[TUHS] First Unix-like OSes not derived from AT&T code?

[Al Kossow]

On 5/2/22 7:14 AM, Miod Vallat wrote:

> The compiler was Metaware High C. GCC could not be used to compile the
> kernel sources unchanged, because one of the locore->trap.c paths was
> relying upon the stack layout used by the compiler. With that fixed, gcc
> could be used to build a working kernel.

does that kernel source tree survive anywhere?