\xf5\xcd\x03\x80\x040\xf9\xf1\xff\x10\xfcv
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H PUSH AF ;0000 F5 . CALL 08003H ;0001 CD 03 80 . . . INC B ;0004 04 . JR NC,$-5 ;0005 30 F9 0 . POP AF ;0007 F1 . RST 38H ;0008 FF . DJNZ $-2 ;0009 10 FC . . HALT ;000B 76 V