The dosbox dynarec core is now public:
https://twitter.com/m4xwdev/status/1109891893096300544?s=21
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Use quickmenu->controls.
Choose Keyboard + mouse
Go back one menu and forward again
Set user binds to keyboard keys you want. I use keyboard up down etc cursor keys to dpad etc. save core remap file to save your mappings.
For mouse control (already enabled by default), quickmenu->options, enable game pad mouse emulation. If it is enabled, you control the mouse pointer using right stick and ZL/ZR as mouse buttons.
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Nice! Sim city 2000 also works great