The 80 column chip itself was not very good, though. It lacked a raster interrupt (meaning you'd have to poll) and was full of bugs: http://commodore64.se/wiki/

The 80 column chip itself was not very good, though. It lacked a raster interrupt (meaning you'd have to poll) and was full of bugs: http://commodore64.se/wiki/index.php/Commodore_128_assembly_programming#80-column_mode http://commodore64.se/wiki/index.php/Commodore_128_assembly_...