At 23:48 2001-01-15, you wrote: >The RAM is divided into 64 pages of 4Kb, and each page has an "execution >forbidden" bit. Every time the CPU performs an instruction fetch from RAM, >the corresponding bit is tested. If the bit is set, the calculator >instantly crashes. ouch. I didn't know that. seems like it is time to update my knowledge. specially on hw2 calcs.... ///Olle