It was not a clean rewrite for each platform. It wasn't even a clean rewrite for each processor. Forensic analysis proves this. For example, the MICROSOFT! East

It was not a clean rewrite for each platform. It wasn't even a clean rewrite for each processor. Forensic analysis proves this. For example, the MICROSOFT! Easter egg from the 6502 version of Microsoft BASIC remained in the 6809 version even though there is no longer code to display it. Source: https://www.pagetable.com/?p=43 https://www.pagetable.com/?p=43