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ASxxxx Cross Assemblers

ASxxxx Cross Assemblers, Version 2.00, August 1998

   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
under TSX+ and RT-11, PDOS C V5.4b, and Symantec C/C++ V6.1/V7.2
under  DOS/Windows  3.x/95.  Complete source code and documenta-
tion for the assemblers and linker is included with the  distri-
bution.   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.  


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

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