#System 7.0 - 7.6 - 9 Emulator Mac OS Before#

System 7.0 - 7.6 - 9 Emulator Mac OS Before

But I also wanted to run System 6.0.8 (the last Mac OS before System 7), and its easier for.As time passes and floppy disks become relics of computingвЂ™s past (especially in the Macintosh world), folks seem to be confronting more problems accessing information stored on this older format. But whereas Mini vMac is primarily aimed at emulating the Mac Plus, Basilisk can either emulate a Mac Classic or a Mac II series model (hence Basilisk II there never was a Basilisk I), depending on the configuration/build and ROM file used.The latter emulation will run System 7.6, which I wanted to do. IMG files used by vMac and Fusion and other emulators are not true disk sector images of Mac hard disks.Working with Macintosh Floppy Disks in the New MillenniumRecommended: Mac System 7.x through Mac OS 8.1 Performa ROM Basilisk II is another well-maintained Motorola 68000 series emulator. Use Quadra mode to run Mac OS 7.5, 7.6, 8.0, and 8.1 68040 compatible programs in color.HFX and. System 7 was developed for Macs that used the Motorola 680x0 line of processors, but was ported to the PowerPC after Apple adopted the new processor.Use Mac II mode to run System 7.0 and Mac OS 7.5 68020 compatible programs in color. With the release of version 7.6 in 1997, Apple officially renamed the operating system 'Mac OS', a name which had first appeared on System 7.5.1's boot screen.

One of many, many causes was the higher price of Macintosh computers. That is why Mac floppy drives make sounds of different audible pitches as they move around the disk surface: the motor speed is changing! As of the emergence of high-density (HD) floppies in the early 1990s, Apple was growing weary of being slammed around in the marketplace. Similarly, double-side double-density (DSDD or for our purposes DS) 3.5' floppies hold 720k on a Wintel, and 800k on a Mac.How did Apple do this? By using a variable-speed spindle drive system instead of fixed-speed, to cram more data on the same magnetic material space.

(I donвЂ™t have/could not easily make a 360k floppy to test this theory.)Unless you can find an external USB drive that specifically claims to support Mac 800k disks (i really doubt you will find one that supports 400k), you will almost certainly need to find an older Mac with a built-in floppy drive to access your data on DS and SS disks. My guess would be that they could read 360k SS floppies from other systems. TheyвЂ™ll likely also read 720k DS floppies. This is fact: With 1.4 MB HD floppies, Apple agreed that fixed-speed drive was what they would use.Bottom line: a generic fixed-speed external USB floppy drive will work with 1.4 MB HD floppies, yet (to the best of my knowledge, and i may be wrong) not Mac 800k or 400k floppies. It was a whole lot easier and more financially sane for Apple to go with the flow and use the same standards for 1.4 MB floppies as the Wintel worldвЂ¦В economies of scale, dontcha know! This is all my conjecture, anyway. As the Wintel juggernaut began to steamroll them, Apple sought ways to cut costs.

It had the illusion of folders, yet no actual directories. MFS вЂ” Macintosh File SystemYouвЂ™re suffering from the MFS Blues! MFS, the original Macintosh File System, was a flat-file structure used on Macintosh computers from Day 1 until the era of the 128k ROMs and the Mac Plus, which is to say circa 1986. The working, mounted disk Finder windowвЂ”same disk, same conditionsвЂ”was when the very same Mac was running OS 7.6.1. The вЂњunreadableвЂќ picture was when OS 9.1 was in charge. The difference? The Mac OS version running the machine. They are two screenshots of the same floppy disk in the same drive of the same Mac, taken minutes apart.

A person might have several Macs, one or more of them original 128k or 512k non-Enhanced вЂњFat MacsвЂќ (Fat=more RAM in this case) with the original 64k ROMs which only understood MFS format. 800k DS disks formatted 400k MFS?Many Mac users have found it tough to let go of their older Macs, especially early on when they were (relatively) very expensive pieces of equipment. Clicking the Two-Sided button formatted the disk as 800k HFS. Apple needed to count on the user to make the correct choice (screenshot is from System 3 running on a Mac Plus):Clicking the One-Sided button formatted the disk as 400k MFS. Folks who used these tricks could create 400k HFS floppies for sure, and maybe 800k MFS floppies.)Thing is, on these early Mac OS versions which supported both MFS and HFS, there was no electro/mechanical way to detect DS from SS diskettes. (There are tricks to circumvent these defaultsвЂ¦В tricks i have not used and therefore not memorized.

Older Sony single-sided disks and most single-sided disks from other manufacturers would behave as expected: they would fail to format as two-sided. Someone found out that the less expensive Sony single-sided 3.5' diskettes sold new during this period more often than not formatted successfully as 800k double-sided. Rumors circulated circa 1987 that due to lower demand for single-sided 400k diskettes, Sony merely ran the same production line for double-sided 800k and single-sided 400k, marking them differently and probably not QAing the second side for the ones being sold as single-sided. 400k SS disks formatted 800k HFS?!As well, floppy disks were expensive in the mid-late 1980s. Thus, while rare, it may not be terribly unusual within a specific floppy disk collection to find disks marked DS/DD with 400k capacity and MFS formatting.

400K diskettes and Mac OS 8The 400K MFS diskette format is not supported by Mac OS 8. From the Apple Installing Mac OS 8 Read Me: With Mac OS 8.0, Apple eliminated OS support for MFS format. System 7.5.0 through 7.5.5 allowed writing to as well as reading from MFS-formatted floppies, but did not allow erasing/formatting SS and DS disks as anything other than 800k double-sided HFS or ProDOS (Apple II format), or 720k DOS:The screenshot is from OS 9.1, yet other than cosmetic alterations, itвЂ™s the same dialog all the way back to System 7.5 (7.5.0).The upshot of all this is one cannot trust the marking on the diskette! Probably the single-side/double-side marking (when it even exists in the first place) will match reality, but donвЂ™t count on it!This is how things worked and remained pretty compatible from something like System 3 up through the end of Mac OS 7 (7.6.1). Which OSes supported what?Allowing (requiring) the user to select single- or double-sided when erasing (formatting) a floppy disk remained as shown above all the way through the end of System 7.1 (7.1 Update 3).

That disk was not locked, nor was the drive having any trouble sensing the diskвЂ™s lock slider. Now, disk images are a whole other story!Specifically, OS 7.6.1 will read MFS-formatted floppy disks, but it will not write to them, including erasing/reformatting them in their MFS form:Notice the padlock icon in the вЂњworkingвЂќ screenshot above. You need OS 7.6.1 or earlier to work with 400k MFS disks.

Any Floppy Format: 1.4 MB HD, 800k DS, 400k SS: Some Work, Some DonвЂ™t Defective Floppy Below i discuss some ways to handle this dilemma. Read, copy to newer media, recycle!This presents an interesting dilemma for folks with Beige G3 and later Macs with built-in floppy drives: These Macs originally shipped with OS 8.0 or later, and are therefore unlikely to run with OS 7.6.1 or earlier without some serious hacking! And anything earlier wonвЂ™t run any OS X without a healthy dose of XPostFacto hackery.

IвЂ™ve not been desperate enough to go beyond these for the very few floppies unable to be fixed by these two programs. I start with the latest version of Apple Disk First Aid my Mac will run (8.6.1 for Power PC Macs, 8.2 for 32-bit 680x0 Macs, 7.2.4 for 24-bit Macs), then move to AlSoft DiskWarrior 2.1.1 (end of the 2 series). Most of the usual repair utilities that can repair hard drives can also fix floppy disks. If you get it to mount, copy the data right away!

I never used these much, and donвЂ™t know if they can do anything that DFA and DW cannot.

System 7.0 - 7.6 - Mac Os 9 Emulator