Nearly a decade ago, I wrote a post about building a serial adapter/cable for the FX-880P (and FX-850P) calculator. The design I went for was a bit over-engineered. The circuit was made of two independent parts on the same PCB; one that was a straight connection to the calculator via a 15×2, 1.27mm pitch header, […]
Some Background I’ve been collecting calculators for a while, and very recently I’ve been obsessed with the Voyager series of RPN calculators designed and manufactured by HP in the 80s. While the series included several gems, like the HP 15C “Advanced Scientific Calculator”, and the HP 12C “Financial Calculator”, the most elusive model for me […]
It happens that I quite like scientific calculators, and lately I’ve been adding a few to my collection. Several calculators are CAS (“Computer Algebra System”)-capable, meaning they are powerful enough to do symbolic / algebraic processing, and thus are able to understand and manipulate algebraic expressions containing any mix of unknowns, operators and numbers, and […]
Background Back in the ’80s, Casio produced a line of calculators that was sold and advertised as “pocket personal computers”. This branding started with the PB-100 I believe, but the device concept started with a previous model, the FX-702P, produced in 1981. While by today standards that claim seems a bit of an stretch, it held quite a bit of ground back […]
Long ago (like… REALLY long ago) I made this program called SpritED, which was basically a humble sprite editor for TI-calc* developers. While it didn’t attain worldwide fame like other programs I made at the time, it was a tiny useful tool for a handful of developers and that was more than enough to make me quite […]