HP-25C Eumulator

[Craig Bladow]

I've attached screenshots of the design. I've not shown the back cover which attaches with 4, #4 x 1/2 inch, flathead Phillips wood screws. The PCB has one mounting hole which is used with the same size screw as the back cover and a printed washer. No provision is made for a red filter for the led display although one could possibly be attached. The display is recessed a bit which helps somewhat with reducing reflections off of the led modules. The only legends printed are those on the top of the keys, the other functions could be added by an overlay, any volunteers? The power switch (I have the black pcb kit so your power switch could be different) is well protected which also means it may take some dexterity to operate.

Notes on possible future refinements:
1. Rounding the case cutouts to match the keys.
2. Improving the minus, divide, summation and round down key legends as this design currently uses what is provided by "Liberation Sans Bold" font.
3. Widening the Enter key.