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by scarface74 2541 days ago
There is a Mac program BBEdit that was first written to target 68K 32 bit Macs, then PPC 32 bit Macs, then 32 bit x86 Macs and then 64 bit Macs. Probably within the next 3 years it will target ARM Macs.

The author said he never did a full scale rewrite. He slowly migrated code from one platform to the next.

Today, Apple’s code runs on both ARM and x86 and with Marzipan, as will developers code. True most will be in Objective C, but some low level code is still in C.