[{"_1":2,"_42":-5,"_43":-5},"loaderData",{"_3":4,"_10":11,"_40":-5,"_41":-5},"root",{"_5":-5,"_6":-5,"_7":-5,"_8":9},"user","shoppingCartId","toast","locale","en","routes/_store+/_readers+/email_author.$slug/route",{"_12":13,"_39":-5},"book",{"_14":15,"_16":17,"_18":19,"_20":21,"_22":23,"_24":25},"id","Z2lkOi8vbGVhbnB1Yi9TdG9yZTo6Qm9va1Byb2R1Y3QvNjc5NTU","title","Assembly Arithmetic Algorithms-DOS","state","published","contactAuthorMethod","email","aboutText","

You might be surprised to find a book in the 21st century about programming in Assembly Language on DOS.

First, let me introduce this book by telling you what I will teach you. By the end of this book, you will have enough information to write any text based console program in the form of a 16-bit DOS (Disk Operating System) \".com\" file.

The \".com\" file was a format used by all version of MS-DOS, and even supported on Windows up to XP. It has no header information and is limited to 64 kilobytes of memory. Rather than viewing the limitation as a weakness, I view it as a strength because it forces me to be a better programmer and squeeze the most out of every byte.

To get the most out of this book, some background on the Binary and Hexadecimal numeral systems is going to be helpful, but this is not strictly required because I will be providing functions you can use in your code that will convert between decimal (base ten), binary (base two), and hexadecimal (base 16).

However, I would say that experience in at least one programming language is necessary for an understanding of terminology like \"arrays\", \"pointers\", \"addresses\", \"integers\", \"floating point\", etc. I recommend the C Programming Language as a start. C++ is also a good starting language but tends to abstract details away that directly apply to Assembly Language, which is the lowest level a human can go for understanding a computer.

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