• Hello, Guest! Welcome back, and be sure to check out this post for more info about the recent service interruption and migration.

Macintosh Portable 34 pin to 50 pin SCSI cable


Well-known member
On the pic earlier in the post with the black resistor thingy.. that's the image I used.. what ground should 2,6,11,and 16 be grounded to?? The set of pins 27,28,29, and 30?? Or is there a pin they should point to on the 50 pin?? I don't see a ground on the 50 pin.. just the set for the power on 27,28,29,30




Well-known member
That's a pretty steep price for a cable.

Judging from the picture, though, it looks like it's very well made.

I find Uniserver's to be more than adequate, though (if not somewhat less polished, but who's going to see it anyway?)




Well-known member
well i made quite a few for hap. did the one he sent you look like this one?


because that is pretty much how the final revision looks.



Well-known member
Yeah, it looks a lot like that.

I made a slight modification, though; I took a utility knife and trimmed the ribbon cable at the 34 pin end so that it's flush with the connector.

How much do you sell these for?




Well-known member
I thought this might make things a bit easier. When I took apart my LC to install a second hard drive I saw this bugger. Soldering wires to this would seem really easy to do from a 34 wire ribbon.

Just my 2 cents.



Well-known member
but then how will you install your HD into your poor LC now?
Well its back in the LC. But these are not hard to find. I may pick up a one and try. Just need my portable to work first! But I would also like to mount the drive in another Mac to check contents too.



Well-known member
Love it Uni!!! Nice... I'm sure I will be buying some!!!! Also the Japanese guy last time I checked was selling the 34 to 50 pin cables on ebay.. not sure if they are still there.. I assume they are.. :)




I have a very nice functioning Portable but I'm worried about the 20+ year old HDD. I'd love to replace it with a CF card, but for that I'd need one of those infamous 34-to-50 adapter cables. I don't really want to risk making my own. I'm wondering if someone here maybe has a spare one, or could make one for me?

Given that I'm new here I'd gladly pay in advance.

Thanks for every one for the useful information 



Active member
Hi Guys,
Update on this small project. I managed to assemble the adapter cable without any welding, just plain crimping. Result is quite neat and fits nicely (overall length: approx 30 cm, connector to connector).
The board I have (v5.0a) must be powered, so I couldn’t do without the (oversized) molex connector.
Mounting brackets are also minimal, no need to go for “exotic” 3D printed solutions: it’s just two “L” shaped Aluminium profiles, which - by chance - are “naturally” clamping the board in a very effective way, as there’s a groove that is just perfect for the purpose. So, no screws, no nothing.
I’m using an “oversized” 16 Gb card (smaller ones are getting hard to find), virtually partitioned in 4 units of 2 Gb each (SCSI address 0 to 3).
I have formatted the “drives” using Apple utilities (patched).
System is now working very fine (battery reconditioned, too), but I have noticed that after putting the Mac at sleep, it kind of struggles to wake up and sometimes I need to reset the machine as it hangs forever... 
Another point: if I connect a SCSI CD ROM (ID: 4), sometimes (not always) at start up partitions 1 to 3 are not automatically mounted.
Any clue on how to tune this setup?




Last edited by a moderator: