Re: disk image emulator on the GS - possible?

[Polymorph <polymorph69@hotmail.com>]

On Jul 3, 9:14 am, Polymorph <polymorp...@hotmail.com> wrote:
> On Jul 3, 6:57 am, Toinet <antoine.vig...@laposte.net> wrote:
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> > On 2 juil, 01:52, "Charlie" <charlieD...@verEYEzon.net> wrote:
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> > > "Toinet" <antoine.vig...@laposte.net> wrote in message
>
> > >cc928f2a-ebb1-4549-9345-0aa5a2d46bfb@z14g2000yqa.googlegroups.com">news:cc928f2a-ebb1-4549-9345-0aa5a2d46bfb@z14g2000yqa.googlegroups.com...
>
> > > > Hi All,
>
> > > > I like that post, I worked on such a IIgs thing in January 2009 in
> > > > order to mount CBM D64 images.
>
> > > > The objective is to double-click a disk image (DSK, PO) and thanks to
> > > > the IPC thing in a PIF, load the file into memory, perform the
> > > > necessary checks and add it into the list of devices.
>
> > > > What is interesting is that the driver is responsible for the
> > > > different block reads and writes or inits and that's all, the rest of
> > > > the job is performed by the FSTs.
>
> > > > I developed that new driver with my source code of the RAM5 (works
> > > > with the RAM but is firmware related) and ensoniqRAM (not hardware
> > > > related) drivers but I failed as I am still unable to simulate the
> > > > disk insertion or ejection which would update the device list, even
> > > > with the help of the different GS/OS books.
>
> > > > If one understands that notion (how to mount/unmount a device), please
> > > > contact me and I will finish that one during my summer vacation,
>
> > > > antoine
>
> > > Hi Antoine,
>
> > > I'm really glad you jumped into this discussion since I feel I was
> > > getting in way over my head.
> > > It seems you are very close to what the original poster wanted.
>
> > > First I have to say that I've never done any device driver programming
> > > for the Apple IIgs. Since I don't want anyone to think I would let my
> > > ignorance stop me from posting I'll ask if you have tried using the
> > > system service call SET_DISKSW which is supposed to notify GS/OS that a
> > > disk switched or is in an off-line condition.  If I understand the
> > > description of the call (page 283 of the device driver reference)
> > > drivers can request a change in the disk switched status which is
> > > maintained by the device dispatcher.  I believe the device dispatcher is
> > > responsible for the device list.
>
> > > Anyway the description sounds a lot like what you want so I had to ask.
>
> > > Charlie
>
> > Thanks for your help, I appreciate. SET_DISKSW requires a device
> > number which I do not have as I need to let it be set by the device
> > dispatcher.
>
> > Then, I have had an idea: browse the contents of your Apple II
> > Developer CDs and the answer is to be found here: cd1 / System 6.0
> > sample code / System 6 pieces / SCSI.Drivers / SCSI Driver Mgmt
>
> > The way the Apple SCSI driver works is described hereafter: have a
> > default empty Device Independent Block and set it as not HW related.
> > That's all.
>
> > When a DStatus or DInfo is performed, control is passed to a routine
> > (unit_state) which creates DIBs dynamically depending on the
> > physical / logical volumes present on the device.
>
> > Consider now that we are in the FinderExtension, we have just double-
> > clicked the disk image we want to add to the system, we need to tell
> > our driver that a new device (then volume if recognized) must come
> > online. That can be done of two different ways:
> > - call a subcall to the driver and tell it to add the volume and make
> > it online (if not already in the devices)
> > - perform like IR from M. Deatherage does: InitialLoad2 a new driver,
> > set the interesting values and call it
>
> > And the volume will come online because of the SET_DISKSW call that
> > will be performed!
>
> > Oh, I think I will enjoy my summer holidays!
>
> > antoine
>
> Cool, we look forward to seeing the results!
>
> As an aside, for a relative newcomer to the IIgs (I got my 1st IIgs in
> 2006!), are the developer CD's with source code that you mentioned
> still available anywhere? I'd love to get my hands on these rather
> than trying to reinvent the wheel all the time.  :-)
>
> Cheers,
> Mike

Sorry, please disregard my previous comment regarding the developer
CD's!

I just remembered that I have some of these CD's too thanks to the
generous efforts of Paul R. Santa-Maria, and Willi who uploaded them
to the Apple II Gmail account about 18 months ago. I really should go
through these CD's when I get some free time....

Cheers,
Mike