@NanoWar: Back in the day, everyone used AsmGuru! It was THE tutorial for learning asm. When someone asked "How do i learn asm?" the response was always "AsmGuru!" There was also IonGuru and a couple others that came out with ion, but didn't cover as much stuff as AsmGuru, basically just the new ion routines (which was really helpful back then, too). I also never understood that lesson, but honestly never really paid much attention to it as by the time i started trying to write programs with sprites i just used the ion sprite routines

Later, a few folks (and eventually, everyone else) criticized AsmGuru for focusing too much on bcalls and fancy text things (the flags) and not so much on actual z80 coding/design.
CoBB's tutorial as far as i know was the first (in the TI community) to try to really focus on that, on things like multiplication/division, tables, the structure of a program, and less TI-specific z80 stuff, and was a direct response (if i recall correctly) to all the praise AsmGuru got. That was in... like... 2003/2004. Now there's the 28 days tutorial, which seems to be the "AsmGuru" of today, though now also has its critics.
Sorry, contra, as none of this is really related to your project, sometimes i like to reminisce a little too much
