<story><title>Documenting Sony Memory Stick</title><url>https://dmitry.gr/?r=05.Projects&amp;proj=31.%20Memory%20Stick</url></story><parent_chain></parent_chain><comment><author>gambiting</author><text>Somewhat related anecdote - my dad bought one of the first &amp;quot;proper&amp;quot; digital cameras of its day, the Sony CyberShot F707. Even now, looking back at the quality of the pictures taken with it, it&amp;#x27;s still mighty impressive(well, it was reflected in the price tag too, but I digress).&lt;p&gt;The camera used memory stick format, and my dad shelled out for the ridiculously expensive 128MB card to go with the camera, which was great.....except that even that stupidly expensive memory stick could only hold about 50 pictures. But......we quickly discovered some setting on the camera which made it store something like 500 pictures on the card instead! Brilliant! And they still look the same on the display, so no harm done, right?&lt;p&gt;Well, cue to our first family holiday with it, and coming back only to discover that pictures taken in 640x480 resolution &lt;i&gt;really&lt;/i&gt; don&amp;#x27;t cut it. That was a very.....sad lesson to learn about resolutions and digital cameras.&lt;p&gt;I remember much later we bought a 256MB memory stick that was basically two 128MB sticks in one - it had a physical switch between &amp;quot;side&amp;quot; A and B.</text></comment>
<story><title>Documenting Sony Memory Stick</title><url>https://dmitry.gr/?r=05.Projects&amp;proj=31.%20Memory%20Stick</url></story><parent_chain></parent_chain><comment><author>boondaburrah</author><text>Okay, but to be fair I immediately recognised the &amp;quot;ready&amp;quot; signal 0xAA or 0x55 as &amp;quot;oh, it just toggles the bit every clock. That sounds oddly useful. You can probably sync a clock or something on that.&amp;quot; I&amp;#x27;ve also run into situations where I&amp;#x27;m counting bits and the flip-flop doesn&amp;#x27;t actually get set until the &amp;#x2F;next&amp;#x2F; clock pulse, so having the phase change bit arrive one cycle early seems like a kludge around that sort of thing.&lt;p&gt;Ya gotta remember that Sony is hardware people so they do inscrutable things in software that probably turn out to make silicon implementation easier.</text></comment>