\xcd\x03\x800\x01v\xc5<o\x87\x87\x87\x95
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 . . . JR NC,$+3 ;0003 30 01 0 . HALT ;0005 76 V PUSH BC ;0006 C5 . INC A ;0007 3C < LD L,A ;0008 6F O ADD A,A ;0009 87 . ADD A,A ;000A 87 . ADD A,A ;000B 87 . SUB L ;000C 95 .