[WT-support] Stuttering CW

[Laurent HAAS - F6FVY]

Hi Doug

Doug Grant a écrit :

> I am a new user of Win-Test, and am having problems with "stuttering" 
> CW. I don't have this problem with CTWin.
>  
> I am using LPT1 interface. WinXP running on a 2.4 GHz P4 machine.

(snip)

With such a CPU, the machine speed should not be related to the trouble 
you have. WT is currently used with much lower performances CPU (I just 
read K8BB post few hours ago who is using a Pentium 200 MHz...)

> I looked at the task manager, and there are a lot of things running. I 
> tried changing the priority of wt.exe to real-time and it did not help.

AFAIK, the CW generation is run as the most higher priority available to 
an user program. Higher priorities can be used by some services, 
especially when disk access is involved (meaning that anti-viruses and 
other funny things can compromise the CW generation).

The printer spool service (spoolsv.exe) is also known to sometimes send 
unwanted activity on the LPT port, and should be disabled.

> The only process that seems to run frequently is svchost.exe, and there 
> are several instances of it showing in the task manager.

According to the M$ docs, this process is used by the system. See 
http://support.microsoft.com/?scid=kb%3Ben-us%3B314056&x=4&y=10 for more 
information. BTW, several instances of svchost.exe can run.

> I can only guess that something in the display handling is conflicting 
> with CPU priorities.

Even if I doubt of it, can you see a "CPU peak" of a specific process 
within the task manager when the problem occurs ?

And, in your configuration, is the display adapter on-board (I mean 
buried in the mobo), or is it a graphics card ?

73

Larry - F6FVY