This may not be entirely Keil but I have banged all the LPC2000 forums I can find but no info on this problem. Using Keil MDK ver 3.20. We are using the LPC2378 in the standard byte write and byte read mode for external memory I/O. Byte read works fine. In byte write we get no WE\ strobe. PINSEL9 is set to 0x50055000 which sets bits 18 and 19 to the second alternate mode for WE\. No strobes. Looking at the code generated, a full word is loaded with four bytes. No strobe. In the BLS mode(third alternate) we get strobes on the same pinout as per the manual. But we get the four byte lane strobes. We are attempting to use the EMC for memory mapped I/O but the four strobes kill us. Waits, etc. are in the default reset settings. EMC is enabled because we can read with no problems. Earlier setps of this chip had EMC problems but according to the local NXP, it was corrected in step A and our chip is step B. Has anyone else suffered this problem? Nothing too fast on the bus so we can go to GPIO for the bus control but would sure like to use the chip features. Any suggestions appreciated. Have been trying to get info from NXP since last week. No joy there. Bradford