Firstgeneration languages machine code

The first generation of digital computers that were built in the late-1940s used program code that was written in binary - sequences of 1s and 0s, or BITs (Binary digiTs). This was known as machine code. It was very difficult to understand and the programmer needed to have a great deal of knowledge about the hardware of the system in order to write programs. Even something which seems quite simple, such as transferring a byte of data from memory to a register (temporary storage on the CPU) took a great deal of effort. This low-level programming was very time-consuming, easy for the programmer to make mistakes, and it was very difficult to understand the code and required very many low-level instructions to carry out even the simplest of operations.

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