> Some people sometimes confuse the VAX with the PDP-11, because the VAX was > an upgrade of the PDP-11 architecture. Though, to be honest, I still think > that the PDP-11 has the cleanest assembly language of any machine I've > used. I agree! It was amazing how things worked out when you started mixing various modes and registers to get immediate addressing, indirect addressing, etc. As I recall, the instruction word was always something like this: Operation - Source Register - Source Mode - Destination Register - Destination Mode How you mixed those created tha magic. Harold -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist