Octal

Well, it's sort-of a computer, and I think it's a classic, so here goes... I've had a lot of trouble in Voyager series calculators (HP10C, 11C, 12C, 15C, 16C) with dry joint,s particularly on the second version with everything on one PCB (as opposed to a logic/display module with the ICs on a flexible PCB which connects to the keyboard via a zebrastrip). I've brought a number back to life by resoldering the ICs. The 2 ICs are the NUT (processor and keyboard interface) which is a modified version of the CPU in an HP41 (the same datasheet seems to cover both). That's the smalelr of the 2 chips. The larger one is called R2D2, stabding for ROM/RAM/Display Driver. The Nut is the same in all Voyagers (apart from very late 12Cs, which are very different inside), the R2D2 is specific to the model (it contains the ROM code that implements the functions of that model). I assume you know the case screws are under the stick-on feet. Let me know if you ever need to repair it. I've got more information that I can't easily post to the list. -tony