Quote:
Originally Posted by JSWolf
Sony's eBook format was also rubbish when they launched the PRS-500.
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Yes, typical Sony, though unlike mobi, their own idea. But they adopted epub. But Sony had an ereader before the 2005 einik (Kindle 2007, but Amazon always also sold for apps before and after Kindle). Sony had ebooks at least since 1991, eight years before public release of OEBPS (which is epub 1.0, but never called that).
Years before solid state storage was viable for ebooks:
https://en.wikipedia.org/wiki/Data_Discman Seems to have used mini-CD rather than minidisc (which could be pressed discs or Magneto-Optic and came out in 1992).
They also had a full size CD version a year later.
So Sony have some excuse for LRF on the 2005/2006 PRS-500, but did adopt epub in 2010 and it was available as a "return to Sony" upgrade on 2009 models.
Amazon didn't introduce the azw3 (similar to epub) version till 2011!, though they also much later added it to FW updates for all earlier models except K1, K2, DX and DXG, because original mobi/azw is so abysmal. DRM also would have been a motivation. I read somewhere that though the DXG came out slightly after the K3 aka KK3, that it never got azw3 due to lack of RAM, being basically little more than a screen upgrade of the DX, which is similar to K2, except with a bigger screen.
The earlier Kindles with azw3 can't do KFX, which is likely some HW limit too.
Edit:
The Data Discman is in the Mobileread wiki here
https://wiki.mobileread.com/wiki/Data_Discman