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First code used to Develope Operating system

 The first operating system (OS) code can be traced back to the 1950s, specifically to IBM's General Motors Operating System (GMOS), which was developed in 1956 for the IBM 704 mainframe. However, it was not written in modern programming languages like C or Python but in assembly language, as higher-level programming languages were not yet common.

Assembly Example (Simplified)

START:
    LOAD JOB_QUEUE ; Load the queue of tasks to be processed
    CHECK_MEMORY ; Verify memory allocation for the job
    IF MEMORY_FULL, HALT ; Stop if insufficient memory
    LOAD JOB ; Load the next job into the CPU
    EXECUTE ; Execute the job
    STORE RESULTS ; Save the results back to memory
    RETURN_TO_QUEUE ; Return to the job queue for the next task
    LOOP START ; Repeat the process

Pseudocode for the First OS (GMOS-style)

START_OS:
    Initialize hardware resources
    Initialize memory manager
    Load job queue from input devices (e.g., punched cards)
    Display "System Ready"

MAIN_LOOP:
    While (job queue is not empty):
        Load next job from the job queue
        Check job requirements:
            If (insufficient memory or CPU resources):
                Move job to waiting queue
                Continue to next job
        Allocate memory for the job
        Load job into CPU
        Execute job:
            While (job is not complete):
                Perform task
                Handle I/O operations
                Check for system interrupts
        Store job results to output device
        Deallocate memory for the job
    End While

SHUTDOWN_OS:
    Display "No more jobs in the queue"
    Release all hardware resources
    Power down the system

First Program (Pseudocode)

START_PROGRAM:
    Display "Job Started"

    Load input data from the device (e.g., punched cards)
    Perform arithmetic operations (e.g., Add two numbers)
        A = Input1
        B = Input2
        RESULT = A + B
    Save the result to the output device (e.g., tape or printer)

    Display "Job Completed"
    Return to OS for the next task


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