I use the MPASM windows help file comes as part of the full MPLAB installation. >From the help menu in MPLAB, select MPASM help. About Chapter 5 is the "directive language" help, which is what you are looking for. I've found it to be adequate for my needs. Hope this is what you're looking for, Andy -----Original Message----- From: Moser, Carl Woodrow, JR (Carl) [mailto:cwmoser@LUCENT.COM] Sent: 09 February 2000 13:10 To: PICLIST@MITVMA.MIT.EDU Subject: PIC Assembler directives ... I've notice a lot of variation in the "syntax" of a number of posts here with Assembly Language code, and have run into difficulties with some assembler directives (such as data, code, ds,etc) when using the MPLAB assembler. Via trial and error I got cblock and cend to work to define my read/write storage (GPR), but now I want more information on usage of the MPLAB assembler. I've downloaded the MPLAB documentation but where can I find information on various MPLAB assembler directives such as cblock, and all the others?