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- From: John Le Febvre <John@klatch.demon.co.uk>
- Newsgroups: comp.emulators.mac.executor
- Subject: Re: 800k disks possible at all?
- Date: Fri, 24 May 1996 14:46:46 GMT
- Organization: London
- Lines: 36
- Message-ID: <891798180wnr@klatch.demon.co.uk>
- References: <319631C6.3D6B3857@yoshac.demon.co.uk> <4o422f$4fi@newsbf02.news.aol.com>
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- In article: <4o422f$4fi@newsbf02.news.aol.com> eadeans@aol.com (EADEANS)
- writes:
- >
- > >>Actually, I think they did it by varing the speed at which the data
- > is written to the disk, depending on how far out the head is from
- > the centre of the disk.
- > <<
- >
- > This makes good sense. Apple used a similar scheme to cram over 800K on
- > the 5 1/4 floppies for the original Lisa Office System computers (in
- > 1983).
-
- Weren't those "Twiggy" drives 400K? They had two notches on the disk as the
- read/write heads were not above/below each other. The Lisa2 (or whatever
- it was called) had 400k 3.5" disks (single sided) which were soon replaced
- by the 800k double sided ones.
-
- > Does anyone know of a way to read or create disk images from old 5 1/4
- > ProDOS disks on a PC? I want to convert my old //c Appleworks stuff over &
- > use it on Clarisworks. I'm also going to try an Apple IIe on Mac emulator
- > under Executor (on OS/2 virtual DOS) just for fun!
-
- Yes, but you need an original Apple II of some sort, be it a whole machine
- (II,II+,//e with Super Serial Card) or a IIc or IIc+. Then get a bit of
- software called ADT (for the PC) or MacADT. Check out the
- comp.emulators.apple2 FAQ for more info.
-
- > Ed.
- > TeamOS2 & ClubOpenDOC
- >
- >
- --
- John.
- john@klatch.demon.co.uk
-
-
-