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- Date: Thu, 18 May 1995 13:24:13 +0200
- To: executor@nacm.com
- From: ernstoud@euronet.nl (Ernst_J._Oud)
- Subject: Re: Using MAC low-density disks.
- Sender: owner-executor@nacm.com
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-
- >>>>>> "Jesse" == g sightler <g.sightler@genie.geis.com> writes:
- >
- > Jesse> Actually, it would be possible to do this without the MAC
- > Jesse> floppy drive, if someone was willing to put the many hours
- > Jesse> necessary into it. <g> Seriously, it is VERY timing
- > Jesse> sensitive (which rules out the possibility of running it
- > Jesse> under any mulitasking OS), but it can be done with the
- > Jesse> right amound of hacking/patience.
- >
- > Jesse> In fact, the early MAC emulators for the Amiga did this
- > Jesse> rather well (of course, they had to shut off multitasking
- > Jesse> to do it :).
-
- > Clifford T. Matthews replied:
- >
- >Well it certainly won't happen between now and when 2.0 comes out.
- >Even then I'm not sure that the PC has the same sort of control over
- >the floppy disk that the Amigas did. After 2.0 comes out we'd
- >probably be willing to pay some $$ to get this functionality, but I'd
- >also guess that just a simple program to read 800k Mac disks on a PC
- >would also generate some revenue, which then begs the question "if
- >it's doable, why hasn't someone done it?" Specifically, why hasn't
- >someone written a program for the PC which reads an 800k formatted
- >floppy (writing is much less important).
-
- Had the same thoughts and had someone look into the SWIM chip of Mac's
- (Super Woz Integrated Machine) - handles diskette I/O. It is IMPOSSIBLE to
- do this on a PC without
- hardware. The 800K Mac drives (and all drives since then) use a variable
- spindle speed
- of the disk drive's motor. This motor on PC drives can only be switched on
- or off. There is
- no software control over its speed. When the speed cannot be controlled
- there is no way
- to decipher the information that comes from the controller.
-
- Indeed if it would have been possible you can bet your life that someone,
- somewhere would have come up with a scheme, we are talking 11 years now!
- (1984-1995). I have seen people mentioning hardware that could do it., but
- this appears not to be available
- any more.
-
-
-
-
-
- Ernst J. Oud
-
- 'Appreciate what you've got, 'cause basically I'm fantastic.'
- Holly the ship's computer of spaceship Red
- Dwarf.
-
-
-
-