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custom Start.GS.OS?
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Ivan X
Jan 9, 2012, 11:26:36 PM1/9/12
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Hello world,
I know a lot about 8-bit Apple II's and very little about the 16-bit
one.
I want to have have a replacement Start.GS.OS which launches ProDOS 8
instead of kicking off GS/OS. (The purpose is that when you network
boot a IIGS which is set to GS/OS in its Network control panel, it
will always try to run Start.GS.OS, and I want it to be able to land
safely in ProDOS 8 instead if the rest of GS/OS isn't there.)
I assume this must be doable -- everything is doable. Any pointers or
reference guides you'd suggest, or thoughts?
I know a lot about 8-bit Apple II's and very little about the 16-bit
one.
I want to have have a replacement Start.GS.OS which launches ProDOS 8
instead of kicking off GS/OS. (The purpose is that when you network
boot a IIGS which is set to GS/OS in its Network control panel, it
will always try to run Start.GS.OS, and I want it to be able to land
safely in ProDOS 8 instead if the rest of GS/OS isn't there.)
I assume this must be doable -- everything is doable. Any pointers or
reference guides you'd suggest, or thoughts?
Steven Hirsch
Jan 10, 2012, 7:19:44 AM1/10/12
to
Ivan X
Jan 11, 2012, 5:47:31 PM1/11/12
to
> On 01/09/2012 11:26 PM, Ivan X wrote:
> >
> > I want to have have a replacement Start.GS.OS which launches ProDOS 8
> > instead of kicking off GS/OS. (The purpose is that when you network
> > boot a IIGS which is set to GS/OS in its Network control panel, it
> > will always try to run Start.GS.OS, and I want it to be able to land
> > safely in ProDOS 8 instead if the rest of GS/OS isn't there.)
On Jan 10, 7:19 am, Steven Hirsch <snhir...@gmail.com> wrote:
> >
> > I want to have have a replacement Start.GS.OS which launches ProDOS 8
> > instead of kicking off GS/OS. (The purpose is that when you network
> > boot a IIGS which is set to GS/OS in its Network control panel, it
> > will always try to run Start.GS.OS, and I want it to be able to land
> > safely in ProDOS 8 instead if the rest of GS/OS isn't there.)
>
> Rename P8 to Start.GS.OS?
Tried it. Crashes to monitor. Poking around, it looks like it loads it
at $6800 rather than $2000 where it needs to be. I prepended some code
to move it, but it doesn't look like that ever gets executed before
the crash happens. So, more poking around to do.
Antoine Vignau
Jan 15, 2012, 5:36:29 PM1/15/12
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8) and not Start.GS.OS which is loaded at $00/6800.
I don't know how to change that behaviour.
Antoine
Geoff Body
Jan 17, 2012, 9:22:27 PM1/17/12
to
Ivan,
this should allow pressing the 8 key at inital network boot and over
ride the BRAM settings
There is a small time interval just as the 3 dots appear top left
that
you should be able to press 8 and boot to ProDOS.
The section of boot code loads at $1000, I have added extra code to
the end of this block of code and patched in a JSR at $1160 to jump
to
this code to check if 8 has been pressed.
"ProDOS16 Image"
all values shown below are HEX values
offset 100 (new LSB of code size to load)
92
offset 360
20 7d 14
offset 67d ( offset to current end of second stage boot code)
ad 0 c0 29 ff 00 c9 b8 0 d0 06 a9 02 00 8d 53 14 a9 10 0f 60
Geoff
reposting under the correct subject
this should allow pressing the 8 key at inital network boot and over
ride the BRAM settings
There is a small time interval just as the 3 dots appear top left
that
you should be able to press 8 and boot to ProDOS.
The section of boot code loads at $1000, I have added extra code to
the end of this block of code and patched in a JSR at $1160 to jump
to
this code to check if 8 has been pressed.
"ProDOS16 Image"
all values shown below are HEX values
offset 100 (new LSB of code size to load)
92
offset 360
20 7d 14
offset 67d ( offset to current end of second stage boot code)
ad 0 c0 29 ff 00 c9 b8 0 d0 06 a9 02 00 8d 53 14 a9 10 0f 60
Geoff
reposting under the correct subject
Ivan X
Jan 18, 2012, 9:44:20 AM1/18/12
to
On Jan 17, 9:22 pm, Geoff Body <gbo...@bigpond.com> wrote:
> this should allow pressing the 8 key at inital network boot and over
> ride the BRAM settings
Geoff, this is fantastic. Works great. You are truly the Boot Blocks
> this should allow pressing the 8 key at inital network boot and over
> ride the BRAM settings
master. (I also patched in your cleartext login fix, though I think
it's not necessary because in the distribution I assembled, randnum is
available.) Thank you!
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