Programs for the 'Little Man Computer' (LMC)

LMC.md

The Little Man Computer (LMC)

Information about the LMC can be found at these links:

Wikipedia: https://en.wikipedia.org/wiki/Little_man_computer
Peter Higginson: https://peterhigginson.co.uk/LMC/help.html
Futurelearn: https://www.futurelearn.com/courses/how-computers-work/0/steps/49285
101 Computing: https://www.101computing.net/fibonacci-sequence-using-lmc/

Video tutorials:

Andy Dolinski: https://www.youtube.com/watch?v=kCyyZI1GgsQ and https://www.youtube.com/watch?v=sEFnRDgkaWA

LMC emulators/simulators are available here:

101 Computing: https://www.101computing.net/lmc-simulator/
Peter Higginson: https://peterhigginson.co.uk/LMC/ (this is the one which I used)

LMC programs which I have written for the 'Higginson' LMC:

Program00:

        LDA 99  
        ADD 98  
        OUT  
        HLT  
// Output the sum of the contents of memory addresses 99 and 98

Program01:

        LDA label1  
        ADD label2  
        OUT  
        HLT  
label1  DAT 15  
label2  DAT 34  
// Output the sum of the values at label1 and label2 (i.e. 15 and 34 respectively)  

Program02:

        INP
        SUB label1
        BRP ifgre
        LDA zero
        OUT 
        HLT
ifgre   LDA one
        OUT
        HLT
label1  DAT 34
one     DAT 1
zero    DAT 0
// Output a 1 if the entered value is greater than or equal to 34, 0 otherwise

Program03:

        INP
        STA firstn
        INP
        ADD firstn
        SUB label1
        BRP ifgre
        LDA zero
        OUT 
        HLT
ifgre   LDA one
        OUT
        HLT
label1  DAT 34
firstn  DAT
one     DAT 1
zero    DAT 0
// Output a 1 if the two entered values sum to be greater than or equal to 34, 0 otherwise

Program04:

        INP
        STA firstn
        INP
        SUB firstn
        OUT // O/P result
        SUB thresh 
        BRP ifgre
        LDA false
        BRA exit
ifgre   LDA true // If>34
exit    OTC
        HLT
thresh  DAT 34
firstn  DAT
true    DAT 84
false   DAT 70
// Subtract the first input number from the second, and output the result. Then output a T if the result is >=thresh(34), F otherwise

Program05:

        INP
        BRP wrt
        LDA false //write F
        OTC
        HLT
wrt     LDA true //write T
        OTC 
        HLT
true    DAT 084
false   DAT 070
// Read the input. Write T to output if the input is non-negative, F otherwise

Ideas for further programs to write:

• Take a user input and count it down to zero (outputting each number in the count)
• Do integer division
• Square an input number
• Calculate Fibonacci series to the input number of terms
• Some of the LMC challenges from: https://www.101computing.net/category/lmc/ or https://www.101computing.net/little-man-computer-mini-challenges/
• Some of the challenges listed here: https://teachcomputerscience.com/little-man-computer/

can i get a program for multiplying three number? kindly.

can i get a program for:
Ask the user to input two numbers. If the first number is greater than the second, output 1; if the second number is greater than the first, output -1, and if the two numbers are the same, output 0.