iMac system architecture

[usb20]

Hello

Sorry about this question, but I'm Mac novice .

I use iMac (21.5-inch, Late 2009)
Version 10.12.6 macOs Sierra

Now how can I find out what platform and system architecture do I have?

=>> Where platform is your OS and arch is you system architecture.

Who can help me?


Thank you

 

[kschendel]

You don't specify why you want it or for what purpose. There are a ton of architecture codes that have been invented for various purposes. Your machine is basically an x86_64 (intel 64 bit) running Mac OS 10.12.6, which you apparently know already.

In a terminal, try:
uname -a
machine