Macross was my first job assignment at Lucasfilm. They urgently wanted to replace the existing assembler they had been using. That one was written in Lisp — you wrote 6502 code in S-expressions, which looked amazingly weird. It was awesomely powerful, because you could use all of Lisp for a macro language, but it was also awesomely slow. It took about 45 minutes on our VAX 750 to assemble a 16K ROM cartridge game, mainly because doing this took 2 megabytes of RAM but the machine only had 512 kilobytes, so it page swapped horribly. My mission was to create a more conventional looking (and performing) assembler without sacrificing much of the macro programming power they had gotten addicted to, hence Macross.