I have never used external RAM before (beleive it or not :-o ) . Now I am using an NVRAM from Dallas so that in case of power failure the value of some variables is retained. My question is how do I declare the 'Non Volatile External' variable and how do I retreive the previous (pre-power fail) value ?
Review this thread: http://www.keil.com/forum/msgpage.asp?MsgID=4719 BTW: note that the Keil C51 xdata keyword is lowercase, and you need a space between the _at_ and the address value. (just typos in your post?) BTW2: note that applying bold seems to defeat the <pre> and </pre> tags - the font is no longer monospaced :-(