> These releases could only run one application at a time, though
> special application shells such as Switcher (discussed under
> MultiFinder) could work around this to some extent. System 1.0, 1.1,
> and 2.0 used a flat file system with only one kludged level of
> folders, called Macintosh File System (MFS); its support for folders
> (subdirectories) was incomplete. System 2.0 added support for
> AppleTalk and the newly introduced LaserWriter to use it. System 2.1
> ( Finder 5.0 ) introduced the HFS (Hierarchical File System) which
> had real directories. This version was specifically to support the
> Hard Disk 20 and only implemented HFS in RAM, startup and most
> floppy disks remained MFS 400K volumes. System 3.0 was introduced
> with the Mac Plus, officially implementing HFS and 800K startup
> drives and adding support for several new technologies including
> SCSI and AppleShare and introducing Trash "bulging" (i.e., when the
> Trash contained files, it would gain a bulged appearance). System
> 4.0 came with the Mac SE and Macintosh II, which required additional
> support for the first expansion slots, the Apple Desktop Bus (ADB),
> internal hard drives and on the Mac II, color, larger displays and
> the first Motorola 68020 processor.
>
> -Wikipedia
This single-tasking, flat file system, black and white dinosaur has
aged fairly well. It is not an operating system anyone will bother to
use today, but it's clarity of vision still shows through. Load it up
in an emulator and remember the first time you asked, "Why would I
want to attach a mouse to my computer?"
The archive includes a System 1.0 and System 1.1 disk image.
Compatibility
Architecture: 68k
Earliest Macs as the original (128k) and 512.
B & W - I do not know any further.
