A86 and D86

The best (and only) shareware assembler is A86. It is freely available and is perfectly adequate for everything in this tutorial. The only thing it lacks is the ability to write programs for 386 and above processors, which must be registered for. I highly recommend it for anyone beginning to learn assembly language.
Download A86

There is also a debugger for A86, called D86, which I also would recommend. It is especially useful for beginners, as it allows instructions to be entered and their effect on the registers etc can be seen immediately. It requires A86 to run.
Download D86

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