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MkLinux: The delightfully weird PowerPC Mac Linux Distro of the 1990s
Co-Developed by Apple, with Linux running as a user-mode task. Seriously.
June 01, 2023
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In 1996 -- just two years after Linux, itself, hit version 1.0 -- a version of Red Hat Linux was ported to PowerPC Macintosh computers... by Apple.

Seriously.

The very same Apple that currently opposes people running macOS on any non-sanctioned hardware -- and who fights (rather hard) to keep non-macOS systems from running on Apple hardware -- used to actively help port other systems to the Macintosh computers.  My-oh-my how times have changed.

Known as MkLinux -- short for "Micro-Kernel Linux" -- the development was a joint project between Apple and "The Open Group Research Institute" in France.  And it was a truly fascinating beast... because it wasn't quite your typical "Linux" system.

In fact, MkLinux really consisted of two different kernels:

  1. "Open Group Mach" -- a variation of the Mach microkernel which had been ported to a number of platforms, including: HP PA-RISC, x86, and (of course) PowerPC Macintosh.
  2. "Linux" -- a port of the Linux kernel itself.

What made MkLinux so strange... is that "Open Group Mach" was the lowest level kernel.  It would boot the system and provide a subset of hardware access... then "Linux" would actually be run as a task within "Open Group Mach".

A user mode task, no less!  Yes, in MkLinux... the "Linux" kernel is run as a standard, user-mode application!

Wild!

Over the years, MkLinux gained support for a number of different PowerPC Macintosh models (including some G3-based machines)... and, reportedly, had somewhere between 50,000 and 100,000 total users before eventually being all but abandoned by Apple and moving to become a small, community project.

I have personally run MkLinux on a Power Macintosh 6100 running at 66 Mhz.  Was it a speed demon?  No.  It felt quite a bit more sluggish than MacOS (7.x or 8.0) on the same system.  But, you know what?  It was a surprisingly usable Linux system!  Mostly stable, and fairly high quality!

In order to preserve some of the memory of this marvelously weird Linux "distribution", what follows is a bit of a visual tour of what using MkLinux was like on PowerPC Macs of the 1990s.

The official MkLinux website (note that it was hosted by Apple itself):

0141f1.jpg

As part of the installation process, you would place the Mach Kernel and bootloader into your Mac Extensions folder.

 

The MkLinux boot screen (a MacOS application that launched when your Mac booted... with buttons that let you choose whether to boot Mk Linux or MacOS):

Splash Screen

The MkLinux Installer!  Note this is a slightly modified version of the old Red Hat installer:

Installation Path

What kind of Mouse?  An ADB (Apple Desktop Bus) mouse, naturally!

MouseConfig Screen

Screenshot from a PowerBook 1400cs/133 running a customized MkLinux DR3 (Developer Release 3) installation:

pb1400cs-mklinux-080119-03-gif.814865

Another screenshot of MkLinux DR3:

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You can find an archive of the very first release of MkLinux on Archive.org, and a great deal of in-depth details at MkLinux.org.  Unfortunately, that site hasn't been udpated since 2009.  Just the same, the information is historically fascinating.

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This episode is free for all to enjoy and share.

Be sure to subscribe here at Lunduke.Locals.com to get all shows & articles (including interviews with other amazing nerds).

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50% Off Lunduke Journal Extended Through Monday (Oct 13th)

Just a quick heads up:

The “50% off every kind of Subscription to The Lunduke Journal” sale has been extended through Monday (October 13th).

So. You know. Grab one at 50% off between now and end of the day on Monday.

To all of you amazing nerds who have picked up a Lifetime Subscription already this weekend: You are awesome. You’ll be receiving a confirmation email, with all of the Lifetime Subscription details, by tomorrow (if you haven’t already).

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Sale ends in a few hours, Lifetime Subs set up.

Holy moly, you guys are amazing.

A few days ago I published a “50% off” sale for Lunduke Journal subscriptions… and all of you showed up. In a big way.

To everyone who grabbed a Lifetime Subscription over the last few days: All of you are set to full Lifetime access. You should have a confirmation email in your inbox. If not, email me and I’ll make sure you’re setup properly.

That “50% off” sale ends tonight at midnight. So you have a few hours to snag a discounted subscription, if you haven’t already.

A huge thank you to everyone who supports this work. Couldn’t do it without you.

-Lunduke

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The Asymptotic Line of the Lifetime Lunduke Subscription
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The Lunduke Journal’s World Famous Lifetime Subscription (tm) was introduced 3 years, 3 months ago.

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At that price, the cost “Per Month” of a Lifetime Subscription, after 39 months, is $3.85.

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Based on that, sure does look like good odds that Lunduke is going to be doing this sort of reporting for a very, very long time. Which makes the Lifetime Subscription a safe bet.

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My suggestion?

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  2. Enjoy the perks (like forum access and the downloadable shows and books).

  3. Never need to worry about paying for a monthly subscription again.

  4. High five yourself every month, as the “Cost Per Month” of your Lifetime Subscription steadily moves towards 0.

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