bryce@COGSCI.BERKELEY.EDU (Bryce Nesbitt) (05/23/87)
There has been a lot of net-noise about converting one disk format to
another. I did some research and compiled a list of accomplishments
and possibilities for the Mac, Amiga and ST.
Foreign format Any of the many ----------
------------------------------------------------ |
Host\/ |IBM 5.25 IBM 90mm Mac ST Amiga 1571 Apple ][ CP/M
---------------------------------------------------------------------------
ST | YES | YES | NO | YES | NO | NO | NO | NO $ |
---------------------------------------------------------------------------
Mac | NO ? | NO ? | YES | NO ? | NO ? | NO ? | NO $ | NO ? |
---------------------------------------------------------------------------
IBM | YES | YES | NO | YES | NO | NO | NO | YES |
---------------------------------------------------------------------------
AMIGA | YES | YES | SOON | YES | YES | YES | NO $ | PLANNED|
---------------------------------------------------------------------------
This assumes a stock machine with a size compatible drive attached to the
stock floppy hardware. The IBM 90mm format is the 720k flavor.
? means that it MAY be possible to do it
$ means it is easily possible, someone just has to do it
(For you non-metric types, 90mm is about 3.5")
The IBM and the ST use nearly the same controller, thus the similar results.
Swapping between IBM and ST is a trial-and-error thing. The disks want
to be formated by the IBM to work well at all.
XENOSOFT of Berkeley makes XENOCOPY for the IBM which does any of the 10
billion CPM and other pre-MSDOS formats like kaypro, osbourne, as well
as newer formats. If it is flat, doughnut shaped, rusty mylar and not
Apple ][, Commodore-64 (1541/1571), Amiga or Mac there is a good chance
it will know about it. This includes 8 inch.
The Mac uses a variable speed drive formatted in GCR, rather tricky to read.
The drives can be primarily software controlled, so there is hope that it
could be fooled, coaxed into reading just about anything. (5 speed manual)
As far as I know, this has not been done.
A company makes a IBM 90mm drive with a SERIAL port to talk to it.
This would be a cinch to hook up, but you would still need driver software
to read/write it.
The Amiga's DMA hardware and Paula chip are flexible enough to handle about
anything within the proper data rate. The utility to read/write PC disks comes
with the V1.2 upgrade, Central Coast Software makes one called dos-to-dos.
The same company sells disk-2-disk to read/write 1541/1571 disks. They have
demonstrated the ability to reliably read all tracks of a Mac disk and
are putting together a product due out in 3-4 months. (drive-2-drive? :-)
There is a special bit in the controler for switching to read/write Apple ][
formats. So far nobody seems to have released a utility that uses this.
XENOSOFT is rumored to be developing XENOCOPY for the Amiga, if and when
it is released it will do all the billions of 5.25" and 8" formats and
Apple ][.
-------------
Ack! (NAK,EOT,SOH)
|\ /| .
{o O} . bryce@cogsci.berkeley.EDU -or- ucbvax!cogsci!bryce
( " )
Ujww@sdcsvax.UCSD.EDU (Joel West) (05/25/87)
Re: reading/writing disks on a Mac.
1. Apple has a utility (Passport) to read Apple II 3.5" disks on
the Mac.
2. At least two third parties make serial port IBM 360K drives & software
for the Mac.
3. Apple has announced their own 360K 5.25" drive for the SE and II.
4. Apple plans a disk controller swap this year for the SE and II to be
able to read/write DG/1 (IBM Convertible) 720K 3.5" disks. These
disks can of course be used by the new IBM PS/2, although the preferred
format is 1.44 Mb.
I cannot speak to Mac compability with Atari or Amiga, nor do I ever
expect that Apple will address this.
--
Joel West
{ucbvax,ihnp4}!sdcsvax!jww (ihnp4!gould9!joel if I ever fix news)
jww@sdcsvax.ucsd.edu if you mustjohn@viper.UUCP (05/28/87)
In article <3220@sdcsvax.UCSD.EDU> jww@sdcsvax.UCSD.EDU (Joel West) writes: > >4. Apple plans a disk controller swap this year for the SE and II to be > able to read/write DG/1 (IBM Convertible) 720K 3.5" disks. These > disks can of course be used by the new IBM PS/2, although the preferred > format is 1.44 Mb. > >I cannot speak to Mac compability with Atari or Amiga, nor do I ever >expect that Apple will address this. If Apple plans to do #4, then they won't have to "address" anything. They will probably be able to read/write Atari ST disks. ST disk format is identical (well, -almost- identical anyway :) to IBM 3.5" format. The ST can read/write IBM formatted disks without any trouble. The IBM on the other hand is more touchy...If you format a disk on the ST, you need to use a PD utility that changes the boot sector to look like an IBM boot sector and then IBM will accept it... --- John Stanley (john@viper.UUCP) Software Consultant - DynaSoft Systems UUCP: ...{amdahl,ihnp4,rutgers}!{meccts,dayton}!viper!john