Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. A86 is a compact commercial assembler developed for the Intel x86 family of microprocessors by Eric Isaacson. The assembler can directly produce a Windows/DOS compatible .COM or .OBJ files from a simple text source file. It uses a slightly simpler syntax for source code than that used by other assemblers, and it is optimized for maximum speed at both assembly and run times. It comes with a debugger, D86.A86/D86 target 16-bit x86 platforms. The companion products A386 and D386 are designed for 32-bit platforms.The A86 assembler was the first programming tool to automatically embed a "signature" into the code which it generated. Through its choice of instructions (many of which are functionally equivalent), it was possible to distinguish between registered and unregistered versions of the assembler, although access to the source code was required.

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