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        ASxxxx Cross Assemblers, Version 1.7, November 1995 

        Submitted by Alan R.  Baldwin, 
        Kent State University, Kent, Ohio 

        Operating System:  TSX+, RT-11, MS/DOS, PDOS 
        or other supporting K&R C.  

        Source Langauge:  C 

        Abstract:  

           The  ASxxxx  assemblers are a series of microprocessor assem-
        blers written in the C programming  language.   This  collection
        contains cross assemblers for the 6800(6802/6808), 6801(hd6303),
        6804,   6805,   68HC08,   6809,   6811,   68HC16,    8085(8080),
        z80(hd64180), H8/3xx, and 6500 series microprocessors.  Each as-
        sembler has a  device  specific  section  which  includes:   (1)
        device  description, byte order, and file extension information,
        (2) a table of assembler general directives, special directives,
        assembler  mnemonics and associated operation codes, (3) machine
        specific code for processing the  device  mnemonics,  addressing
        modes, and special directives.  

           The assemblers have a common device independent section which
        handles the details of file input/output, symbol  table  genera-
        tion,  program/data  areas,  expression  analysis, and assembler
        directive processing.  

           The  assemblers  provide  the following features:  (1) alpha-
        betized, formatted symbol table listings, (2) relocatable object
        modules, (3) global symbols for linking object modules, (4) con-
        ditional assembly directives, (5) reusable  local  symbols,  and
        (6) include-file processing.  

           The  companion program ASLINK is a relocating linker perform-
        ing the following functions:  (1) bind multiple  object  modules
        into  a  single  memory  image,  (2) resolve inter-module symbol
        references,  (3)  resolve  undefined  symbols   from   specified
        librarys of object modules, (4) process absolute, relative, con-
        catenated, and overlay attributes in data and program  sections,
        (5)  perform  byte and word program-counter relative (pc or pcr)
        addressing calculations, (6) define absolute  symbol  values  at
        link  time, (7) define absolute area base address values at link
        time, (8) produce Intel Hex or Motorola  S19  output  file,  (9)
        produce  a  map  of the linked memory image, and (10) update the
        ASxxxx assembler listing files  with  the  absolute  linked  ad-
        dresses and data.  

           The  assemblers  and  linker  have  been tested using DECUS C
        under TSX+ and RT-11, PDOS C V5.4b, and Symantec C/C++ V6.1/V7.0
        under  DOS/Windows  3.x.  Complete source code and documentation
        for the assemblers and linker is included with the distribution.
        Additionally, test code for each assembler and several micropro-
        cessor monitors ( ASSIST05 for the 6805, MONDEB and ASSIST09 for
        the  6809, and BUFFALO 2.5 for the 6811) are included as working
        examples of use of these assemblers.