# IntelMac/Parallels/Psychtoolbox/Sync Problem

**URL:** <https://psychtoolbox.discourse.group/t/intelmac-parallels-psychtoolbox-sync-problem/1491>\
**Category:** Uncategorized\
**Created:** [September 8, 2006, 7:36pm UTC](https://psychtoolbox.discourse.group/t/intelmac-parallels-psychtoolbox-sync-problem/1491 "2006-09-08T19:36:27Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\
**Post date:** [September 8, 2006, 7:36pm UTC](https://psychtoolbox.discourse.group/t/intelmac-parallels-psychtoolbox-sync-problem/1491/1 "2006-09-08T19:36:27Z")

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The current version of MATLAB has some issues when trying to run it on the Macbook or   
Macbook Pro. To circumvent these issues I installed Parallels and Microsoft Windows XP on   
my Macbook. I was able to get MATLAB working in Windows via Parallels without any   
problems. The problem I'm having is with Psychtoolbox. I was able to install Psychtoolbox   
BUT when I tried to run one of the demos an error message reported that the   
"synchronization of psychtoolbox to the vertical retrace (VBL) is not working on my setup."   
  
Has anybody else had this problem? I imagine that this is because I'm running Matlab and   
Psychtoolbox in Parallels and the Microsoft Windows software isn't reading the refresh rate of   
my Macbook. Is there anything I can do to fix this?  
  
Thanks,  
Aaron

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**Author:** ![mariokleiner](https://avatars.discourse-cdn.com/v4/letter/m/13edae/32.png) [@mariokleiner](https://psychtoolbox.discourse.group/u/mariokleiner)\
**Post date:** [September 10, 2006, 5:26pm UTC](https://psychtoolbox.discourse.group/t/intelmac-parallels-psychtoolbox-sync-problem/1491/2 "2006-09-10T17:26:22Z")

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Read message 4648 for explanation. Apart from that, afaik the only  
problem with Matlab on IntelMac is lack of Java support, so GetChar  
and other Java based Matlab features won't work.  
  
-mario  
  
--- In [psychtoolbox@yahoogroups.com](mailto:psychtoolbox@yahoogroups.com), "aaronmattfeld"  
\<aaronmattfeld@...\> wrote:  

> \>  
> \> The current version of MATLAB has some issues when trying to run it

on the Macbook or   

> \> Macbook Pro. To circumvent these issues I installed Parallels and

Microsoft Windows XP on   

> \> my Macbook. I was able to get MATLAB working in Windows via

Parallels without any   

> \> problems. The problem I'm having is with Psychtoolbox. I was able

to install Psychtoolbox   

> \> BUT when I tried to run one of the demos an error message reported

that the   

> \> "synchronization of psychtoolbox to the vertical retrace (VBL) is

not working on my setup."   

> \>   
> \> Has anybody else had this problem? I imagine that this is because

I'm running Matlab and   

> \> Psychtoolbox in Parallels and the Microsoft Windows software isn't

reading the refresh rate of   

> \> my Macbook. Is there anything I can do to fix this?  
> \>   
> \> Thanks,  
> \> Aaron  
> \>