> John Chung wrote:
> 
> > I am quite satisfied with simple breakpoints. :)
> 
> Well, I make do mostly even without them :)
> 
> But having a deep execution history is /really/ nice. 
> Something goes wrong, you stop it, and just browse through 
> the history (that's linked to the source code) and see 
> exactly how and why it got there. With full bus trace
> -- which means that you not only have the addresses where the 
> code went, you have all the values the CPU read or wrote 
> also, be that registers, memory locations, IO ports, HLL 
> variable values, anything. This is not something even a 
> comfortable PC debugger can give you. 


Quickbasic v3 (possibly v4 as well) would let you run programs backwards (up
to about 20 instructions IIRC) from a breakpoint.

I wrote an emulator that tracked everything, and would let you jump back to
any point, and then restart the program.  Thankfully it was a very HLL (sort
of) with very few instructions per second.

Tony

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