Dec 252017
 
Changes the scan rate of your PS/2's monitor for video and photographic applications.
File VISYNC.ZIP from The Programmer’s Corner in
Category Display Utilities
Changes the scan rate of your PS/2’s monitor for video and photographic applications.
File Name File Size Zip Size Zip Type
48HZF2.COM 2373 313 deflated
60HZF1.COM 703 434 deflated
60HZF2.COM 2313 282 deflated
READ.ME 4922 1731 deflated

Download File VISYNC.ZIP Here

Contents of the READ.ME file





09/29/87
Synchronization of Personal Systems 2 family
with Film and motion picture cameras.



Contents


Assumptions ............................................ 2

Installation on to internal disk ....................... 3

Usage .................................................. 4

Limitations ............................................ 5
Programming ............................................ 5
Additional information ................................. 5
Film ................................................. 5
Video ................................................ 5
Outside consultants .................................... 6




Contents 1


ASSUMPTIONS



1. DOS 3.2 or later

2. Basic understanding of the use of DOS commands.





Assumptions 1


INSTALLATION ON TO INTERNAL DISK



1. Enter in the following

copy a:\*.* c:\*.*

Note: The selected program can be loaded via the
"AUTOEXEC.BAT", please read on.





Installation on to internal disk 2


USAGE



The IBM Personal Systems models 50, 60, and 80 monitors
scan at a 70 hertz scan rate. By loading one of the
following programs it is possible to change this scan rate
depending on the need.

There are 3 programs on the diskette:

1. 48hzf2 (48hzF2.com)

Changes scan rate on the monitor to 48 hertz, allow
shooting at 24 frames per second. This is for only Models
50, 60, and 80 systems. Models 25 and 30 can not operate
at this scan rate without special hardware considerations.


2. 60hzf1 (60hzF1.com)

Changes scan rate to 60 hertz for use with video
cameras. This is for only Models 25 and 30.

3. 60hzf2 (60hzF2.com)

Changes scan rate to 60 hertz for use with video
cameras. This is for only Models 50, 60, and 80 systems.


In order to select the desired program enter in either
48hzf2 or 60hzf2 at the DOS prompt, depress enter. Once
either one of these programs has been entered or executed
the scan rate will be changed. The program will then
remain in the system memory as a device driver.

In order to change to another scan rate or to cancel the
selected scan rate it will be necessary to power off the
system and to start over again. The program need only be
entered once after initial loading of DOS. It can be
loaded as part of an "AUTOEXEC.BAT" file. Repeated loadings
will be ignored and will do nothing more than consume
memory space.



N O T E
Programs need only be loaded
once,...and remain in effect
until the system is powered
off.






Usage 3


LIMITATIONS



These programs will change the scan rate of the system to
the selected rate. The following considerations must be
made.:





PROGRAMMING


If the program that is displaying the information on the
screen is changing the screen resolution modes,
synchronization will be lost. Therefore, it is important
that one resolution be selected and used throughout. If it
is necessary to change resolution modes these changes must
be made off camera.





ADDITIONAL INFORMATION





Film


When shooting a single system the camera must be
synchronized with the camera's shutter prior to
photographing the system. When the system is not in sync
with the camera there should be a black line or stripe that
is visible.

Momentarily stop/start the camera to bring it into sync..

It probably will not be possible to show more than one
system at a time using this technique.




Video


Any rapid movement will produce a fine horizontal black
line on the screen. This would be noticeable on the video
camera's monitor. Examples zooming, fast panning.






Limitations 4


OUTSIDE CONSULTANTS


THe following are a few situations where the use of an
outside consultant may be advised:

1. To eliminate manual synchronization of camera to system

2. When shooting on film, multiple systems





Limitations 5


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