A-0 System Hellow World Program Code

A-0 System is an early assembly language used on the UNIVAC I computer. Here is an example of a "Hello, World!" program in A-0 System:

LBL START

  OUT MSG

  HLT

LBL MSG

  TEXT 'HELLO, WORLD!'

  END

In this program, we define a label called START which serves as the entry point of the program. The OUT instruction is then used to output the message stored in the MSG label to the console. The HLT instruction is used to halt the program after the message is printed.

The MSG label defines a block of text using the TEXT instruction, which stores the message "HELLO, WORLD!".

Note that the A-0 System is an old and now outdated language, and it is unlikely to be used for modern programming. However, it is interesting to see how programming languages have evolved over time and how different languages and systems have been used throughout history.