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I made a post in your WTB topic before I saw this topic. I will repeat what others have said: you can make your own keyboard cable in about an hour's time as long as you have: scissors, soldering iron, and a telephone handset cord. You just cut the cord in two, then reverse the wire connections. You'll see they're colored, so just flip one side of the cut cord around and solder it back together.
I'm going to write an entry on doing this in my Mac 512K blog pretty soon; I did it myself about 3 or 4 weeks ago. Once you do this, the cord won't work on the telephone anymore. That's the only downside.
How do we know it's not static electricity? I think we need more people to try this and see what happens. Or maybe that's a really foolish and terrible idea? According to the pinout if you use a rolled telephone cord in place of Apple's cord you'll be putting +5v to ground on the keyboard end, which is plenty to destroy integrated circuitry of that era. The fact that it didn't happen to you could be, as mentioned before, 'luck', or I suppose it's possible, depending on the vintage of your keyboard, Apple might have started fitting the ground line with a protective diode just in case to cover users if they made this mistake. (That's utter speculation based on nothing, I don't plan on cracking open the two RJ-11 keyboards I have to see if there might be a difference like that between the early keypad-less one and the plus keyboard.) Seriously, don't just 'try it' unless burning up old computers is your idea of a good time. That's utter speculation based on nothing, I don't plan on cracking open the two RJ-11 keyboards I have to see if there might be a difference like that between the early keypad-less one and the plus keyboard.) Seriously, don't just 'try it' unless burning up old computers is your idea of a good time.
Dan Kottke, digital engineer at Apple who co-designed the Macintosh keyboard with Ed Riddles, says otherwise: ' The ke y b oar d connects t o th e M ac in tosh v i a a m od ular co il cord t ha t i s s i m il a r t o thos e u sed o n t e l ep hon es. The Mac ' s co rd h as h eav i er ga u ge w ir e to prevent drop s in vo lt age that don ' t s t o p yo u f r o m und e r s t a ndin g ph o n e co nv ersa ti o n s but can int er fer e with the accur ac y of th e digi t a l s i g n a l s the Ma c u ses. If yo u r ep l ace the Mac ' s c o rd w ith a t e l ep h o n e h andse t co rd, it doesn't damage the keyb oa rd 's m i cro proce sso r, but it wo n't work. ' Source: MacWorld Sep-Oct 1984, pg 35. Dan Kottke, digital engineer at Apple who co-designed the Macintosh keyboard with Ed Riddles, says otherwise: ' The ke y b oar d connects t o th e M ac in tosh v i a a m od ular co il cord t ha t i s s i m il a r t o thos e u sed o n t e l ep hon es. The Mac ' s co rd h as h eav i er ga u ge w ir e to prevent drop s in vo lt age that don ' t s t o p yo u f r o m und e r s t a ndin g ph o n e co nv ersa ti o n s but can int er fer e with the accur ac y of th e digi t a l s i g n a l s the Ma c u ses.
If yo u r ep l ace the Mac ' s c o rd w ith a t e l ep h o n e h andse t co rd, it doesn't damage the keyb oa rd 's m i cro proce sso r, but it wo n't work. ' Source: MacWorld Sep-Oct 1984, pg 35. Note that Dan is a digital engineer. He has clearly not run many (or any) experiments, and is just voicing an opinion. He would not get a good grade in my circuits classes. His answer about the 'heavier gauge wire' is utter nonsense. The currents flowing (both signal and power) are so small that any voltage drops would be completely negligible.
The real reason for the incompatible cable is simply that Apple has traditionally wanted to force users to buy Apple widgets. In contrast with Dan, I'm an expert in the sense that I have learned from the vast number of mistakes I have made, or have seen others make, whence wisdom and scar tissue derives. When you use an ordinary telephone cable in place of the correct keyboard cable you are applying power to the keyboard in REVERSE POLARITY. You are not simply 'grounding 5V'. Although doing so doesn't guarantee keyboard destruction, it certainly makes it likely.
You are relying on the Mac's power supply limiting the current to a value below that which would destroy the keyboard electronics. That's an unsafe bet, as the current limit is set to protect the power supply, not devices connected to it. As to your static electricity hypothesis, note that the impedance levels are much reduced on the keyboard when reverse polarized. If static electricity were strong enough to destroy the keyboard in that condition, then you would see a great many failures from static electricity when using normal cables. It ain't static.
It's reverse polarity. No more experiments needed, and no appeals to Kottke's ill-founded opinions will change that. When you use an ordinary telephone cable in place of the correct keyboard cable you are applying power to the keyboard in REVERSE POLARITY.
You are not simply 'grounding 5V'. To be clear, that's what I said, if not quite so clearly; you're applying +5v to the side of the circuitry in the keyboard that's supposed to be connected to ground. (Obviously the real 'ground' in the circuit is on the Mac side, not the keyboard.
And, yes, by flipping the leads you've connected the 'positive' side of the keyboard to that. So yes, if current flows it's going to be in reverse.) Seriously, there's no defense for suggesting people try this for laughs.and. that quote from the Apple 'engineer' is just gobbledygook. Telephone cables work if you cut the end off and flip the pinout, Dog Cow said that himself, for sheesh's sake! Note that Dan is a digital engineer. He has clearly not run many (or any) experiments, and is just voicing an opinion.
Keyboard For Mac Mini
He would not get a good grade in my circuits classes. His answer about the 'heavier gauge wire' is utter nonsense. The currents flowing (both signal and power) are so small that any voltage drops would be completely negligible. The real reason for the incompatible cable is simply that Apple has traditionally wanted to force users to buy Apple widgets. In contrast with Dan, I'm an expert in the sense that I have learned from the vast number of mistakes I have made, or have seen others make, whence wisdom and scar tissue derives. When you use an ordinary telephone cable in place of the correct keyboard cable you are applying power to the keyboard in REVERSE POLARITY.
You are not simply 'grounding 5V'. Although doing so doesn't guarantee keyboard destruction, it certainly makes it likely. You are relying on the Mac's power supply limiting the current to a value below that which would destroy the keyboard electronics. That's an unsafe bet, as the current limit is set to protect the power supply, not devices connected to it. As to your static electricity hypothesis, note that the impedance levels are much reduced on the keyboard when reverse polarized. If static electricity were strong enough to destroy the keyboard in that condition, then you would see a great many failures from static electricity when using normal cables. It ain't static.
It's reverse polarity. No more experiments needed, and no appeals to Kottke's ill-founded opinions will change that. I take it you dont know who Dan is.