TRS-80 Manual: Microsoft Editor Assembler-Plus (1979)(Microsoft) : Free Download, Borrow, and Streaming : Internet Archive

Pretty sure I remember plunking down hard-earned lawn-mowing money for this software, back in the day. Before that, I had done all my machine-language programming by hand-assembling opcodes with pencil and paper. This was a huge step up for me (macros!), and I still have fond memories. (Of course… I never actually wrote a complete program with it. :/ )

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