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No dedicated stack pointer isn't much of a problem. Stack growing up might be.

Isn't stack direction an ABI convention rather than language or processor limit? I mean if you are trying to run existing PDP-10 binaries (I don't know of any that are publicly available), sure. But just to get to the point that you are running bash and serving and HTML Hello World from Apache, it shouldn't be an issue.

> 8-bit bytes

Doesn't the C standard just specify the minimum range of datatypes, and the max? Don't know if you can tell the size of actual bit without triggering UBI. (obviously not a C programmer)

The standard specifies that you must have an independently addressable unit of storage that corresponds to the basic character set. The PDP-10 does not have this.

Interesting. Found this story:

https://stackoverflow.com/a/8061758/254477

So, it has been ported to some weird platforms.

Oh, there is/was a C compiler for the -10 (KCC), but it wouldn't support the modern dialects that the *BSD kernels are written in. Just having the language isn't enough, you have to be able to support the build chain of a modern kernel.

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