\xd5\xcd\x03\x800\x01v\x04\xfe.\xc0\x05x
Note that non-ascii characters in the above source code will be escaped (such as \x9f).
Disassemble:
ORG 00000H PUSH DE ;0000 D5 . CALL 08003H ;0001 CD 03 80 . . . JR NC,$+3 ;0004 30 01 0 . HALT ;0006 76 V INC B ;0007 04 . CP 02EH ;0008 FE 2E . . RET NZ ;000A C0 . DEC B ;000B 05 . LD A,B ;000C 78 X