ASM -  8085 Assembler for the Model 100
               From
         Micro Demon, Inc.
         P.O. Box 50162
         Columbia, SC 29250
         Phone:803-733-0980
         CIS 75515,1507
   
ASM is a professional 8085 assembler
from Micro Demon. It supports the
features  that you expect in an
assembler, and much more! First of all,
ASM is compact and FAST. it only
requires 3.6K of your model 100's
memory, and it can assemble a 15K
source file in less than 20 seconds.
ASM is written entirely in machine
language, but comes with a one-line
BASIC interface that makes it very easy
to load and run. ASM produces an object
file (.CO extension) directly from the
source file. It does NOT just poke the 
code into memory.

   ------------------------------

 But ASM is more than just fast. It
also contains a myriad of features to
make your machine language programming
both easier and more efficient. For
instance 
             -----

 **1 All arithmetic expressions are
allowed in labels. You can use +,*,
-,^,MOD,AND,OR,NOT,XOR, and the use of
parenthesis. Negative 8, and 16 bit
constants are allowed.

 **2 As an end of assembly option, ASM
will supply you with a listing of the
value of each label used in your
program, along with the number of times
it was accessed. You can have the
values printed in decimal or
hexadecimal. 

**3. You can have multiple statements  
   on a line. For example,
      inx h:inx d:dcr b:jnz loop
  is legal code. Commas are optional.
You may write lxi h 23000 or
 lxi h,23000

 **4.Source files can use any mixture
of upper and lower-case characers.    
upper- and lower-case only matters    
for labels.
 
 **5.ASM supports, of course, all the
 standard pseudo-ops, and in full    
generality. What's more if you     
don't like the mnemonics used, you    
can change them to suit your whims! The
only restriction is that you must use
the same length for your new mnemonics.
as that used by the old ones 

**6.dfb (define bytes), and dfw (define
    word) can both define a whole list 
   of data. For instance,
  dfw 23,LABEL,$FA34,%10010,12600,$A4D
is ok. Note that hex, decimal, and 
label values can all be intermixed.    
(The $ prefix denotes hex constants,
and % denotes binary constants.)
        
**7.You can use any mixture of hex and 
   decimal, and binary values in your
source files. You can also have the
output listed in either hex or decimal.
             
**8.You can have any portion of the    
assembled output listed to the    
display. The output will be routed    
to the printer automatically if the    
printer is on and connected to the    
model 100.              

**9.The following examples will show   
 you some of the data statements    
allowed by ASM.
    mvi a,23   ;Load A with decimal 23 
    mvi a,$fa  ;Load A with hex FA     
    cpi 'X     ;compare A with 88,     
               ;the ASCII value for X  
    mvi c,>63000 ;Load C with the high 
               ;byte of 63000    
    ani <book  ;AND A with the low     
               ;byte of label BOOK     

    lda 2*(box+car)/5 ;Load A from the
                      ;computed address
    ori %10010101   ;OR A with 149 
                    ;binary 10010101

**10.The asc (or dfm) mnemonic can be   

 used to generate a string of ASCII    
characters for messages and other    
purposes. Thus,
        asc This is a message!       
will put the corresponding bytes of    
   "This is a message!" into the    
appropriate part of the object file.   
  All printable characters are legal   
 in an asc expresion.                  
 
Full Error Checking 

**11. ASM checks carefully for all
standard errors, and in case an error
is detected, ASM will display an error
message along with the line in which
the error occured, and with the error
in inverse video.

**12.Labels can be up to six characters 
long and can either denote the address
of a line or be defined by an
EQU (equate) pseudo-op. ASM checks for
repeated labels and will inform you if
you slipped up and used the same label
twice. When the assembly is complete,
you can have ASM list the labels and
their values in hex or decimal Labels
must be preceeded by a period.
               ----- 

**13. You may reserve a specified
number of bytes by using the ds
directive
      Thus ds 90 will reserve 90 bytes 
of memory for a table, list or     
other data structure. Also you can     
specify the contents of the bytes     
reserved by ds. If you use just
    ds 60
 ASM will reserve 60 bytes, and will
place a zero in each one.  If you use
instead,
          ds 60,32
   ASM will reserve 60 bytes, but will
fill each one with a blank character 
(ASCII 32). The fill byte can be any
byte value.              

**14. The EXEC pseudo-op allows you to 
assign an execution address to the 
object file created by ASM. If you do
not include EXEC, then there will be no
execution address. If you use EXEC on a
line by itself the origin will be the
execution address. If you use
     EXEC 62000
  Then 62000 will be the execution     
address for the object file.           

             Macros!  
     
**15. While ASM is not a macro 
assembler, it does contain several built
-in macros that simplify writing source 
code. For example
XBD   - Exchages the B and D registers
PUSHA - Pushes all the registers        
        onto the stack.      
POPA  - Pops the registers in then      
        reverse order of PUSHA.
ILHL -  Indirectly load the HL register
        pair.
DUMP -  Pops the stack without
        affecting any reisters
DISP -  Displays a message. For example
        DISP NOTE will print the
        message stored at NOTE.     
PRHL -  Prints the 16-bit integer
        stored in HL.
GET  -  Scans the keyboard and gets a
        character of input     
NEGA -  Negates the accumulator
     AND More!     


**16. Relative Branch Instructions!    
  Included among the macros are a     
collection of relative branch
instructions intended for use in
programs that must interface with a
BASIC program, and should ideally be
reloacteable. These are lengthy and
slower than a simple jump, but they can
be used to produce relocateable code.  
  
 COMPLETE DOCUMENTATION and ROM 
Information 

**17. ASM comes with a through manual  
   that not only explains ASM, but     
provides much useful information     
about the ROM also.  In addition, ASM
comes with three example source files,
including a program that will allow you
to trace the operation of your BASIC
programs.

  -----------------------------------

 ASM sells for only $69.95 and is  
available from

            Micro Demon, Inc
            P.O. Box 50162
            Columbia, SC 29250
                              
  Or call 803-733-0980 (24 hrs a day)
Or leave a mesage to David Sumner or
Micro Demon 75515,1507 on this SIG.