I think 40 chars in 25 lines where standard, when I did my first steps on the first common desktop computer generations 30 years ago.
in reply to Re^3: Perl 80 Chars perl line Rule
in thread Perl 80 Chars perl line Rule
IIRC some computers like Apple II and/or CBM 4000 could be run with half width characters to achieve 80 chars/line.
PS: God bless my mum for allowing her nerd kid to book evening classes at an "adult education center" to play with "Komputer"s to learn science fiction technologies like BASIC and ASSEMBLER... =)