Hi, In my 8051 code space I have an 8 byte gap starting at 0x0003. The hex file generated by OH51 does not write anything to this area however hex2bin always fills it with 0x00 irrespective of the pad byte specified. If I specify a binary file size greater than the code size hex2bin correctly fills this with the specified pad byte. Does anyone know how to get hex2bin to fill this gap correctly? I am using v1.06 downloaded from the Keil website this morning. Thanks.