\xcd\x03\x80\xff\xfe9 \xf8v
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H CALL 08003H ;0000 CD 03 80 . . . RST 38H ;0003 FF . CP 039H ;0004 FE 39 . 9 JR NZ,$-6 ;0006 20 F8 . HALT ;0008 76 V