\xaf\x01 \xa9O\xcd\x03\x800\x01v\xb8 \xf5y\xffx\xe5
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H XOR A ;0000 AF . LD BC,00A20H ;0001 01 20 0A . . XOR C ;0004 A9 . LD C,A ;0005 4F O CALL 08003H ;0006 CD 03 80 . . . JR NC,$+3 ;0009 30 01 0 . HALT ;000B 76 V CP B ;000C B8 . JR NZ,$-9 ;000D 20 F5 . LD A,C ;000F 79 Y RST 38H ;0010 FF . LD A,B ;0011 78 X PUSH HL ;0012 E5 .