athlon-power wrote:

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My IBM PS/1 486dx-50 originally came with a Sound Blaster 16 sound card
4mb or ram upgradeable to 64mb ( 4 x 16mb ). Possibly upgradeable to 128mb ( 4 x 32mb ) Fast Page Mode RAM. Non-parity, 72-pin.
and a 540mb hard-drive.

I have an Onboard Cirrus Logic 5428 graphics chip which is pretty good for it's time.
Only the Cirrus Logic 5429 was a little better but not much.
So No need to add a VLB Video card if you have the 5426 or 5428.

For Windows 3x / DOS, 16mb of ram is good enough.
For Windows 95 32mb of ram should be good enough.

I upgraded my CPU with and Intel 486dx4-100 Overdrive CPU.
But 66mhz is good enough for DOS/Win3x

Intel486dx33 wrote:

My IBM PS/1 486dx-50 originally came with a Sound Blaster 16 sound card 4mb or ram upgradeable to 64mb ( 4 x 16mb ). Possibly up […]
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My IBM PS/1 486dx-50 originally came with a Sound Blaster 16 sound card
4mb or ram upgradeable to 64mb ( 4 x 16mb ). Possibly upgradeable to 128mb ( 4 x 32mb ) Fast Page Mode RAM. Non-parity, 72-pin.
and a 540mb hard-drive.

I have an Onboard Cirrus Logic 5428 graphics chip which is pretty good for it's time.
Only the Cirrus Logic 5429 was a little better but not much.
So No need to add a VLB Video card if you have the 5426 or 5428.

For Windows 3x / DOS, 16mb of ram is good enough.
For Windows 95 32mb of ram should be good enough.

I upgraded my CPU with and Intel 486dx4-100 Overdrive CPU.
But 66mhz is good enough for DOS/Win3x

Mine has a Cirrus Logic 5430, essentially the same as a 5429 from what I can gather, so I'm lucky that I dot a decent deal as far as integrated graphics are considered. Mine had no sound card, but came with a Future Domain ISA SCSI controller and an ISA 3Com EtherLink III card, though the card itself seems to be aftermarket as it has no IBM part numbers.

I am considering getting a different case for the system. If I do, I will likely upgrade it to a DX4-100, or an AM5x86 P-75 (133MHz). I probably won't go for the 5x86, but that has yet to be seen. If I keep it in its original case, and repair it over time, I will not change the CPU as the front label lists it as a DX2-66 and mismatches like that irk me slightly.

Yeah, That VLB slot is pretty much useless since they put such a good graphics chip in these computers. I was looking for an IBM desktop with a VLB slot but after researching it
they are NOT needed. All you can use them for is a controller card or video card.

My IBM PS/1's are all ISA which is fine since all I needed to add was a sound card and network card. The onboard video is good enough.

Intel486dx33 wrote:

Yeah, That VLB slot is pretty much useless since they put such a good graphics chip in these computers. I was looking for an IBM desktop with a VLB slot but after researching it
they are NOT needed. All you can use them for is a controller card or video card.

My IBM PS/1's are all ISA which is fine since all I needed to add was a sound card and network card. The onboard video is good enough.

My question is why did IBM put such good graphics chipsets in these things? It's not like these were high-end machines by any degree, and if you look, both the model in your IBM PS/1 and the model in my PC 350 is better than even the TSENG ET4000 (screenshot took from a PhilsComputerLab video I found when initially trying to gauge the performance of my PC). This isn't even in just what SVGA resolutions/colors it can do, but in raw performance in things such as games.

This isn't to mention that I'm not using a DX-33, I'm using a DX2-66, which inflates performance even more than reflected on these charts. Keep in mind that this computer, with this powerful of a graphics chip, is the same computer that an automotive shop bought and abused slowly via chemical dust suffocation while they ran weird automotive certification exams or whatever on it. It didn't have any cache though, so they would've never been able to remotely experience this PC's actual performance potential.

I bet it can run Quake.

https://groups.google.com/forum/#!topic/rec.g … isc/A8pTldeVGqA "Got a 486? TOO BAD, cant run quake."

https://groups.google.com/forum/#!topic/rec.g … mer/gAu8a3RZVVo "Secret why Pentium beats K6 on Quake"

Here are a couple of old threads I found a while back when doing too much research into mid-90's computer stuff, which I ended up remembering while writing this. One thing that I found a lot were old threads like these, which was my roundabout way of trying to figure out more about the "not on paper," stuff that Wikipedia and other similar things didn't cover, but that people talked about at the time. The "Secret why Pentium beats K6 on Quake" is far more entertaining than the first one, particularly on the 6th and 9th posts.

Flame wars regarding AMD and Intel written decades ago aside, I will be trying this and seeing what happens, in my own experience. Wish me luck.

For Dos/Win3.1 even without L2 that ststem would have been totally adequate for what it was used for. Looks like it is a member of the PS/ValuePoint range which basicly ran parrallel to the later PS/1 systems. Because so many were produced having vlb on the mobo makes sense and would have kept costs down Same goes with having integrated i/o. DEC, as well as other OEMs did as well. Most likely the HDD controller is vlb as well. Some model ValuePoints have on board PCI. This might be handy https://www.manualslib.com/manual/841230/Ibm- … 472.html#manual

Full discloser I run Windows 3.1 on a 286/12 system with 8megs of ram.

At least IBM saw the light and realized MCA was a dead end with all its propriotryness of its interface and peripherals. Same goes for the first two models of the PS/1 range which had wierd ram upgrades, speaker along with psu in the Monitor and odd connections for HDD and FDD. The 4-Quad menu was pretty cool though and like it being in rom and dos was also in rom. You can get and updated version of the which can load off the HDD for Dos 5 & 6 systems.

Here's a few updated pictures now that I've got it set up:

Here are the current specs:
IBM Personal Computer 350-466DX2 (Type 6581L5F, BIOS date 03/10/95, Motherboard OAEK8XJLU7I)

486 DX2 66MHz (It could be an Intel, an AMD, a Cyrix, or even an OEM IBM chip, I have no clue. The CPU has a heatsink glued onto it and the BIOS only says "80486DX2 66MHz.")
12MB 72-pin SIMM (1x 4MB, 1x 8MB)
Cirrus Logic 5430 VLB 1MB
540MB IDE HDD (No speed, I'll assume this is either a ATA-33 or slower drive)
Onboard IDE Controller (No given speed, same assumption as with HDD)
50-pin SCSI 4x CD-ROM
Future Domain 1680 ISA SCSI Controller
ESS AudioDrive 1869F
3.5" 1.44MB FDD

It uses PwrSCSI! Software which handily sets up the DOS CD drivers for me. I was using a 48x IDE CD-ROM drive before, but I recently got an external 4x SCSI CD-ROM, so I took it out of the enclosure, and threw it into the computer. So far, it's been working fine, knock on wood. The floppy diskette you see sitting to the left of the monitor is a DOS 6.22 boot diskette that I made to be able to play Wolfenstein 3D. Wolf3D doesn't like the SCSI drivers being loaded, and will say it doesn't have enough memory, so I made a boot diskette, copied the autoexec.bat and config.sys files over from my C: drive, and just removed all of the entries for the SCSI software, and the game launches fine. I'll probably use this diskette for any other software that doesn't run right with the SCSI drivers initialized. Both DOOM and Heretic run just fine with the SCSI drivers loaded, so this is more Wolf3D specific.

I still may try to get some 2fps gameplay out of Quake on this machine. I did, however, recently get ahold of a Pentium MMX 200MHz machine for US$5, which included the Packard Bell monitor I'm using for the 486 right now. It originally had the speakers on there, but seeing as I don't have a power supply for them at the moment, I took them off and put them into storage until I can get a power brick for them. I may end up saving Quake for that machine, if I can get it working right, that is.

If you have access to a 3D printer and an expert modeler, You might be able print a out a piece to fit that broken case. Or use some clay to help mold a replacement part.
Then just epoxy it on and paint.
Should be good as new,

If you can get access to the motherboard manual.
You should be able to fit a 486-dx4-100 overdrive CPU which supports 5 volts.
Just set the jumpers to 33mhz bus which it probably all ready is so you just need to pop in the DX4 overdrive CPU

3 x 33.3mhz = 100mhz.

https://www.ebay.com/itm/NEW-SEALED-VINTAGE-1 … awAAOSwHSVcbzPL