CSE 109                 Spring 2008

   Specifications of the Simpletron Machine (taken from Deitel & Deitel,
   C++: How to program).

   Memory:   1000 locations, each containing a word consisting of a signed
             five digit integer

   A single Accumulator

   When a word is interpreted as an instruction, it must be positive,
   the first two digits must be one of the operations below, and the
   third, fourth, and fifth digits give the memory location to which the
   operation refers.

   Operations:

           10       Read from "input" to given memory location
           11       Write to "output" from given memory location
           20       Load data from given memory location into accumulator
           21       Store contents of accumulator into given memory location
           30       Add contents of given memory location to accumulator
           31       Subtract contents of given memory location from
                    accumulator
           32       Divide accumulator by contents of given memory location
           33       Multiply accumulator by contents of given memory location
           40       Branch to given memory location
           41       Branch to given memory location if accumulator is negative
           42       Branch to given memory location if accumulator is zero
           43       Halt execution

    USING MY EMULATOR OF THE SIMPLETRON

    The emulator is located in the file:
               /proj/csc109/bin/sml

    The call to the file takes the form
          sml <input> <output>  [-v]
    where <input> is the input file, <output> is the output file containing
    the results of running sml, and -v is an optional command that leads
    to more verbose output, both to the screen and to the output file.

    The input file for sml should consist of lines of code, followed by END,
    followed, possibly, by lines of input data.  Each line of code or data
    should contain an integer of up to 5 digits. Anything on a line after the
    integer is ignored.  Here is a very simple program (it reads and displays
    6).

    10005
    11005
    43000
    END
    6