make sure you are not using by mistake joystick's hat up/down/left/right buttons 😉

Sorry, I still can't figure this out. Can somebody walk me through this step by Step or make the mapper file for me? Thanks.

I am trying to map Left/Right/up/Down/ to a/d/w/s. Can somebody map these keys and attach the mapper file here? Thanks.

I assume you mean that you want 'A' to appear in dosbox when you press the "left arrow" on your keyboard, etc. Open dosbox. Press ctrl-f1. Click on the "left arrow key" on the picture. Click on Del to delete the keybind on it (you probably don't want your left arrow key to produce both a "left arrow key" and an "A" in dosbox). Then click on the "A key" on the picture. Click Add. Press the "left arrow key" on your keyboard. Now you have two keys bound to "A": the "A key" and the "left arrow key". If you want to remove the "A keybind", click Next, then Del. Do this for the rest of the arrow keys. Then click Save (this creates the mapper.txt file). Then click Exit.

PS. If I bind both the "A key" and the "left arrow key" to "A key", I get this line in mapper.txt:

1key_a "key 276" "key 97"

PS2. If you meant the other way (i.e., press 'A' on your keyboard to generate a "left arrow key" in dosbox), you can probably figure it out from these instructions.

Actually I wanted it the other way. 😀

Any way, I got some weird results when I tried to follow your directions. For example, a now type ak in X-com.

Could you map the remaining key for me, to save me this headache? when I press a, I want Dosbox to type left. I am doing this for those old FPS game that doesn't allow you to reconfigure to wsad.

Thanks.

Nevermind, got it to work. Thanks much!