IIci & IIcx External PSU

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Brutus75

New Tinkerer
Aug 15, 2025
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Hi guys,

I have a few Mac IICI AND CX logic boards that I am recapping and testing but having to use the original PSU is a pain. What can I use as an alternative or maybe an extender?

thanks
 
RetroViator

RetroViator

Tinkerer
Oct 30, 2021
111
124
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retroviator.com
Brutus75 said:
What can I use as an alternative or maybe an extender?
Click to expand...
Yes, an 24-pin ATX power supply cable can be cut down as an extender for several ‘90s Mac PSUs.
IMG_1869.jpeg
Here is one connected to a Mac IIsi.
 
RetroViator

RetroViator

Tinkerer
Oct 30, 2021
111
124
43
retroviator.com
I suggest getting an extension cable with individual cables (like the one I have in the photo), and then use a hack saw to cut off the first ten pins that align with the Mac's power input jack. Be sure to check the orientation so you get the right pin alignments.
 
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