Which calculators had no known bugs?

[Thomas Okken]

(11-13-2017 06:54 PM)Dieter Wrote:  

(11-13-2017 01:33 PM)PANAMATIK Wrote:  Finally I discovered a bug in the HP-29C, which I didn't have seen mentioned before.

If you enter all 98 program steps numbers and run, the program can't be interrupted. You have to switch off the calculator.

What? Do you want to say that any program that uses all 98 steps cannot be interrupted?

Dieter

I think he meant: fill program memory with numbers (0-9).

It sounds like the 29C will keep running when you try to interrupt a program that is in number entry mode, and only stop once it reaches a non-number instruction. Sounds like a good feature, and it anticipates the single-line non-interruptible numbers in the 41C.

I can't say I ever noticed this behavior in my 19C, but then again I never looked for it, either. Once you are aware of it, filling program memory with numbers is a fairly obvious potential bug case to check.