write the word "chipram" in chipram where VIC-IV starts looking
for screen ram on power up to help with debugging via simulation.
try to get program to terminate when simulation fails. doesn't work.
fix bugs with writing data to screen ram buffer.
fix fetch address bugs with screen ram buffer.
fix first character of line bug.
set default colour to $07 (yellow) to help debugging.
fix reversed RGB values in palette: now draws with C64-like palette.
add some different colours to start of colour ram to aid debugging.
work on end of chargen handling. still imperfect.
flatten logic when starting chargen fetch.