The 1.1 OS is needed BEFORE you insteall Ndless. ndless.bat does not install the OS, it just installs Ndless.
You'll need the 1.1 OS on your calculator, and 1.3 link software on your computer before you run ndless.bat
I'm not the real expert here, but I'm 95% sure that's how it works. I want to make sure to leave myself room for error. That's what I had to do, at least.

It will actually download the OS for you automatically if you don't already have a copy

Well, I'm glad that I left myself room to mess up, but I don't feel as bad if an admin with respect in the hundreds also made the same mistake.
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Say, why did you make the shirt key the start button instead of the control button? It would be symmetrical to the clear key for Select if you did. I always have to remind myself that it's one key lower than I think. Is there any reason you made it the shift key? I thought it may be to make contrast changes in-game, but I found out that you can do that just by hitting the + and - buttons. Will the calculator not allow you to use it?

Oh, I must have skimmed over the parenthesis. Another mistake on my part.
My computer keyboard is like that. There are some key combinations that I can't do that can throw me off when I play games. I should get a gamepad instead.

That could also present another problem. If you're pushing a directional key, and you skip in one direction or another, it would pick up the diagonal instead. I assume that they don't do anything in the emulator. If there were twelve buttons, three on each side, it would allow a bit of grace instead of having dead spots in the middle. It also makes it tough to switch directions quickly if you need to. Maybe you could add optional keys for people who would prefer them over the d-pad?Like you could have 4 be left, 8 be up, 6 be right, and both 5 and 2 would be down (for people who prefer arrow keys or the number pad). They might make more key combo problems, but at least you would still have the same number of keys being pressed at the same time.
...Although, being separate keys, it would be possible to press more than one of them at once, unlike the d-pad. Hm... What do you think?

The problem is that there are no diagonal keys on the gameboy, so if you do press the diagonal, even if you're also pressing the two buttons next to it, the calculator wouldn't be able to determine which way you meant to go because you're pressing a button half way between the two directions. It's like... is the x=y line closer to the x-axis or the y-axis? Well, neither.
(I finally changed my little picture to something else. ^^)

mhmm does it means there are no diagonal movements in gbc4nspire at all? I didn't really check when playing zelda