MGMT 1030 Lecture Notes - Lecture 5: Calculator
6 May 2018
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MGMT 1030 Tutorial 5 Notes – Operation of the LMC
Introduction
• Next, there is a calculator basically a simple pocket calculator.
• The calculator can be used to enter and temporarily hold numbers, and also to add and
subtract.
• The display on the calculator is three digits wide.
• At least for the purposes of this discussion, there is no provision made for negative
numbers or for numbers larger than three digits.
• As you are already aware, ’s opleet aritheti ould e used for this purpose,
but that is not of interest here.
• Third, there is a two-digit hand counter, the type that you click to increment the count.
• The reset button for the hand counter is located outside the mailroom.
• We will call this counter an instruction location counter.
• Finally, there is the Little Man.
• It will be his role to perform certain tasks that will be defined shortly.
• Other than the reset switch on the hand counter, the only interaction between the Little
Man Computer and the outside environment are an in basket and an out basket.
• A user outside of the mailroom can communicate with the Little Man in the mail room
by putting a slip of paper with a three-digit number on it into the in basket, to be read
by the Little Man at the appropriate time.
• Similarly, the Little Man can write a three-digit number on a slip of paper and leave it in
the out basket, where it can be retrieved by the user.
• Note that all communication between the Little Man Computer and the outside world
takes place using three-digit numbers.
• Except for the reset button on the instruction location counter, no other form of
communication is possible.
• The same is true within the mailroom
• All instructions to the Little Man must be conveyed as three-digit numbers.
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