\x04\xcd\x03\x800\x01v\xe60 \x03G> \x80\xe5
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H INC B ;0000 04 . CALL 08003H ;0001 CD 03 80 . . . JR NC,$+3 ;0004 30 01 0 . HALT ;0006 76 V AND 030H ;0007 E6 30 . 0 JR NZ,$+5 ;0009 20 03 . LD B,A ;000B 47 G LD A,00AH ;000C 3E 0A > . ADD A,B ;000E 80 . PUSH HL ;000F E5 .