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Worklog of a Vintage mod: IBM PS/1 2125-Rog

Joined
Jun 7, 2015
Messages
38 (0.01/day)
Location
France
System Name HAL (modded, 1.3U "pizza box")
Processor Intel Core i7 4790K @4.6GHz
Motherboard Asus ROG Maximus Impact VI
Cooling Custom (flexible) loop: Alphacool NexXxoS XP³ Light / EK SBAY DDC 3.2 PWM / 2x Magicool G2 240 rads
Memory 2x8Go DDR3 2400 - G-Skill Trident X
Video Card(s) EVGA Geforce GTX 1080 Hydro Copper
Storage Crucial M500 M.2 480GB + Samsung QVO 860 1TB SATA
Display(s) HP Omen 35" 3440x1440 GSync 100Hz
Case Modded iSTAR USA D-107V2, 1,3U rack case
Audio Device(s) none
Power Supply Corsair SF600 (SFX)
Mouse Corsair Vengeance M65
Keyboard Cooler Master Quick Fire pro
Benchmark Scores 3D Mark Time Spy: 7361 ( https://www.3dmark.com/spy/5334187 )
Hi everyone.


I have had a few attempts at making my own cases in acrylic for some time but there was nothing worth sharing. Lately however I got the idea of modding one of the dinosaurs buried in my basement, as I was thinking about building a more compact case than the Lian-Li PC 27 I used.


It is still done with (very) limited skills, tools, budget and time, mostly using spare parts and materials.


Above all it is a tribute to my first ever PC, an IBM PS/1 model 2011, first model of the PS/1 series, which was launched exactly 25 years ago in June 1990.


So let me introduce to you the project:


IBM PS/1 2125-RoG


The host case:



27cm (length) x 35cm (depth) x11cm (height), I don’t have the monitor.


I did not use my original PS/1 Model 2011 (a 286@10MHz, with 1MB RAM and 30MB HDD) as it is in working condition and at the time it felt really too small. I thus used an IBM PS/1 Model 2121 of 1992, originally a 386sx16, which is basically as big as two 2011 stacked. Since then I found a second spare 2011 case and started thinking about a new project.


The nice thing about early PS/1 cases is the way they slide open: front/top/sides upper cover slides on the bottom/back plate, leaving all the internals easily accessible. There are no screws, just a single button on top, locking the upper cover in place.


Objectives:


Give a more modern look to the case while…


… Preserving the original shape a maximum, especially the way it slides open

… Fitting-in the following gears:

  • Intel i5 4670k cooled with a Antec Kühler 620
  • Asus ROG Impact VI with 2x8GB of G.Skill DDR3-2400 Trident X
  • EVGA Geforce GTX 770 SC 2GB cooled with a Corsair H55 mounted with a Kraken G10
  • Crucial MX500 M.2 500GB SSD & WD Caviar Blue 1TB 3.5’’ HDD

… Getting decent cooling by keeping the two closed-circuit loops.

… Avoiding the use of a PCI-E riser (no space for a rigid one and I never managed to get a decent flexible one)… this meant adding a minimum of 2cm to the original height…


A glance at the final result:



Step 1 : the bottom plate/motherboard tray and the back-plate


I had a first try at making a whole new bottom plate in acrylic, but the end result was bulky and the sliding/locking was not as good as the original.


I thus chose a lighter design, cutting the bottom plate just where it was needed to fit the mother-board and graphic card, and getting the additional 2cm required by using a spare 4mm acrylic sheet and 2cm L-shaped aluminium rails.


The original bottom plate, cut:




Work done on the new motherboard tray:









This design improved the cooling system I thought about (by providing more clearance under the case): stacking the two radiators and two Be Quiet 120mm fans, with air taken from underneath the case, exhausted on top.


On the left side rail I drilled a holes to fit USB and audio ports taken from a Bitfenix case and also a rectangular hole to exhaust a bit of the GPU's RAM/VRM warm air. In addition I cut a round hole on the tiny front rail to host on/off button from a Lian-li case.





I used the same spare acrylic for the back-plate, painted in the same flashy red as the MB tray for the inside and covered with a fake carbon fibre sticker for the outside.


Work done on the backplate:










The final look of the bottom/back plate:







Step 2: work on the cover


A simple paint job on the front plate:




Some trials and errors on the upper part of the case, gladly invisible now.

Initially I had thought to cut a hole for a 120mm fan grill, but the end result was quite uggly.








I then found 16.5cm speaker cover from a VW Gold 4, which used as a fan grill would have the advantage to hide my deplorable lack of skill at drilling/cutting.








Work on the case was completed but I was still a bit worried about how everything would fit in there.


Step 3: Fitting everything in.


Cable management was as expected a real issue :)


Here is a look at the inside, with all parts and wires in, except for the SFX PSU which comes above the CPU.





Here is a side view when closed.





A view at the not too great back plate :sigh:





And finally a look at the working PC.





The background pic is the original welcome screen of the PS/1, a simple shell for PC-DOS 4.01. I also installed another classic piece of IBM memorabilia for the picture: an IBM RT3200 including a trackpoint, ThinkPad style.


The whole thing has a Thinkpad/Intellistation feel actually.


What’s next?

  • I realized I forgot to put a HDD LED, I will install it on the A: LED space on the front.
  • I may make a better back plate.
  • Think about a custom water cooling.
  • I have the project of putting the same gears in the original PS/1 2011 case (half the heigth of this one) with a custom WC with pump/tank/rad in a small tower outside.





List of the gears used in this built:

  • Intel i5 4670k@4200Mhz, cooled by an Antec Kühler 620
  • Asus ROG Impact VI motherboard
  • 2x8GB DDR3-2400 G-Skill Trident X
  • EVGA Geforce GTX 770 SC 2GB cooled with a Corsair H55 mounted with a Kraken G10, mildly overclocked to 1161/1213MHz for GPU and 1788MHz for memory.
  • SilverStone SX600-G SFX 600W PSU
  • Crucial MX500 M.2 500GB SSD & WD Caviar Blue 1TB 3.5’’ HDD
  • Lian-Li PT-SK03B kit for the power button
  • 2x be quiet! Shadow Wings PWM 120 mm Fans
  • 1x Noctua NF-A6X25 FLX fan for the front air intake (through the floppy drive hole). I am thankful to Noctua for coming with this rather unusual form factor
  • BitFenix USB 3.0 Upgrade Kit for Outlaw and Shinobi for USD 3/USB2/Audio front ports
  • A 120mm Silverstone magnetic fan filter, stuck underneath the case.
  • A blue led to replace the original orange one.
 
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