System 6.0.8 was released for free by Apple in 1990 and later.
1\. DL is a pre-installed image for the Mac Plus flavor of Mini vMac.
2\. DL is the Mac II flavor.
3\. DL is a System 6 image too with the build app for Mini vMac 3.X.
The "Manual" refers to the Mini vMac build app.

Other Mini vMac pages:
[Mini vMac (Source Code)][1]
[Mini vMac Extras][2]
[Mini vMac II Color Builds for Mac OS][3]
[Mini vMac 3.5 Build Environment][4]
[Mini vMac (Ready to Go)][5]
[Mini vMac 3.3.2 alpha (68k)][6]
[Mini vMac 128K with full Sony DC42 support][7]
[Mini vMac 128k (Macintosh 1984)][8]
[Mini vMac 1.0.0][9]
[Mini vMac 3.2.3 iOS (JAILBREAK APP)][10]
[Mini vMac II for Android, OS X, Windows][11]

See also vMac:
[vMac 0.1.9.X][12]
[vMac 0.19][13]

Compatibility
Architecture: 68k

A Mac_II ROM and a matching Mini vMac build with 8 MB RAM is needed to
run 2. DL in 256 colors.

  [1]: http://macintoshgarden.org/apps/mini-vmac-source-code
  [2]: http://macintoshgarden.org/apps/mini-vmac-extras
  [3]: http://macintoshgarden.org/apps/mini-vmac-ii-color-builds-mac-os
  [4]: http://macintoshgarden.org/apps/minivmac-35-build-environment
  [5]: http://macintoshgarden.org/apps/mini-vmac-ready-go
  [6]: http://macintoshgarden.org/apps/minivmac-332-alpha-68k
  [7]: http://macintoshgarden.org/apps/mini-vmac-128k-full-sony-dc42-support
  [8]: http://macintoshgarden.org/apps/apple-macintosh-1984
  [9]: http://macintoshgarden.org/apps/mini-vmac-100
  [10]: http://macintoshgarden.org/apps/minivmac-323-ios-jailbreak-app
  [11]: http://macintoshgarden.org/apps/minivmac-230-android
  [12]: http://macintoshgarden.org/apps/vmac-195
  [13]: http://macintoshgarden.org/apps/vmac-019b-and-vmac-019c