Re: disk image emulator on the GS - possible?

["Charlie" <charlieDOTd@verEYEzon.net>]

"Toinet" <antoine.vignau@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