An Answer To "What is Mac OS X?"

XCube writes: "'What is Mac OS X?' is a fascinating article over at KernelThread.com. According to Amit Singh it's a hacker-over-friendly answer to that question and a low-level taste of Apple's OS. The extensive article covers many details on Mac OS X: history, Mac firmware & boot loader, system architecture, kernel, startup, file systems, app environments, programming facilities, available software, and more. A great read if you are interested in Mac OS X, though some stuff is too technical methinks. On second thought, this may be a better read if you're *not* interested in Mac OS X! The author says he wrote it to introduce Mac OS X to the Linux User's Group at his work."

Comments

Carbon's roots are older

[saddino]

Carbon. This is a set of procedural C-based APIs for Mac OS X that are based on the old Mac OS 9 API (actually dating back as far back as Mac OS 8.1)

To nitpick: actually, a lot of the Carbon APIs go as far back as System 1.0 -- most of QuickDraw for example.

Re:OS X on x86, I wish

[JudgeFurious]

Well, then I'm thinking your best bet is to go out and find yourself a used blue and white G3 (can be had very reasonably priced on ebay IF you take your time and don't rush it) and follow that with a CPU upgrade. They're coming down to a fairly comfortable price for those machines. Get that B&W going about 500Mhz and add Panther. Don't worry about the price of Panther (I figure if you're going to pirate XP then why pay for Panther?) and you got your firsthand look at OSX.

I pretty much did it that way and then decided I loved this shit enough to give them $3K to see it run on their new machines. I'm not the least bit disappointed either.

Everybody's different but as far as I'm concerned to hell with Windows and screw waiting on Linux to get it's collective desktop shit together. OSX beats both.

Re:Potential Linux Switchers: Read Up

[drinkypoo]

I agree that open firmware is a thing of beauty. However we should eventually attain the same level of convenience with LinuxBIOS. (The problem right now is diminutive EEPROM/FLASH bios.) However on PCs you no longer have to worry about IRQs, DMA conflicts, or IO ranges, as long as you're not using legacy hardware. These days, some machines even have no ISA bus whatsoever - Even the legacy PS/2 keyboard and mouse are on PCI. Macs still have to deal with interrupts and such, they just don't bother you with it, and neither do modern PCs. I haven't had to deal with IRQs and shit since the last time I installed a non-pnp ISA card. Which was a long, LONG time ago.

Mac hardware hasn't been special since PCs went to the PCI bus and apple hardware stopped having the drivers in rom on the card. NuBus was a paragon of autoconfiguration equalled by no one but the Amiga. But now that drivers are in the software and not adapter ROM, that advantage is nonexistent.

It's also worth pointing out that until the G5, apple hardware has had poor bus architecture and slow memory buses. So while the designs are supposedly clean (I have a yosemite so I know that is a lie; I am also familiar with the IIfx, which didn't even follow Apple's standards, let alone anyone else's, and even needed a nonstandard SCSI terminator) they have usually been dated. The G5 is an exception; it sure would be nice if OSX were 64 bit though. Apple finally has the superbadass hardware, and their OS doesn't even take full advantage of it. By the time they have a 64 bit OSX, AMD's hammer chips will have come down further in price, and XP-64 will be running on them, and they'll squander their "lead" once more.