\xd5\xcd\x03\x800\x01v\xfe)(\x040\x04\x0c\x0c\x0d\x91\x81
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H PUSH DE ;0000 D5 . CALL 08003H ;0001 CD 03 80 . . . JR NC,$+3 ;0004 30 01 0 . HALT ;0006 76 V CP 029H ;0007 FE 29 . ) JR Z,$+6 ;0009 28 04 ( . JR NC,$+6 ;000B 30 04 0 . INC C ;000D 0C . INC C ;000E 0C . DEC C ;000F 0D . SUB C ;0010 91 . ADD A,C ;0011 81 .