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HT? Jesus man throw us a bone here...

Ermmm... It's a file viewer that is simply called "ht" 😉

*** Rewrote thread's title for added clarification ***

Actually the error message would have been quite helpful
(unhandled illegal opcode message by the extender).

They use rdtsc, a pentium-class opcode which is not
handled by dosbox (as dosbox is 80386 mainly). Don't
really understand why they have to use rdtsc.

hmm implemented that thing once.
Mortezumma's revence or so wanted it as well.
Didn't commit as it's a pentium instruction.

wd wrote:

Actually the error message would have been quite helpful (unhandled illegal opcode message by the extender). […]
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Actually the error message would have been quite helpful
(unhandled illegal opcode message by the extender).

They use rdtsc, a pentium-class opcode which is not
handled by dosbox (as dosbox is 80386 mainly). Don't
really understand why they have to use rdtsc.

Does any DOS games use that instruction?

Would it break anything to implement a Pentium instruction?

well dosbox doesn't emulate a pentium (yet). Don't see that much reason for it.
Games might think they run on some weird pentium clone if it rdtsc works and start using more pentium instructions.

Hmm. It should make some sense in a point where emulation would be more mature. On the other hand, having that option as selectable (choose cpu to emulate. I am not talking about speed here, just set of cpu instructions supported) would be nice.