ORL iram addr,#data

by using the ORL istruction you can SET any bit in any iram byte address 0x00 - 0xFF range.
the #data should be an ace '1' to the desired position.
eg:
Save This Code ORL 34h, #0b01000000
1) the above code is wrong for addresses 80-ff which is not stated
2) IRAM is the standard name for for addresses 80-ff for which the code example does not work
3) why even do these explanations, it is far better documented in "the bible" chapter 2

Erik

here are the links to "the bible"
Chapter 1 - 80C51 Family Architecture:
http://www.nxp.com/acrobat_d...ARCH_1.pdf

Chapter 2 - 80C51 Family Programmer’s Guide and Instruction Set:
http://www.nxp.com/acrobat_d...UIDE_1.pdf

Chapter 3 - 80C51 Family Hardware Description:
http://www.nxp.com/acrobat_d...WARE_1.pdf