Here is a link for the Mac OS 9 driver for the MFC-420cn:
http://welcome.solutions.brother.com/bsc/public/us/us/en/dlf/dlf/000000/000600/dlf000680.html?reg=us&c=us&lang=en&prod=mfc420cn_us&type2=1&os=9&flang=4&dlid=dlf000680
If you need a newer version of Mac OS , you would have to purchase it. Mac OS does not update from 9.1 to 10.X
Mac 9.1 is about 10 years old.
In May 2002, at Apple's
Worldwide Developers Conference in
San Jose, California,
Steve Jobs, accompanied by a
coffin, held a mock
funeral[5] to announce that Apple had stopped development of Mac OS 9. Mac OS 9.2.2, introduced in December 2001, was the final version of Mac OS 9, and the end of the classic Mac OS.
If I could be of further assistance, let me know. If this helps or solves the issue, please rate it.
Thanks, Joe
I’m happy to assist further over the phone at
https://www.6ya.com/expert/joe_8b8c2cd6ce148309
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