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Here are some words what I wrote.

breakintoprogram.co.ukI Accidentally Wrote an Emulator (Part 7) - L Break Into Program, 0:1In the previous articles I discussed: It was time to embark on a side mission. Emscripten Emscripten is a toolchain that will compile native C and C++ to WebAssembly (webasm). WebAssembly is a low-lev...

L Break Into Program

@breakintoprogram.co.uk

2 Sept

Note for Windows PC users - apologies for the shift keys not working properly. I've mapped left shift to CAPS SHIFT and right shift to SYMBOL SHIFT. For some reason a KEYUP event consistently goes missing when you hold both shift keys then release one or both. Works fine on Linux and Mac.

L Break Into Program

@breakintoprogram.co.uk

2 Sept

Word on the street is that this is some weird legacy Microsoft Windows thing, which I've confirmed with a test Windows app I wrote. I can't find any official documentation on this though other than a mention in this thread. github.com/libsdl-org/S...

L Break Into Program

@breakintoprogram.co.uk

2 Sept

I'll be updating the emulator shortly so that it uses another key sequence for Windows users.

L Break Into Program

@breakintoprogram.co.uk

It's probably telling that the other online emulators I've tried (jsspeccy, qaop) use left shift for CAPS SHIFT and alt-gr for SYMBOL SHIFT. Might as well fall in line with them.

3/9/26, 9:46 am0 reposts3 likes

L Break Into Program

@breakintoprogram.co.uk

3 Sept

Ah, just found one that uses both shift keys and it suffers the same problem as mine. This one appears to be written in JavaScript.

zx.researcher.suZX Spectrum emulator onlineLow-level emulation of devices. Wide image and snapshot formats support.