Here is a "Hello, World!" program written for an x86_64 Linux system using the [https://sourceware.org/binutils/docs/as/ GNU Assembler (gas/as)] syntax (which is the main assembler used in open source projects such as the Linux kernel, as well as the [[SPO600]] course), using Linux [[Syscalls]]:

Here is a "Hello, World!" similar program in x86 assembler for a Linux 32-bit x86 system, using the [http://www.nasm.us/xdoc/2.11/html/nasmdoc1.html#section-1.1 Nasm] syntax:

This is written in [https://sourceware.org/binutils/docs/as/ GNU Assembler (gas/as)] syntaxusing Linux [[Syscalls]]:

This is also in [https://sourceware.org/binutils/docs/as/ GNU Assembler (gas/as)] syntaxusing Linux [[Syscalls]]:

Here is the same "Hello World" program in [[6502]] assembler as used in the [[6502 Emulator]], using the [[6502_Emulator#ROM_Routines|ROM routines]] for output: