mtcvtv23: command not found

Maybe Your $PATH variable doesn't contain the default paths? echo $PATH should give something like:

[root@server ~]# echo $PATH
/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin

If it's empty, You may set the PATH variable with this command

export PATH="/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin:/root/bin"

On Debian possible default full paths are:

/usr/bin/mtcvtv23 - from package: simh

You may install the required package with command apt-get install {package}

Error in other languages:
mtcvtv23: bevel nie gevind nie
mtcvtv23: comandă negăsită
mtcvtv23: comando não encontrado
mtcvtv23: commande introuvable
mtcvtv23: command not found
mtcvtv23: käsku ei ole
mtcvtv23: không tìm thấy lệnh
mtcvtv23: komanda nerasta
mtcvtv23: Kommando nicht gefunden.
mtcvtv23: kommandot finns inte
mtcvtv23: komut yok
mtcvtv23: nie znaleziono polecenia
mtcvtv23: níor aimsíodh an t-ordú
mtcvtv23: no se encontró la orden
mtcvtv23: no s'ha trobat l'ordre
mtcvtv23: opdracht niet gevonden
mtcvtv23: parancs nem található
mtcvtv23: perintah tidak ditemukan
mtcvtv23: príkaz nenájdený
mtcvtv23: příkaz nenalezen
mtcvtv23: команда не найдена
mtcvtv23: командата не е открита
mtcvtv23: 命令找不到
mtcvtv23: コマンドが見つかりません