\xcd\x03\x80\xd8\x0f\xcb\x11\x10\xfby\xff\xc7v
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 . . . RET C ;0003 D8 . RRCA ;0004 0F . RL C ;0005 CB 11 . . DJNZ $-3 ;0007 10 FB . . LD A,C ;0009 79 Y RST 38H ;000A FF . RST 0 ;000B C7 . HALT ;000C 76 V