fan, maybe could give me some tips. Thanks
When doing telephone cord restorations, i found boiling water with no rod at all, made them relax to their original shape
Happy caps again!! Everytime I see a happy face on the caps I smile! Haha. Great work!
Happy caps= happy IBM :) Thanks
At my first job, we had a $60,000 SGI Indigo. We used it for about 2 months when one day it through a hard drive failure error. SGI's tech support recommended removing the hard drive and drop it in an office chair... "That'll fix it!". They were serious and we did it and it actually fixed it. Apparently the heads would get stuck.. A known issue. For $60k.... You'd expect better lol!
lol
This reminds me of a hp printer the official hp forum posted the solution as unplug the printer and then up a bit and let it fall. For when get stuck. And worked.
I have to say I havent seen a lot of 5155s but that is the 1st one I have seen with a hdd, all the rest I have seen have the dual fdds.
Another great video.
Thank you
Great video. I was wondering the whole time what was wrong with the Hercules CGA card, curious to find out.
Thanks. yeah, I think I'll have a go at repairing it. It's a weird and interesting card to keep and use in this machine
While I've taken apart many hard drives, it was never to help them live on. Glad to see it was successful, at least in the short term.
Well, I'm making a backup of it now and installing a fresh copy of DOS. I'll let you know if it keeps working
I'm so glad you showed the heat gun trick. Surprisingly few people know about it. Now have you tried twisting the cable so the twist goes in the opposite direction? I find that tightens up cables really well too after you've tighened up the coil.
I wasn't aware of the "reversing the coil" hack before I got comments on this vid. I'll try it out in part 3. Thanks
Restored to museum quality!! Excellent work and video. Thanks for sharing
Thank you
Good tip when you open stepper motor drives.. Check for dust before you close the lit again.. If there is little dust, use compressed air can to remove, so the whole surface is clean again before closing the lit for good. Never use a hammer on stuck HDD.. Mostly they are stuck for a reason. Head can also stuck on the platter or close to it. Then you make more damage when using the hamer method.
Good advice
I would recommend running Spinrite on the hard drive.
I think I will. I have it on the bench now to do a clean install of DOS
Great work on the restoration. Quite a nice retro PC.
Thank you
That's really cool that you were able to get the hard drive working again. Hopefully you'll be able to get some use out of it for some time. It would definitely be cool if you are able to repair that original graphics card.
Thanks, I'll give it a try
That's a good tip about pre-heating the board before desoldering the caps. I've got a socket 370 board with bulging/leaking caps, and I destroyed a couple of traces while attempting to desolder the second cap, so put the project aside at that point. I'll give the pre-heating trick a try with the rest of the caps, hopefully that will prevent more damaged traces.
Be careful not to heat the board too much. If you heat the board long enough, some components will actually start falling out. Start with 30 seconds at half speed/heat. I will be recapping a Dual Socket 370 board on the channel, but that video is still weeks in the future, Good luck with the project
@@Epictronics1 Thanks for the tip!
Are you going to make a repair attempt on that Hercules card?
Yes
This is my favorite IBM machine, I enjoyed this restore. I did mine a while ago, try to find an ATI small wonder graphic solution it has the pin header and could do EGA on this CRT very fun upgrade
Thanks. I have since this video replaced the two VRAM chips on the original card and it now works too :)
Really nice machine! Always stressful to try manually spinning the platters, but it paid off!
yeah that pinging noise made me grit my teeth
yeah, I was lucky! Playing Tetris now, like it's 1984 : )
@@TheChipmunk2008 Me too actually, I was just playing cool on camera ;)
Nice work on the hard drive! You're braver than me. 😂
Thanks : )
I'm surprised IBM didn't omit the socket for the 74LS158 to save a few additional cents per unit... nice upgrade!
yeah, not sure what IBM were thinking. I guess they were prepared to quickly change to offer these with 640k, thanks
Man, I had figured the display was down to a dirty pot on the monitor controls or a voltage issue. Nicely done. Can't wait to see this guy overclocked and expanded! You thinking '286 card in there or something?
Dude, that would be so awesome. Unfortunately, I don't have an Orchid Tiny Turbo or similar. Hopefully, someone will reverse-engineer it. I'd be the first to order PCBs and build one up
Awesome job
Thank you
I thought these came out on saturdays. Nice getting it day early
Yes, trying something new. Thanks
Another awesome video!
Thank you
Nice work. I normally dont use a jumper for E2 but use a small cutoff leg from something (Tant cap usually) as it is very un likely anyone is going back to 256K ram. Nice work though you have a very nice portable now
Yeah, I don't expect anyone will ever go back to 256k but I thought a jumper looked neat and original. Thanks
CGA doesn't even look so bad on an amber screen :D
Very nice!
Thank you
Thanks for a great video
Thank you for the encouragement
Just wondering if you would be able to up the ram to 768 or 832 kB and use upper memory blocks.... That was possible with the P3105 (Philips Machine)
Yes, I think this board is hackable to more than 640k
Never do it, but sometimes it is helpful to get that last bit of life out of a drive. I wouldn't trust the drive to last much longer. That stuck head seems like bad news waiting to happen.
I'll do some tests later. Right now I'm too busy playing Tetris on this IBM : )
21:30 ithe next step should be to reverse the coil. f you reverse the coil it will get tighter. This is done in the manufacturing process.
I'm not sure I understand. What do you mean by reversing it?
@@Epictronics1 ruclips.net/user/shortsbn5wcgRu9-0?feature=share shows the technique in the second half of the short.
@@TonyLambregts oh, that makes perfect sense. I'll try that, thanks!
If you bought it from russia, there is a great chance that it was my computer!
It didnt have the same circle pads on a back of a keyboard.
If it has 640 kb of memory, which was very rare, and 20 Mb HDD then it was definetevly mine.
My favourite games there were “kings bounty”, “ranger”and “Chessmaster 3000”. I think i had nearly 20-30 different games there.
“Golden axe” was loading for 40(!!!) minutes and was going extremely slow.
I sold this computer in 1995. In 2005 i wanted to buy it back but the guy sold it to someone else((
Probably not :) This one only came with Tetris
at 14:30 when you Opened the Hard Drive you didn't clean the stepper motor full of dust inside.
Yeah, I noticed that dust too late. But the dust was sticky, I was lucky
That would probably increase the chance of dust landing on the platters.
🔥👍
need the pc sprint
What caps are used here?
The tantalum caps on the MOBO are 10uF 16v, cheers
And those other one's? I got one broken. It says like 47nM. In the schematics it is 47 pF. Are those important for a working board?
@@Zaffindo I don't have a board accessible right now to check. It's very likely that all the small caps have the same value. It's also very like to work without that cap until you have found a replacement
23:00 what's wrong with the music during assembly?
That's what you get on a budget
You get one second more of the loop for every Patron that signs up. haha
@@nickwallette6201 Haha, not too far from the truth! Patreon money is eventually going to buy assembly music for the channel
Nice. It is quite brave that you just use that hdd you opened previously... that thing will fail in no time.
Actually some sudden moves counterclockwise should make the same result without opening... but that is well known that not a permanent fix. This will not be one either, that hdd will fail. Save your data! :)
I better save that copy of Tetris right away ;)
yep. Giving it a firm rotation and a sudden stop is usually enough momentum to get it to overcome the sticktion.
Why did you have to blur the screen? I don’t think people will care if you show their name 40 years later if they’re even still alive they’d probably be pretty happy to see that they’re hard drive is still alive.😂. I don’t think there’s gonna be any life or death confidential information on this drive lol.
You're probably right
you are aware of the 1 MB mod for the XT board?
What do you mean? Who would ever need more than 640k in a computer?
Silly jokes aside, I can't find the file to program the U44 GAL chip