OS9 and OSX and Pelli-Zhang attenuator

1
I have a couple of questions for the community.

1) How do we feel about running the old psychtoolbox in OS9 mode under
OSX? I need to use OSX (it's a long story), but I want to use my old
OS9 experiments.

2) Has anyone successfully used the Pelli-Zhang attenuator with
psychtoolbox? The help for attenuator.m indicates that the function is
under development, but that dates from a few years ago.

Thanks,
Joe




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2
dear joe

1. you can run MATLAB 5.2.1 with the OS9 Psychtoolbox under Mac OS X
Classic. It runs fine in most ways, EXCEPT that there is no way to
synchronize to the display. It all seems to be working, in synch, but
in fact your are synching to an autonomous 60 Hz clock that Apple
substitutes for the actual blanking pulse of your display. If you don't
care about synching then you're fine. Personally, I do most of my
software development in Classic, but we still run all our experiments
under OS9.

2. we use Attenuator.mex for all our experiments and it has run
perfectly for years. My hesitation in recommending it is that it's not
portable, and should be re-written as pure MATLAB code.

the OSX release of Psychtoolbox is maturing quickly, through the
efforts of Allen Ingling and users like Mario Kleiner. I plan to switch
as soon as it provides the features I need, especially CLUT control,
which is scheduled to arrive later this month.
http://psychtoolbox.org/osx.html#roadmap

good luck

denis pelli
http://psych.nyu.edu/pelli/


On Jan 11, 2005, at 1:35 AM, Joe Hardy wrote:

>
> I have a couple of questions for the community.
>
> 1) How do we feel about running the old psychtoolbox in OS9 mode under
> OSX? I need to use OSX (it's a long story), but I want to use my old
> OS9 experiments.
>
> 2) Has anyone successfully used the Pelli-Zhang attenuator with
> psychtoolbox? The help for attenuator.m indicates that the function is
> under development, but that dates from a few years ago.
>
> Thanks,
> Joe
3
Denis,
 
Thank you for your rapid and clear response to my queries!
 
To follow up on this point about synching; would this mean that cycling through the CLUTs on every "frame" with loadclut would happen at 60 Hz instead of the refresh rate? 

Thanks,
Joe 

Denis Pelli <denis.pelli@...> wrote:
dear joe

1. you can run MATLAB 5.2.1 with the OS9 Psychtoolbox under Mac OS X
Classic. It runs fine in most ways, EXCEPT that there is no way to
synchronize to the display. It all seems to be working, in synch, but
in fact your are synching to an autonomous 60 Hz clock that Apple
substitutes for the actual blanking pulse of your display. If you don't
care about synching then you're fine. Personally, I do most of my
software development in Classic, but we still run all our experiments
under OS9.

2. we use Attenuator.mex for all our experiments and it has run
perfectly for years. My hesitation in recommending it is that it's not
portable, and should be re-written as pure MATLAB code.

the OSX release of Psychtoolbox is maturing quickly, through the
efforts of Allen Ingling and users like Mario Kleiner. I plan to switch
as soon as it provides the features I need, especially CLUT control,
which is scheduled to arrive later this month.
http://psychtoolbox.org/osx.html#roadmap

good luck

denis pelli
http://psych.nyu.edu/pelli/


On Jan 11, 2005, at 1:35 AM, Joe Hardy wrote:

>
> I have a couple of questions for the community.
>
> 1) How do we feel about running the old psychtoolbox in OS9 mode under
> OSX?  I need to use OSX (it's a long story), but I want to use my old
> OS9 experiments.
>
> 2) Has anyone successfully used the Pelli-Zhang attenuator with
> psychtoolbox?  The help for attenuator.m indicates that the function is
> under development, but that dates from a few years ago.
>
> Thanks,
> Joe



Post your message to: psychtoolbox@yahoogroups.com
Please indicate OS9, OSX, or WIN version, and include your full name.
Denis Pelli, David Brainard, and Allen Ingling.
http://psychtoolbox.org


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