>\xf4\xb8 \x01v\x04>!
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H LD A,0F4H ;0000 3E F4 > . CP B ;0002 B8 . JR NZ,$+3 ;0003 20 01 . HALT ;0005 76 V INC B ;0006 04 . LD A,021H ;0007 3E 21 > !