I'm new in microcode, so the question may be foolish, but I can't find answer searching forum. I'm using very old AVR ISP with AT89S53 chip. I tried uVision, but found that HEX file produced, can't be loaded in ISP. It says FILE LARGER THAN DEVICE. I have looked for some memory settings and others and couldn't solve that. Eventually I found that Old version of uVision 1.24 with BL51 NOOL command line option produces correct file. I can't get the same from new version and I don't understand the reason it cause.
"I feel I need to read more about linker and simulator. Can you advise me something downloadable?" Yes - see the Standard Advice that I mentioned earlier: http://www.keil.com/forum/docs/thread4198.asp