zmodload zsh/terminfo

autoload -U down-line-or-beginning-search
autoload -U up-line-or-beginning-search
zle -N up-line-or-beginning-search
zle -N down-line-or-beginning-search
bindkey -M emacs  "${terminfo[kcud1]}" down-line-or-beginning-search # down
bindkey -M emacs  "${terminfo[kcuu1]}" up-line-or-beginning-search #up