sdldz80: 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/sdldz80 - from package: sdcc

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

Error in other languages:
sdldz80: bevel nie gevind nie
sdldz80: comandă negăsită
sdldz80: comando não encontrado
sdldz80: commande introuvable
sdldz80: command not found
sdldz80: käsku ei ole
sdldz80: không tìm thấy lệnh
sdldz80: komanda nerasta
sdldz80: Kommando nicht gefunden.
sdldz80: kommandot finns inte
sdldz80: komut yok
sdldz80: nie znaleziono polecenia
sdldz80: níor aimsíodh an t-ordú
sdldz80: no se encontró la orden
sdldz80: no s'ha trobat l'ordre
sdldz80: opdracht niet gevonden
sdldz80: parancs nem található
sdldz80: perintah tidak ditemukan
sdldz80: príkaz nenájdený
sdldz80: příkaz nenalezen
sdldz80: команда не найдена
sdldz80: командата не е открита
sdldz80: 命令找不到
sdldz80: コマンドが見つかりません