VOGONS

Custom Seasonic Modular Peripheral Cable

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First post, by DayDreamer

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Planning a Retro-PC build for booting FreeDOS (I'm not really a gamer, not worried about being able to run Win 3.x or Win anything, just miss the DOS programs of my youth) on bare metal.

Power supply I already have is a Seasonic Focus GX-550, bought it several years ago for another project and didn't use it.

That PSU comes with ONE peripheral cable (RB57) to supply power to up to three LP4 (4-pin Molex) powered devices. It does not however come with a peripheral cable for any SP4 (4-pin Berg) powered devices, and I'll need three (two floppy drives and a CF to PATA/IDE adapter).

I could buy another RB57 cable online and use LP4 to SP4 adapter cables but it looks to me like the Seasonic six-pin peripheral plug is a Molex ‘Mini-Fit Sigma PN 1727081006’ using a crimp inside the housing that appears to be part number ‘1727183121’.

Is that accurate? Does anyone here happen to know?

What I'm thinking of doing is making my own modular peripheral cable to support three SP4 powered devices. In fact my custom peripheral cable probably wouldn't even need the +12V from the PSU, just the +5V and the two grounds (well just one of the grounds but both won't hurt nothing).

Thanks for comments.

Reply 1 of 3, by DaveDDS

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Do you have a multimeter? Easy enough to test the voltages at the connector.

If you don't need all the Molex .. it's simple to make a converted. I've used the molex connectors
from dead drives to make such adapters*. I'd include the +12v rail - you might not need it now, but
much easier to add the extra wire now that sometime down the road when you want to put in a
drive needing the +12.

*I've even made pins from various thicker copper wire to connect to them (but much harder to
keep organized if you want to disconnect a lot - if you go this route I might stick with only two
wires (+5 and Gnd)

Dave ::: https://dunfield.themindfactory.com ::: "Daves Old Computers"->Personal

Dave ::: https://dunfield.themindfactory.com ::: "Daves Old Computers"->Personal

Reply 2 of 3, by DayDreamer

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Yes I have a multimeter, etc. and of course would use a multimeter to make sure it is wired correctly, I just am trying to figure out if:

Molex ‘Mini-Fit Sigma PN 1727081006’

is the correct six-position connector for the PSU side of the peripheral cable for a Seasonic modular cable.

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