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Key presses and running programs



#4

I'm after a bit more information on the way the HP67, HP29, and HP25 machines behave when a key is pressed while a program is executing.

The HP33 and HP34 both simply stop executing the program and stop at the current instruction (even if it is a pause) and otherwise ignore the keystroke.

Unfortunately I can't check the behaviour of the other models myself.

I believe that an HP67 will execute the keystroke if pressed while a pause instruction is executing but can't remember what happens if a key is pressed while a program is running. I did have some information but can't find my old notes at the moment.

I suspect that behaviour of the HP29 may be the same as the HP67 as they are both similar but I have no idea what happens on an HP25.

I'd really like to know if my assumptions are correct and what really happens on these models both when a key is pressed while a program is running (including a label key or GSB) and when a key is pressed during a pause instruction.

It might be interesting to compare this to the behaviour of current models like the HP20b so see which scheme 'won'..

Thanks

Mike T.


#5

Quote:
It might be interesting to compare this to the behaviour of current models like the HP20b so see which scheme 'won'..

I don't think the 20b is programmable, nor does it have a solver.

#6

Any HP29C owners out there..?


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