% \xcd\x03\x80\xb7 \xff\x02\x10\xf6%\xb6 \xf2v
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H DEC H ;0000 25 % LD A,(BC) ;0001 0A . CALL 08003H ;0002 CD 03 80 . . . OR A ;0005 B7 . JR NZ,$+1 ;0006 20 FF . LD (BC),A ;0008 02 . DJNZ $-8 ;0009 10 F6 . . DEC H ;000B 25 % OR (HL) ;000C B6 . JR NZ,$-12 ;000D 20 F2 . HALT ;000F 76 V