## ASxxxx Cross Assemblers

####

    ASxxxx Cross Assemblers, Version 2.30, April 2000

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

    Operating System: TSX+, RT-11, MS-DOS, Windows 3.x/95/98, DJGPP,
    Linux 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,  68HC11,  68HC12,   68HC16,   8051,
    8085(8080),  z80(hd64180),  H8/3xx, and 6500 series microproces-
    sors.  Each  assembler  has  a  device  specific  section  which
    includes:   (1)  device description, byte order, and file exten-
    sion 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 with
    TSX+ and RT-11, GCC 2.7.2 with LINUX, Symantec C/C++  V6.1/V7.2,
    DJGPP(GCC 2.8.1)and VC6 with MS-DOS/Windows 3.x/95/98.  Complete
    source code and documentation 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 included as working examples of use  of  these
    assemblers.

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