That was unbelievably vague.
Intel Macs are based around a mostly traditional x86 architecture, all models include an Intel CPU.. other hardware differs, some models use NVIDIA chipsets and others use an entirely Intel based chipset.
The lack a legacy BIOS natively, it uses EFI to load Mac OS X.. an emulated BIOS is provided so that traditional x86 operating systems can be booted.
Perhaps it's safe to say they all have USB controllers, "HD Audio" (azalia), not all models use the same Ethernet/Wireless chipset, graphics can be from Intel/ATI(AMD) or NVIDIA, they include PCI PATA/SATA controllers in IDE or AHCI mode from a variety of vendors.. a Firewire controller in some(..or all) models, and finally USB UVC-compatible cameras that require a firmware to operate.
No legacy PS/2 emulation, the keyboard and mouse are USB devices.
People boot OpenBSD/NetBSD/FreeBSD on different models and submit the dmesg's to the mailing lists, it shows that they don't all share the same type of hardware.. you should however be able to install any off-the-shelf PCI devices these days, granted you'll need a custom driver for OS X.
Do that help?
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