If your PSU doesn't have Molex's then what connectors does it have?

Tetrium wrote:

If your PSU doesn't have Molex's then what connectors does it have?

NO KIDDING! These model IBMs have this proprietary board that has the power and data in these slots. They also don't have ISA, VLB, or PCI slots...but MCA slots (PCI's predecessor). It's all very weird but kinda cool.

Welcome to the difficulties of IBM PS/2. 🤣

You need a DBA drive, it will draw power from its custom connector. I've bought 5 DBA drives (3 in PS/2s) to find one, that is working. There's also a MCA SCSI controller with a molex connector if you want http://ps-2.kev009.com/ohlandl/SCSI/MCS.html#MCS-600_700 .

PeterLI wrote:

Welcome to the difficulties of IBM PS/2. 🤣

Looks like it's another IBM-incompatible IBM 🤣!

There has to be a solution. This thing came with a SCSI hard drive with a 50-pin connector. Goodwill jacked the drive and whatever adapter it came with. I appreciate your jokes but I really would also like a solution.

Thanks

Good luck! Ask around on Vintage Computer Forum and the IBM PS/2 newsgroup. 😎

Well... Opening the PSU and soldering a Molex power wire harvested from some dead ATX PSU is always an option.

I have a few of these hard drives sitting on my shelf. I have NOT tested them yet, but I think i might do so this weekend.

Good point!

I am pretty much at this bridge just now with a Model 80 upgrade / restore mod, luckily though... there are molex connectors with the 80.

Regards to your system, and if you are intent on using a standard SCSI drive with molex connection... a DIY mod sounds like the way to go. Can you solder?

If so it should be an easy mod to make... just locate the trunk PSU cable that goes to the motherboard. Open the PSU (not as daunting as it sounds) and find the source of the trunk cable. Patch (solder) a single cable coming from the 5v DC line, one from the 12v DC, and two from common (ground). Thread all 4 of them through into the chassis and attach a connector. This as someone suggested earlier would be easier if you just butcher a set of cables with a connector already on it from another PSU and thread it through from the chassis into the PSU.

Once you've done this, you can get splitters and have many 4-pin molex connections by using a splitter from the single one you've made.

All the best!

johnnynismo wrote:

There has to be a solution. This thing came with a SCSI hard drive with a 50-pin connector. Goodwill jacked the drive and whatever adapter it came with. I appreciate your jokes but I really would also like a solution.

Thanks

Yup, either solder a molex or (if possible) get an adapter, though I don't know if such adapters actually exist right now.

edit:
Using an adapter would imo be the preferred solution btw, would be more neat as one can swap dedicated adapters around at will instead of having to desolder it.

johnnynismo wrote:

There has to be a solution. This thing came with a SCSI hard drive with a 50-pin connector. Goodwill jacked the drive and whatever adapter it came with. I appreciate your jokes but I really would also like a solution.

Thanks

Look at my previous post. This is the adapter you are looking for.