I know enough #Commodore #GEOS programming now that I can throw together a quick test program from scratch in less than an hour, with only stupid spelling mistakes.
TIL geoAssembler can't take a data file arg via GetFile, which means throwing together a quick test program is still 15-30 minutes of clicking & waiting, even with an (emulated) REU.
I'm sorely tempted to make my first serious program a dangerously ambitious IDE. Maybe like geoCOPE, but with CBM SEQ source files.