thanks


What do you mean "different" ???

garbage (no pattern detected)


Do you write to 29c256 using code running on rom emulator ?

No.

the program is running in the 8051, so Reading and Writing to 29c256 is controlled by 8051.
the code in the 29c256 is not used for running of system, Only used for my test, the source of the copy.


Writing by Rom emulator is using the Hex file made by keil. and the Rom emulator is connected to My PC.