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15

There was no public release of DOS 1 or 2. DOS 3.1 was actually the first release to the public. It had a pretty significant bug in its MASTER CREATE program, and so the patched version DOS 3.2 was released. DOS 3.1 dates back to about June 1978. @fadden references the Wikipedia page for Apple DOS which notes the existence of 3.2.1 which I had neglected ...


6

The Disk II controller in its original is effectively limited to the Disk II because of the connections offered; in particular it expects direct control of a four-phase stepper motor whereas the standard Shugart bus exposes only step and direction signals. It was also explicitly limited in terms of density, and effectively limited in terms of potential ...


5

The IWM chip, used in the prototype Mac with double sided "Twiggy" drives, and later in the original production Mac 128k with Sony 3.5" diskette drives, is basically Woz's original disk controller design (converted by Wendell Sander and Bob Bailey to NMOS), with the addition of buffer registers to allow the processor to run a bit more asynchronously. But, ...


5

TL;DR It's wasn't any more specific than any other controller. Apple did in fact make the switch to 3.5" (for the Mac) using the Apple II controller - just now as a single chip implementation called IWM - Integrated Woz Machine. In general, it doesn't matter and any controller could be used for any drive (size) - given they use a compatible plug. Like ...


2

There were also two other formats common on the Apple ][: Pascal and CP/M. Though the latter required a special Z80 CP/M card (such as the Microsoft Softcard), the former was proprietary to the UCSD Pascal system that was released in the late 1970s. I believe the idea was that since UCSD Pascal was a cross-platform p-Code environment, the format would be ...


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