$ cat d8.a; echo; python ada8.py d8.a
    nop
    nop
    nop

start:
    ldib 0x0
    stab ledloc
    ldib 0xff
    stab ledloc
    jmp start

ledloc = 0xabc

0000: 0000 0000 0000 0100 babc 01ff babc 1003
$ (echo 'ttr'; echo 'jmp 0') | python ada8.py
/dev/stdin:2: Could not assemble jmp at 1 due to xtx at 0
$ echo 'ldib 0x100' | python ada8.py
/dev/stdin:1: Operand out of range (256)