I'm running 0.71 version of a Dosbox port on my PSP

I've wrote a file to map the keys to KQ1, which is playing fine

Such as

@ECHO OFF
INPUTMAP up up
INPUTMAP right right
INPUTMAP down down
INPUTMAP left left
INPUTMAP cross enter
INPUTMAP select esc
INPUTMAP exec sierra

How would you enable text entry in a dos game, and be able to scroll through letters??

Cheers

Tom