Ugly prompt with ksh

[al1_24]

I would like to use ksh as shell but, if most of commands work as
desired, an ugly prompt is displayed before each line, something like
"[e]0;wa]n[e[32m]u@h [e[33m]w[e[0m]n$", until I change the PS1 value.
Is there a way to get the "user@host pwd $" prompt inside ksh ?

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