A86 is computer software, a compact commercial assembler developed for the Intel x86 family of microprocessors by Eric Isaacson, and sold initially as shareware in the 1980s. The assembler is contained in one 32 K executable and can directly produce a DOS compatible COM file or an object file for use with a standard linker. A86 uses a slightly simpler syntax for source code and requires no extensive use of directives as do contemporaries such as the Microsoft Macro Assembler (MASM). Isaacson claims that A86 can assemble 100,000 lines of source per second on a Pentium II or better. It comes with a debugger, D86.