 IBM's Monochrome Display Adapter and Enhanced Graphics Adapter as well as the Hercules Graphics Card and the original Macintosh computer generated video signals of 342 to 350p, at 50 to 60 Hz, with approximately 16MHz of bandwidth, some enhanced PC clones such as the AT&T 6300 (aka Olivetti M24) as well as computers made for the Japanese home market managed 400p instead at around 24MHz, and the Atari ST pushed that to 71Hz with 32MHz bandwidth - all of which required dedicated high-frequency (and usually single-mode, i.e.not "video"-compatible) monitors due to their increased line rates.The Commodore Amiga instead created a true interlaced 480i60/576i50 RGB signal at broadcast video rates (and with a 7 or 14MHz bandwidth), suitable for NTSC/PAL encoding (where it was smoothly decimated to 3.5~4.5MHz).