

        ASxxxx Cross Assemblers, Version 4.00, November 2003 

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

        Operating System:  MS-DOS, Windows, Linux 
        or other supporting ANSII 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 AVR, PIC, Rabbit 2000/3000,
        DS8xCxxx,   z80(hd64180),    GameBoy(Z80),    MPS430,    H8/3xx,
        6800(6802/6808), 6801(hd6303), 6804, 6805, 68HC08, 6809, 68HC11,
        68HC12, 68HC16, 8051, 8085(8080), 6500,  1802,  740,  and  61860
        series  microprocessors.   Each  assembler 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  asso-
        ciated 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 S  record  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 Linux,
        DJGPP,  Cygwin,  Symantec  C/C++   V6.1/V7.2,   and   VC6   with
        MS-DOS/Windows  3.x/9x/NT/2000/XP.  Complete source code and do-
        cumentation for the assemblers and linker is included  with  the
        distribution.   Additionally,  test  code for each assembler and
        several microprocessor monitors ( ASSIST05 for the 6805,  MONDEB
        and ASSIST09 for the 6809, and BUFFALO 2.5 for the 6811) are in-
        cluded as working examples of use of these assemblers.  
