Well, I will wait for
Charlieman to offer his report within the next 48 hours then.
In the meantime, I would like to mention that to format a 400k floppy as HFS you must do the following:
1) Be running Finder 5.x or 6.x.
2) Format your 400k floppy but hold down the OPTION key when you click one-sided.
But the bottom of
this web page makes it clear that you cannot boot off an HFS 400k floppy in the Mac 512k with 64k ROMs (because the ROMs don't support HFS). And since the computer cannot read the HFS 400k disk, putting the HD20 INIT on that disk in an attempt to make it boot won't work. It won't work because the computer needs to be able to understand the format of the disk in order to read it. If the computer cannot read the disk, then the HD20 INIT cannot be loaded. Hence, you cannot boot off HFS formatted 400k disks on the stock Mac512. If you try it and it works, then you have a 512ke (with the 128k ROMs).
Here is
my detailed HFS/MFS post on this subject.
So you can see why the
information posted here is clearly misleading at best. And despite what that site says, you will be hard pressed to fit System 6 and Finder 6 on a 400k floppy, even after trashing all the CPs, extensions and purging all fonts from the System file.
By the way, I just tested
System 4.2 and Finder 6.0 on an 800k HFS floppy. I first booted off an MFS 400k disk that had the HD20 INIT. I then put my 800k floppy in my external 800k drive (the drive being directly connected to the Mac512). Then in the Finder, I double-clicked TeachText on the 800k floppy, which then switched the Systems from the 400k disk to the 800k disk. I could then eject the 400k disk and there was no need to reinsert it.
So if I redo my past tests on the 512, it would be in like manner. Namely, I would boot off an MFS 400k disk that had an older system/finder and the HD20 INIT. I would then need to see if I can put System/Finder 6.0.x on an HFS 800k disk and see if control will be handed over when I double-click an app on that disk. Of course, I could also try an MFS 800k disk too, but I've not found a way to format an 800k floppy as MFS on my Mac512k with 64k ROMs, without
resorting to a hack.
(You must verify whether or not the disk is HFS by booting with an HFS aware system or the HD20 init. Only then can you see the single pixel in the Finder window that shows if a disk is HFS formatted. If you see the pixel in the Finder window, then your disk is HFS 800k, not MFS 800k).
But booting off an HFS 400k disk with System/Finder 6.0.x is impossible on a Mac512 with 64k ROMs.
UPDATE: I just formatted an 800k MFS floppy by booting off the "magic" MFS 400k System 2.0 and Finder 4.1 disk (that also has the HD20 init). I then copied the contents of my S4.2/F6.0 800k HFS floppy to my MFS 800k disk. I then double-clicked TeachText on the MFS 800k disk which in turn switched System/Finder control of the computer to that disk. I was then able to use my MFS 800k disk just fine. I then rebooted and tried booting off the MFS 800k floppy (which also has the HD20 init installed in the System Folder). After a few seconds, I got to the Welcome to Macintosh screen but then a System Error ID=12 appeared. For whatever reason, I cannot boot off this 800k MFS disk with System 4.2. I also deleted off the HD20 INIT on the MFS 800K disk and then tried booting off it again. Nope. Same ID=12 System Bomb at boot time. So clearly, if I cannot get a known-good S4.2/F6.0 combination to boot of an MFS 800k disk, I don't see how I can get a System 6.0.x MFS 800k disk to boot!
Another Update (and possibly the "final word" on the subject):
I continued to test with various Systems and Finders in my MFS 800k floppy. I found that the "magic" S2.0 and F4.1 combination works great to boot my Mac512 off this MFS 800k floppy. I confirmed this works great with or without the HD20 INIT. Ditto for S4.1 and Finder 6.0, with or without the HD20 INIT. I then copied S4.2 over S4.1 after confirming that S4.1/F6.0 boots, leaving all other System files as is, but then the machine did not boot. So this would seem to show that S4.1 is the limit when booting off an MFS 800k floppy (at least, when in conjunction with Finder 6.0).
I then grabbed my 6.0.7 800k HFS disk and copied the System Folder to my MFS 800k floppy. After that, I double-clicked an app on my MFS 800k disk and the app launched just fine, and System level control of the computer was handed over too the 800k MFS floppy at that point. But when I quit the app and before I got back to the Finder, I got a System Bomb, ID=2.
I then proceeded to boot off my System 6.0.7 MFS 800k floppy. I got to the Welcome to Macintosh screen but then I got the error shown in
this photo. Hmmm.
I then made an 800k HFS disk from a System 6.0.5 image that I had stored on my SE/30 -- "System Tools" (1 of the 4 System 6.0.5 install disks). I then put that disk into my Mac512's 800k external drive and proceeded to copy the System Folder onto my MFS 800k floppy. After the copy was completed, I launched an app on the MFS 800k disk and the app launched. But when quitting the app I got the ID=02 System Bomb. I then tried booting off the 6.0.5 MFS 800k floppy, but just as it got to the Welcome to Macintosh box, the box went blank and then started flickering like mad, at which point my Mac512 locked up. I then booted off my 400k S4.1/F6.0 floppy and then inserted the HFS 800k System Tools 6.0.5 disk. I double-clicked the installer app, but after a few seconds my Mac512 threw up another ID=02 System Bomb dialog.
Never willing to give up, I then copied my known-good copy of System 4.2 into the System Folder of my MFS 800k 6.0.5 disk (replacing System file 6.0.5). All other files in the System Folder were left untouched. I then added the HD20 INIT. This time, it booted to Welcome to Macintosh without the flickering freeze, but a second later (about when the Finder is to load), I got the ID=02 bomb dialog (with the Welcome to Macintosh box still visible in the background).
Am I beat? Heck no. I then tested S4.3/F6.0 with and without the HD20 INIT on my MFS 800k floppy. Nope. I get an ID=12 bomb at boot time. I then tried the same S4.3 and F5.5. Nope. Same ID=12 bomb. But my S4.3 didn't come from a disk image, so perhaps my copy of S4.3 is bad? No way for me to know without having a known good disk image, so if someone would be so kind as to help me out in that regard, I am happy to retest with S4.3.
Finished, you ask? Never! I then proceeded to put S4.2 and F6.1.8 onto an MFS 400k floppy, in a System Folder. No other files were on the disk. At boot time though, I got an ID=12 System Bomb.
And so, as you can see, the best I can do is S4.2 and F6.0 when running off an MFS 400k or MFS 800k floppy. If Charlieman can do better on a stock 512, I would certainly like to hear how it's done!
Thoughts?
