Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!uunet!snorkelwacker!apple!Apple.COM!lsr From: lsr@Apple.COM (Larry Rosenstein) Newsgroups: comp.sys.mac Subject: Re: Lisa-IIx ? Message-ID: <6919@internal.Apple.COM> Date: 27 Feb 90 02:39:47 GMT Sender: usenet@Apple.COM Organization: Objects-R-Us, Apple Computer, Inc. Lines: 33 References:<1127@madnix.UUCP> <1549@tuegate.tue.nl> In article <1549@tuegate.tue.nl> rcbaem@eutrc3.urc.tue.nl (Ernst Mulder) writes: > On the Lisa there's no difference between DAs and applications, and I There were no DAs on the Lisa, because there was no need for them. You could always launch another application, so it didn't make sense to create a separate DA mechanism. The Calculator was just a simple application. > couldn't even tell whether the Trash Can was in fact a separate The Trash Can was implemented by the "Finder"; the underlying O/S was very conventional. The folders and icons were stored in a database, and had nothing to do with the underlying file system. In the file system documents had names such as {D1234T1}, but the user would see the "friendly" name. Because of this, there was no restriction against giving two icons the same name. Also, most documents consisted of more than 1 physical file, but this was invisible to the user. Another feature was that you could assign passwords to individual folders. That was implemented in the File System. Also, each application maintained the last saved version of the document as well as an optional set aside version. The latter was created if you turned off the machine, and reopened when starting up again so that the user could pick up where s/he left off. Larry Rosenstein, Apple Computer, Inc. Object Specialist Internet: lsr@Apple.com UUCP: {nsc, sun}!apple!lsr AppleLink: Rosenstein1