Kindly also prove me source code (TASM) and pin assignments...

Source code no, help and hints yes.

TASM, if I recall is for the PC and thus no answer will be found here in a '51 forum.

If another TASM exist which is for the '51, you need to specify which serial EEPROM you intend to use since the protocols differ.

Pin assignments: WS: as you like it

Erik