Lpc2000

Hello to everybody 
I am using IAP to program the FLASH memory ,to store permanently some 
data, as I have not included EEPROM in my target board.So my 
application itself is programming the FLASH to recall some data
during next power ON. 
I am using the assembler-code which I found in the user manual 
LPC901..... It runs very well in my software-simulator in Keils 
µVision3. When I am using Keils EPM900-Emulatorboard it also runs 
good. When I use it on Chip, I always read different numbers from the 
same address. 
H E L P me please. Is here anybody who can help me, to program some 
code, which runs on chip and in the emulator? 
How about this: Write #89H into code:0801H -- than read from 0801H
and store in ACC 
It would be nice to hear from anybody Best Regards Frank