CAS: The Free Full-Featured 8051 AssemblerLocated at the FTP site csd4.csd.uwm.edu in /pub/8051/assem.This is a 1-pass assembler for the MCS-51 family of microprocessors with thefollowing features:         (1) Seperately assembleable files.             There are two stages of assembly:             (a) Pass 1: Creation of object files             (b) Pass 1 1/3: Linking of object files         (2) Relative addressing         (3) Unnamed segments         (4) Conditional assembly             With a C-like syntax, e.g.                if (Condition) {                   Assembly instructions...                } else {                   Assembly instructions...                }         (5) Multiple statements per line with C-like syntax.         (6) C-like expression syntax.         (7) Command-line options similar to those of the UNIX C compiler.             Compatible with UNIX's make.         (8) An extensive archive of real-life assembly language programs,             including a multi-tasking library.Plus, if you don't want to learn all the elaborate ins and outs of thistool right away, it is just as easy to use the first time out as anyminimal assembler.  Read the start-up notes for details.It has been tested and verified against all the software contained in the restof the 8051 archive.With enough demand and support, I may add in the following features infuture versions of this assembler:         (9) More compatibility between the 8051 disassembler and assembler.        (10) A powerful macro facility, to allow significant customizations             on the 8051 language.        (11) The ability to include "Pre-assembled" macros.This is probably the most elaborate 8051 assembler you will find anywherein the public domain.  It's yours with the source for free.Be on the lookout for future software developments...