Re: Tweaking DOS.SYSTEM from Extra-K to support other DOS 3.3 variants

["Bill Garber" <willy46pa@comcast.net>]

"Moll" <MollyBaker@Spam.GMAIL.Spam.Spam.Spam.Com> wrote in message
news:oSi2e.24491$Ue6.7583@trndny04...
: Ed Eastman wrote:
: > Moll wrote:
: >
: >> I've been working on this concept, a DOS.SYSTEM that loads Pronto-DOS,
: >> or ZDOS, or TurboDOS, instead of DOS 3.3
: >
: > ...
: >
: >> immediately exits to BASIC after initialization, it does not attempt
: >> to RUN HELLO.
: >
: >
: > I like your idea!
: >
: > Hm, sounds to me like you are initializing a running DOS, and not the
: > boot loader that actually does the call on start-up.
: >
: > Look into the boot process (Beneath Apple DOS) and see where your
: > intialization needs to go one DOS is lit.
: >
: > Thankx,
: > Ed
:
: The code that runs the DOS is actually the first 256 bytes of
: DOS.SYSTEM.  The real DOS.SYSTEM does a RUN HELLO once DOS is initialized.
:
: I am thinking the issue could be that I am saving a running DOS image,
: rather than a DOS boot image.  However, I do not know how to pull a DOS
: boot image off a disk and save it as a file.  If I could do that,
: perhaps my problem would be solved. (Note - I would prefer to be able to
: do this from both DOS and ProDOS, if possible.)

To pull the DOS boot image, simply INIT, not INIT HELLO, a disk and all that
should be there is the DOS boot image. Be sure that the disk is clean, new
and
not used, when doing so. Remember that the first 256 bytes of boot is
located
in ROM on the Disk II/Apple 5.25 controller. This 256 bytes must be modded
to
work as a file loaded DOS. Similarly, the FlashROM boot code was modded in
order
to load from the FlashROM. Download "FlashROM.zip" from my server. This
explains
much of how it was done.

Apple II Forever, Apple II Together
Bill @ GarberStreet Enterprizez
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