JM-15S - feedback welcome

[jwm]

Hi all, I have been working on yet another alternative firmware for the HP-30b and was curious if anyone had any feedback.

The main difference between this and the WP series is that the feel is based on the voyager series (15C) rather than the 42S, in particular, there are no catalogs. Everything the calculator can do is on the label or on the cheat sheet on the back or is a user program. The goal is to be a 15C with some 12C and 35S features added in terms of functionality.

In order to get the most out of a limited set of keys and faceplate real-estate, a few techniques are employed. it utilizes 2 shift keys + XEQ.

- an unlimited stack, meaning I can do without shortcut functions, [2][y^x] behaves the same as [f][x^2]. Additionally, special keys for entering complex and vectors are not as important, as they can just be slurped off the stack. [3][ENTER][4][y+ix] to enter 3 + i4. A 'FILL' register is used to fill in past the end of the stack so various tasks depending on duplicating T still work.

- whenever a menu is active, the [f] and [g] keys don't do anything. so they behave as the up and down rather than having dedicated up and down keys. The menu is used to navigate the same info that is on the back cheat sheet, rather than necessary for normal usage.

- some keys on the 15C exist only to have special meaning when used by STO/RCL, I explicitly include STO/RCL behavior on the faceplate and use the same mechanism for setting other system options. such as current base, modular arithmetic mod, fill register, etc. They are labeled pink above the keys.

The keys are not quite complete, I am pretty sure I could use some more stack manipulation keys and something for the SST functionality in particular.

   

and the back cheat sheet