\xcd\x03\x80\x15\x12\xfe \xf7\xcd\x03\x80\xd8\xfe_ \xf7%~\xcfv
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 . . . DEC D ;0003 15 . LD (DE),A ;0004 12 . CP 00AH ;0005 FE 0A . . JR NZ,$-7 ;0007 20 F7 . CALL 08003H ;0009 CD 03 80 . . . RET C ;000C D8 . CP 05FH ;000D FE 5F . _ JR NZ,$-7 ;000F 20 F7 . DEC H ;0011 25 % LD A,(HL) ;0012 7E ~ RST 8 ;0013 CF . HALT ;0014 76 V