Netwide Assembler by Simon Tatham, Julian Hall /code/utils/compiler/nasm094.zip	02 Jul 1997 (catalog date) 320,576 bytes
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A freeware assembler with good support. People have been switching from TASM to this assembler, especially linux and 68K coders. It is still being supported by the makers so it understands newer op codes, like mmx instructions, so you don't need to get intel's 'macros' for new opcodes.