Nice video. I got a new old stock cpu upgrade that you used. It has that bracket you used and also had a black square plastic spacer that sits around the 387sx socket. The 56/57/76/77 chassis all had rotating badges, just like the pc 330's. The 76/77 also had floor stands that clipped on the case.
5:53 - IBM PS/2 was a large construction kit. The same base chassis had been used for an ISA Model (8540) as well as for the 9577's and - IIRC - an entry level RS-6000 of which I cannot recall the model number, cause we did sell and support PS/2 only. A rare find were an IBM PS/2 Ultimedia M57. I have a 9577 with the Ultimedia stuff. Used it in the early 90's along with the ACPA/A to convert analog records to MP3 ...
I love the build quality of this case, my Model 77 486 DX2 shares the same case and 2.88 floppy drive. The performance is top notch along with the price back in the day.
33:20 Ask around for the grey "vertical stand" for these 5-slot cases. I wonder if I still have one in stock. But I may have a blank or CD-ROM bezel. Leave me a note and I work my way through the boxes in the basement ... 🙂 You'd put yours in the false way. The vertical stand mounts at the side adjacent the PSU. Power button is in hand reach from a desk then.
That would be nice to see it with a stand and a cd-rom eventually. Maybe even search for ultimedia parts in the future? Hope you do have them for @epictronics1 though
@@Epictronics1 A couple things: in the above sentence the word you want is since instead of sins. At 2:30 I believe the expression you are looking for is "It never really took off." not "on". Just a few things to be aware of. **Edit** You probably mixed up the expression "It never really took off" with "It never really caught on". In regards to the 2.88 MB drive, I don't really remember them being a thing. Since they are backwards compatible, I wonder why they didn't take off either. Maybe it was a cost thing?
@@pedrocx486 I wasn't trying to be annoying, I was trying to be helpful. I'd want someone to correct me in the same situation if I was speaking in a second language.
That was very satisfying! I was worried about those bent metal tabs being work hardened and cracking during straightening but it seems the IBM gods were smiling on you that day.😊
About the double sided ram not being correctly recognized- it might be the case of the bios upgrade. I remember once we visited the bank branch where they used Compaq’s desktops. After running over with bios upgrade disk, each of the PCs started to report twice as ram as before. It had appeared they were fitted with double sided sticks which started to be recognizable.
I had an IBM PS1, new in the 90's....until me and the neighbor overclocked it and fried it. Haha. Parents. Not. Happy. Lol Did run faster for a bit though lol.
The IBM 386SLC has 8Kb of L1 cache and runs all Intel 486SX instructions. The 486SLC2 has 16Kb of L1 cache, as you noted. When the 486SLC2 daughtercard is on the 8556/8557, it is run from the 20MHz base clock (meaning 40MHz internally); When used on a 9556/9557 system, the base clock is 25MHz. Someday I plan to test all of the Model 56 and Model 57 systems as a comparison...
@@Epictronics1: The 486SLC2 daughtercards should be able to do 50MHz (although the 486SLC3 being able to do 75MHz is more evident) - I'll need to do a summary comment.
I have an IBM Model 40SX that seemingly uses the same case! I really like that machine, because it has ISA slots :D Unfortunately, the soft-power-on power supply has died, and I need to repair it. Already recapped it, but that did nothing (kinda expected that). I suspect the power good circuit is bad. Don't leave this plugged into power! Edit: Just got to the part where you remove the power supply and mention it is not standard AT. That is true, physically. Actually, the pinout I have found indicates that an early ATX PSU would be perfectly suited to being rewired for this PS/2 power delivery style. But then trying to fit an early ATX power supply into the existing PSU chassis is not easy!
Yeah, you're much better off repairing the PSU than replacing it. Even if it turns out to be difficult. I will make a repair attempt on my Model 70 PSU (no power good). Hopefully in one of the videos in December.
27:25 Many pre 486 motherboards struggle with suport for non standard RAM size like 2, 8, 32 MB. Sometimes RAM IC have non symetrical RAS/CAS adress lines, what is causing most of the problems with compatibility.
Muito bacana esse computador da IBM. Dá para ver como eram bem construidos e usavam materiais de primeira linha. Eram caros também, mas é o valor que se paga pela qualidade. Parabéns pelo video, sucesso ao canal. Abraços do Brasil.
The 386 with L1 cache is unique enough that I wouldn't upgrade it. It's the only 386 model that has any on-die cache. I have only read about it, never seen even a video before yours! This is really cool.
Intel also made special 386 for laptops called 386SL which had integrated L1 (edit: after reading Intel datasheet, it only has integrated cache controller it seems), ISA bus controller and power management among other things. Compaq LTE Lite laptops used it, for example.
anybody else here have the strong suspicion that bending back the awfully bent pins with a mechanical pencil might have worked? just to make clear, i love & admire epictronics! props to the man :-D
Nice job and nice PS/2 :-) But I have a question, how do you clean/wash those filthy power supplies? Thinking what should I do with my filthy AT power supply.
What kind of SCSI cable is needed for the external SCSI interface? I have a similar IBM (8556) that I would like to add an external CD-ROM drive to but I can't seem to confirm which drives are compatible.
I have not looked into this yet. I have an external SCSI drive that I plan to restore an try out with some PS/2s in a future video. I'll do some reading (and probably get or build an adapter)
Some e-waste facilities had flooding or have rodents/rats. I use Lysol disinfection wipes from unknown sources (you’d be surprised what ends up on those wipes).
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Even I cringed when you brought out the dremel wheel! Very interesting machine and interposer!
You're right, the Dremel is more suitable for rare power supplies ;)
Pretty soon you'll have enough classic IBM's for a museum! Love it.
Hey now! 😉
@@IBM_Museum 😁
Nice video. I got a new old stock cpu upgrade that you used. It has that bracket you used and also had a black square plastic spacer that sits around the 387sx socket. The 56/57/76/77 chassis all had rotating badges, just like the pc 330's. The 76/77 also had floor stands that clipped on the case.
I'd love to find one of those stands, they look cool
13:56 Very satisfyingly rhythmic supercut of the desoldering gun! As a musician, I approve 😎
5:53 - IBM PS/2 was a large construction kit. The same base chassis had been used for an ISA Model (8540) as well as for the 9577's and - IIRC - an entry level RS-6000 of which I cannot recall the model number, cause we did sell and support PS/2 only. A rare find were an IBM PS/2 Ultimedia M57. I have a 9577 with the Ultimedia stuff. Used it in the early 90's along with the ACPA/A to convert analog records to MP3 ...
I love the build quality of this case, my Model 77 486 DX2 shares the same case and 2.88 floppy drive. The performance is top notch along with the price back in the day.
Excellent work restoring that interposer, and this classic lesser-known IBM system.
Thanks!
Really nicely done repair and restoration. Looking forward to your remaining repairs/updated/uprades. Thank you for all your work
Thanks!
33:20 Ask around for the grey "vertical stand" for these 5-slot cases. I wonder if I still have one in stock. But I may have a blank or CD-ROM bezel. Leave me a note and I work my way through the boxes in the basement ... 🙂 You'd put yours in the false way. The vertical stand mounts at the side adjacent the PSU. Power button is in hand reach from a desk then.
I'd love to find one of those vertical stands. They look great
That would be nice to see it with a stand and a cd-rom eventually. Maybe even search for ultimedia parts in the future? Hope you do have them for @epictronics1 though
Fantastic! What a great repair there. My Model 70 386 has an interposer upgrade too. Pretty rare upgrade!
Thanks! Cool, is it some sort of SLC board too?
@@Epictronics1 I think it is actually an Intel CPU, 486DX 33MHz . It's a Kingston 486/Now!
@@RetroTechChris Sweet. I need to find one of those too :)
I'm actually surprised the 2.88 drive never caught on. I wanted one. So did everyone I know, but you couldn't find them.
It is strange indeed. Especially sins they were backward compatible with regular 1.44
@@Epictronics1 A couple things: in the above sentence the word you want is since instead of sins. At 2:30 I believe the expression you are looking for is "It never really took off." not "on". Just a few things to be aware of.
**Edit** You probably mixed up the expression "It never really took off" with "It never really caught on".
In regards to the 2.88 MB drive, I don't really remember them being a thing. Since they are backwards compatible, I wonder why they didn't take off either. Maybe it was a cost thing?
@@LotoTheHero do you really need to come here just to be annoying about grammar?
@@pedrocx486 I wasn't trying to be annoying, I was trying to be helpful. I'd want someone to correct me in the same situation if I was speaking in a second language.
@@LotoTheHero Thanks, I appreciate the help in spotting my mistakes. I'll try to remember
That was very satisfying! I was worried about those bent metal tabs being work hardened and cracking during straightening but it seems the IBM gods were smiling on you that day.😊
There might have been some luck involved :)
This was an amazing video.
Loved the chat interaction- the moos were extra fun, and this channel just has an awesome community.
Thanks! I agree, the chat is fun :)
That's really awesome that you were able to save that interposer! :D
Great repair! I was so glad the interposer could be saved!
Thanks!
Hi Epictronics, Great job again and nice to see you work on a IBM. Greetings from Steven from the Netherlands
Thanks :)
Now I wait 30 minutes, fooled again to click. Must wait to see which interposer you have this time.
I need to give everyone time to grab some coffee before the premiere :)
Interposers must make poor hammers, all those wood chips.
@@drewnewby That explains it! ;)
About the double sided ram not being correctly recognized- it might be the case of the bios upgrade. I remember once we visited the bank branch where they used Compaq’s desktops. After running over with bios upgrade disk, each of the PCs started to report twice as ram as before. It had appeared they were fitted with double sided sticks which started to be recognizable.
I had an IBM PS1, new in the 90's....until me and the neighbor overclocked it and fried it. Haha. Parents. Not. Happy. Lol Did run faster for a bit though lol.
Oh, you might want to check out my IBM PS/1 videos. I have overclocked my PS/1 from 10 FPS to almost 40! That slow IBM is a real DOOM killer!
The IBM 386SLC has 8Kb of L1 cache and runs all Intel 486SX instructions. The 486SLC2 has 16Kb of L1 cache, as you noted. When the 486SLC2 daughtercard is on the 8556/8557, it is run from the 20MHz base clock (meaning 40MHz internally); When used on a 9556/9557 system, the base clock is 25MHz.
Someday I plan to test all of the Model 56 and Model 57 systems as a comparison...
There's the link from the 'Ardent-Tool' as well...
Thanks David. Do you know if all SLC2s are good for 50MHz? Or even faster?
@@Epictronics1: The 486SLC2 daughtercards should be able to do 50MHz (although the 486SLC3 being able to do 75MHz is more evident) - I'll need to do a summary comment.
Really nice and clean job on that array of pins on the interposer!
Beautiful IBM hardware again.
funny thing is, varta made really good acid lead batteries, i daily use one that is like 15/16yo at this point, works like a charm
I have an IBM Model 40SX that seemingly uses the same case! I really like that machine, because it has ISA slots :D
Unfortunately, the soft-power-on power supply has died, and I need to repair it. Already recapped it, but that did nothing (kinda expected that). I suspect the power good circuit is bad. Don't leave this plugged into power!
Edit:
Just got to the part where you remove the power supply and mention it is not standard AT. That is true, physically. Actually, the pinout I have found indicates that an early ATX PSU would be perfectly suited to being rewired for this PS/2 power delivery style. But then trying to fit an early ATX power supply into the existing PSU chassis is not easy!
Yeah, you're much better off repairing the PSU than replacing it. Even if it turns out to be difficult. I will make a repair attempt on my Model 70 PSU (no power good). Hopefully in one of the videos in December.
27:25 Many pre 486 motherboards struggle with suport for non standard RAM size like 2, 8, 32 MB. Sometimes RAM IC have non symetrical RAS/CAS adress lines, what is causing most of the problems with compatibility.
Muito bacana esse computador da IBM. Dá para ver como eram bem construidos e usavam materiais de primeira linha. Eram caros também, mas é o valor que se paga pela qualidade. Parabéns pelo video, sucesso ao canal. Abraços do Brasil.
Thanks!
I use OPL3LPT on my microchannel machines for sound I have it on My P70 Including an external Backpack Cdrom. I also upgraded the CPU in My P70
I wonder if the bracket is either for support/stability or to make some pointy haired boss think they were getting value for money?
Nice work.
Thank you
The 386 with L1 cache is unique enough that I wouldn't upgrade it. It's the only 386 model that has any on-die cache. I have only read about it, never seen even a video before yours! This is really cool.
Yes, I think we got roughly half the FPS when we ran benchmarks on the IBM with a regular 386 compared to this SLC. These are both pretty cool "386"s!
Intel also made special 386 for laptops called 386SL which had integrated L1 (edit: after reading Intel datasheet, it only has integrated cache controller it seems), ISA bus controller and power management among other things. Compaq LTE Lite laptops used it, for example.
I.B.Mgineering in that thick casting.
Epic video, subscribed!
Thanks :)
That's cool!
anybody else here have the strong suspicion that bending back the awfully bent pins with a mechanical pencil might have worked?
just to make clear, i love & admire epictronics! props to the man :-D
Unfortunately, some of the pins were missing. Otherwise, I would have tried.
@Epictronics1 oh okay, i didn't look closely, i was actually surprised how many pins were still there :-D
@@autingo6583 Yeah, that socket had seen better days :)
Maby the heavy bracket thingy is to get decent center of gravity for stability reasons when used in tower position?
Nice job and nice PS/2 :-) But I have a question, how do you clean/wash those filthy power supplies? Thinking what should I do with my filthy AT power supply.
Did you remember to rotate the badge back for desktop mode?
No, I need to go back and fix it :)
You're too brave putting a *VARTA* branded battery in there! 😨
Maybe, I should replace it 😅
We must never forget the horrors they have wrought on retro PCs. I curse towards the sky, Vartaaa!
Lithium batteries should be fine unless you're throwing them in a fire. It's mostly the NiCd batteries that leak and destroy old boards.
I'm surprised you didn't grab the re-work station sooner. lol
Gotta try every method ;)
@@Epictronics1 I'm watching you struggle and I'm like....at least use flux, but you should really pre-heat it.
I was also thinking you need a sweeper tip for your iron. It's nice and wide you'd be able to reflow the whole socket in 10 seconds or less. lol
@@awilliams1701 What tip would that be?
@@Epictronics1 I've seen them called sweeper tips. I've also seen spade tip and scraper tip.
Nothing about upgrading the VRAM?... 😁
I'll order some ZIPs and try them out in a follow-up vid :)
You should paint that power button red. 🙂
What kind of SCSI cable is needed for the external SCSI interface? I have a similar IBM (8556) that I would like to add an external CD-ROM drive to but I can't seem to confirm which drives are compatible.
I have not looked into this yet. I have an external SCSI drive that I plan to restore an try out with some PS/2s in a future video. I'll do some reading (and probably get or build an adapter)
I'm surprised you didn't use a 7mm mechanical pencil and straighten up those legs
Some pins were broken off already.
Cool
The play station 2 has the same kind of rotating logo
That battery pack says *...since 1887* not "...since 1987" 🤦♂
IBM Station 2 😁
I love this rare and odd hardware! SLC and DLC Chips for the win.
You could just solder some pins from a defective cpu. no need to remove it.
I don't think I have any scrap CPUs. I have however repaired a 486 ones with a broken of pin by soldering it to the CPU. It totally worked
Friendly advice for your English skills: Feet is already the plural word for foot so you should not add s to it to make it plural.
🐮🐮🐮🐮🐮🐮🐮
Why are you so obsessed with the sometimes unnecessary deep cleaning of hardware? This didn’t look like smokers pc.
Some e-waste facilities had flooding or have rodents/rats.
I use Lysol disinfection wipes from unknown sources (you’d be surprised what ends up on those wipes).
Clean computers are more enjoyable