Hmmm that is the oddest method of adding a VRM to board I ever saw. Will check around for some info. An Intel DX4ODPR100 should drop in with current DX2 settings....

Mhmm. I bet a lot of us now have the same machine, thanks to a certain person dumping a literal pallet of them on EBay for $100 each. I bought one of those, but no, I don't have any documentation for it. I'm not expecting it to turn up either, I'm guessing it was something that only Unisys and IT departments would have had as Unisys was oriented toward large business needs.

For what its worth, mine is currently down for the count because the power supply failed. As you've probably discovered by now it has a rare setup with a third P10 connector that supplies 3.3V.

On another note, am I missing something, or do I need a proprietary Unisys bracket to mount a CD-ROM drive properly?

you are right, i got it of Ebay recently form the guy who sold a whole pallet of them for $100 each...
My system works fine for now, pre installed with Win95. Looks like mine came from the prosecutors office in Monmouth county.

I saw the additional connector from the PSU, but was not aware it supplies 3.3v. The DX2 i am running right now is a 5V chip, and i have a AM5x86-133 which is a 3.3V chip. I suppose there must be a jumper somewhere to set the CPU voltage to 3.3V, since it is supplied from the PSU.

Also, there are several threads about the Tulip TC-40 mainboard on Vogons. Some persons posted links to the manual, but all of them are broken at this moment.
The same board was used in Tulip computers in the Netherlands and others.

Re: AT Power Supply Cable Color Codes
Re: 486 asus motherboard with no slots
Re: Dutch members: Tulip Vision Line dt 4/66 (486) CPU jumper help?

I was wondering the same, but i am certain you need a special carriage to add the 5 1/4 drive bay. Probably i am building something by my self.

peda126 wrote on 2020-09-23, 01:12:

you are right, i got it of Ebay recently form the guy who sold a whole pallet of them for $100 each... My system works fine for […]
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you are right, i got it of Ebay recently form the guy who sold a whole pallet of them for $100 each...
My system works fine for now, pre installed with Win95. Looks like mine came from the prosecutors office in Monmouth county.

I saw the additional connector from the PSU, but was not aware it supplies 3.3v. The DX2 i am running right now is a 5V chip, and i have a AM5x86-133 which is a 3.3V chip. I suppose there must be a jumper somewhere to set the CPU voltage to 3.3V, since it is supplied from the PSU.

Also, there are several threads about the Tulip TC-40 mainboard on Vogons. Some persons posted links to the manual, but all of them are broken at this moment.
The same board was used in Tulip computers in the Netherlands and others.

Re: AT Power Supply Cable Color Codes
Re: 486 asus motherboard with no slots
Re: Dutch members: Tulip Vision Line dt 4/66 (486) CPU jumper help?

I was wondering the same, but i am certain you need a special carriage to add the 5 1/4 drive bay. Probably i am building something by my self.

Wayback to the rescue! 😀

https://web.archive.org/web/20180107113509/ht … oard_manual.pdf

PC Hoarder Patrol wrote on 2020-09-23, 01:37:

Wayback to the rescue! 😀

https://web.archive.org/web/20180107113509/ht … oard_manual.pdf

Great find ! Think better images of the motherboard could be helpful. Never seen a V. reg planted in a surface mount 486 cpu area before.

Does your floppy interface work, with standard twisted pair cable and standard floppy, my same TULIP mini motherboard has an issue, that it will see both A and B drive, but only B drive is readable, even if only B drive exist. A drive reading gives you immediate error. I allways suspected, that maybe it is some kind of pinout issue. I use it driveless, with a swappable hard drives.

Does this manual match your board's settings too ?
http://www.win3x.org/uh19/motherboard/show/5620

Yes, i have the same board.

Thanks to the posted link to the manual, got the system up an running with a Am5x86-P75 133 CPU! Great idea with the Wayback machine!!

BUT, with all my screwing around yesterday, i dropped the CPU 90 degree off in to the socket. Unfortunately i heard a "sssstt" and saw a small spark and it looks like the onboard IDE controller is fried..... I order a loupe to inspect all SMD parts in the are where is saw the spark, maybe i can identify the fried part and replace it.

I could not get the system working with a ISA IDE controller.

@cyberdyne: my floppies are working fine. I have a 1.44MB and a Gotek connected. My cable has NO twist, which is weird. ( On my 386 system i use a cable with twist)

Eeks! That sucks, it's a nice PCI IDE controller too. I'm assuming you've gone and disabled the onboard drive controllers? On a related and hopefully not too sore note, could you ever get your machine to boot up with LBA enabled? Two ~500MB drives is a lot for a 486, but still.

@cyberdyne: mine also has no twist. There's two IDE-style connectors for the newer 3.5" drives, and one edge connector for the 5 1/4" B: drive if so equipped.

I disabled all onboard controllers, but i also did not spend to much time yet. I was kind of frustrated.....

Before i broke the IDE controller, i had two 500mb drives connected. The original HDD and a IDE-SD adapter and it worked fine. I had LBA enabled.

If anybody wants to sell his Tulip TC40 mainboard, i would buy it.

Mine has a cool TLDR for the jumpers inside, I let that here for the future people landing on this thread in the future.

I recently got one of these from that same guy. I feel like a real idiot, but I can't figure out how to get the case open. How do you do this? 🤣