80 columns were pretty much a requirement for CP/M though, which was basically the MS-DOS of the 8-bit era (for instance the Amstrad CPC had an 80 column mode a

80 columns were pretty much a requirement for CP/M though, which was basically the MS-DOS of the 8-bit era (for instance the Amstrad CPC had an 80 column mode and supported CP/M as optional operating system, and the Commodore 128 also added 80 column support because the whole point of the additional Z80 CPU in the C128 was proper CP/M support).