@craig1black What happens if you use a normal rj11 on a Mac keyboard cable ?? Inquiring minds….

@PredawnLight It swaps around the 5V and GND lines. I saw posts saying it doesn't do anything (other than not work.) Others say it damages the keyboard. ICs really don't appreciate having 5V and GND reversed -- so unless the keyboard has reverse polarity protection, it could damage it.

@craig1black Since they're completely reversed, you could make a Macintosh cable from two phone cables with a coupler!

@callanbrown Haha yeah, in a pinch that would work. I don't think RJ11 couplers are super common (unlike the larger RJ12 ones)

@craig1black Does that mean you can use a mac128k keyboard on a PC Jr, or does it have a different pinout from the other diagrams?

@RichardEstes5 The PCjr keyboard is not compatible with the Mac, even if it uses the same cable on the keyboard side. Different pinout and protocol. (The PCjr has some 2.54mm pin connector on the computer side)

@craig1black Of perhaps lesser interest, the Mac keyboard cables also work to connect keyboards to Atari Mega STE and TT machines!

@displaced80 AHH good one. I have Mega STE machine but lack the keyboard. I have been meaning to try to figure out how to at least temporarily use the regular STE keyboard with it (by cutting a RJ11 cable?)

@craig1black Thus saving many an Apple keyboard from ruin.

@craig1black Very useful, as using the wrong one can send the Apple to the Worms 😂

@craig1black crude tools do not make a crude product. Very clear! Thanks for sharing.

@craig1black This feels like the same sorta thing as the older PSU standard I don't remember the name of, the one that had the two cables and if you put the red together your dead? In this case though, it's black together.

@craig1black spent forever working on a DEC Vax computer before i noticed the MMJ cable it came with had wires crossed in it.

@craig1black Looking at the picture I'd say they are RJ10, rather then RJ11.

@craig1black Easy when you know how 😃.. Thanks for sharing Adrain👍 .. Just remember red to red , black to black , blue to bits 🤣

@craig1black so MacIntosh keyboards will work on Amiga 1000? 🤔

@craig1black Aren't those RJ10s? They look like handset cables (i.e. the cable connecting the handset and phone, not the phone and wall)

@craig1black I'm sure many keyboards have been fried due to this strange choice by Apple.

@craig1black Kind of surprised you don't make your own. The tools are pretty inexpensive. Finding coiled cable is more difficult - but you can make an adapter that would reverse the wires, just need an old phone line and an rj11 jack (even an rj45 would work, so rj11 fits in them)