\xcd\x03\x80\x1f>@.\x13\x06\x1a<8\x02~#\xff\x10\xf8vHello World!
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 . . . RRA ;0003 1F . LD A,040H ;0004 3E 40 > @ LD L,013H ;0006 2E 13 . . LD B,01AH ;0008 06 1A . . INC A ;000A 3C < JR C,$+4 ;000B 38 02 8 . LD A,(HL) ;000D 7E ~ INC HL ;000E 23 # RST 38H ;000F FF . DJNZ $-6 ;0010 10 F8 . . HALT ;0012 76 V LD C,B ;0013 48 H LD H,L ;0014 65 E LD L,H ;0015 6C L LD L,H ;0016 6C L LD L,A ;0017 6F O JR NZ,$+89 ;0018 20 57 W LD L,A ;001A 6F O LD (HL),D ;001B 72 R LD L,H ;001C 6C L LD H,H ;001D 64 D DEFB 021H ;001E 21 !