2.3.3.2 Refresh Rate (#F)

The Refresh Rate command gives the user the ability to change the refresh rate of the CRT. This allows stimuli to be presented for much shorter durations than would be otherwise possible. The Refresh Rate takes a single argument which specifies the approximate time in milliseconds per frame.

Warning: This command reprograms the video adapter to overdrive your monitor. It will only work on a fixed frequency monitor; a multisynchronous monitor will either display noise, report that video input is invalid, or start to make high pitched whine and subsequently explode. Even on a compatible fixed frequency monitor, prolonged display at high refresh rates will damage the CRT. It is therefore recommended this command be used with some caution.

Name:

Refresh Rate

Class:

Video Control

Code:

#F

Syntax:

#Frate
rate must be an integer from 2 through 10.

System:

Switches display frequency to approximately rate milliseconds per frame.

Requires:

This command only works on fixed frequency monitors.

History:

In Cogsys 2.x, a `#F' was used to set fast refresh graphics mode, and the now-defunct `%E' was required for text modes. The Cogsys 3.x #F correctly works in any mode.

Test Files:

`REFR_T01.IN'

tests basic operation

Examples:

input

#F5hi from fast refresh mode#W3000#F0

cogsys

Switches into fast refresh mode, screen updates every 5 ms, 200 Hz. The text `hi from fast refresh mode' is displayed for 3 seconds, then video is returned to normal refresh rate (usually, 60 Hz).