<p><pre><code> The Apple-II cassette interface is simple,
fast, and I think most reliable. The data
transfer rate averages over 180 bytes per
second, and the recording scheme is compatible
with the interface used with the
Apple- I.
</code></pre>
Note that this is almost as fast as the <i>floppy disk</i> drive on the Commodore 64. This is why people remember Woz but not the anonymous engineer(s) behind the 1541 disk drive.
Great to see this again. The description at the time of the video hardware is important. My first computer, purchased around four years later, also had a 6502 and memory mapped video. Unlike the Apple, it did absolutely nothing to interleave the video memory access - if the CPU accessed the video RAM, there would be a momentary black horizontal line on the screen. Many of the Apple II's competitors were the same.