Well, I don't have the Wang or the Tekky, and my IME is just a 4-function non-progammable thing, but I do still actively use and hack the HPs. My 9820 is non-working at the moment (bought that way on E-bay, the seller was honest about this, and the machine is in great condition otherwise), I've not had time to look at it. Mind you, I am not sure the 9830 counts as a 'calculator', no matter what it says on the case. It programs in BASIC, it's got an alphanumeric display, a few K of program memory, and can link to peripherals (I have the HPIB module in mine). Sure sounds like a computer to me :-) Internally those HP machines are fascinating. The 9100 is probably the most elegant piece of electronices it's ever been my pleasure to work on. The 98x0 machines have an interesting bit-serial processor. Of course you totally ingorne the HP service manual (aka boardswapper guide) when repairing thse machines, in the case of the 98x0s, my first move is to look at the signals on the test connector on th CPU control PCB (09810-66513 IIRC, anyway, brown and orange ejectors) and see what the microcode is doing. -tony