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Mac2Windows

Windows XP on Macintel a Reality

- 2006.03.23 - Tip Jar

When Apple released the first of its Intel-based Macs, there was immediate interest in running Windows on them - not necessarily to replace Mac OS X, but as an additional option, allowing Macintel owners to run software (like Microsoft Access database) that doesn't have Mac equivalents without performance-sapping workarounds like Virtual PC (which isn't available for the new Macs in any event).

There was an initial optimism; it ought to be easy. After all, these Mac models were using the same sort of Intel CPU as all millions of Windows systems. But as I pointed out in my January 24th article, Windows on Intel Macs? OS X on PCs? Don't Hold Your Breath, it was harder than it looked.

The Intel Macs use a new-generation startup called EFI Extensible Firmware Interface) rather than the PC-standard BIOS used on nearly all Windows systems. Windows XP (and earlier versions) has no built-in support for EFI.

In fact, while there was early hope that EFI would be supported in the upcoming Windows Vista operating system, Microsoft recently announced that only 64-bit versions of Vista would have EFI support.

The Intel Macs are 32-bit systems.

As it became clearer that getting Windows to work on the Intel Macs would be a challenge, Houston shipping broker Colin Nederkoorn decided to formalize the challenge. He offered what started off as a $100 reward and solicited donations to up the ante for the first demonstration of Windows running on a new Mac. Eventually nearly US$14,000 was donated to OnMac.net.

There were some conditions: Windows needed to coexist with the Mac OS, the two operating systems must not interfere with one another, and upon boot up, a user would need to be able to choose between the two operating systems.

On March 16th, two Bay Area software developers, Jesus Lopez and Eric Wasserman, won the prize. (Lopez says he never owned a Mac before buying one to work on the challenge).

Details of the steps necessary to create a dual-boot system have been released and are available for download from OnMac.net. They have been open-sourced, allowing the developer community to improve on them.

I haven't tested them, but while they appear do-able, they're not for the faint of heart. As a first step, they require setting up separate partitions on the Mac's hard drive for OS X and Windows. Using Disk Utility on the OS X install CD, this would require nuking your current OS X installation and all the hard drive contents. An EFI bootloader is included in the download.

boot screen

Apparently, when the grey screen with the Apple logo appears at the beginning of startup, this process allows a user to press the down-arrow; that brings up a Windows logo on the grey background. Pressing enter confirms the choice of Windows, and bootup continues to the Windows XP system.

The solution has been demonstrated working on 17" versions of the Intel iMac, the new Intel Mac mini models, and the MacBook Pro.

Nederkoorn is hoping that the open-source development will help it evolve into something that's easier to apply for nontechnical computer users.

Alan Zisman is Mac-using teacher and technology writer based in Vancouver, BC, Canada. Many of his articles are available on his website, www.zisman.ca. If you find Alan's articles helpful, please consider making a donation to his tip jar.

Recent Columns by Alan Zisman

QuickTime X in Snow Leopard Imports, Trims, and Publishes Video Quickly and Easily, 11.04. The long, slow process of importing video into iMovie to edit it, then render it to another format, is history as QuickTime X does that much more quickly.
Another Hard Drive Disaster Ends Happily (Thanks to Time Machine), 10.29. This time it was the MacBook's drive that failed. Thanks to automated Time Machine backup, recovery was easy, although far from fast.
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More in the Mac 2 Windows index.

Links for the Day

Mac of the Day: 17" iMac G4/800 MHz, July 2002 - The iMac 'grows up' with a 17" 1440 x 900 display.
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November 8 in LEM history: 99: OS 9: I think I like it - 01: The simplified Mac life - Soured on Windows - Flea market Mac - 02: Little room for improvement in new 'Books - Combo drive upgrade for iceBooks - 04: Re-Porter - 05: Fix the old iMac or buy a Mac mini? - Apple's Copland project - 06: MacBook Core 2 - MacBook value equation - Cheap is as cheap does - 07: Problems with Classic mode in Tiger - The G4 Power Mac that won't run Leopard
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