Visicalc for this computer, in 1979. This “killer application” was immensely popular, resulting in many Apple II purchases. The laptop was improved and upgraded multiple times. Over 2 million ...

which were the predominant desktop business software of the time (see CPM). Apple II, II Plus, IIe and IIc Introduced in 1977, the Apple II came with 4K of RAM and hooked up to a TV and cassette ...

So when [Joshua Coleman] combined his retro-looking DIY modular synth with the equally retro Apple II computer ... can output voltages between 0 and 2.55 V at 8-bit resolution (or 256 steps ...