Specifications

EPC-8 Hardware Reference
I I
I-6
Centering adjust
Centering is available while in Video Modes Preview (only for extended Graphics
modes 58h and greater). While in Preview, you have the option to use the
Right/Left/Up/Down arrow keys to adjust your screen accordingly. The screen
adjustments have predefined limits, and in some cases, the limit for the right side
adjustment for some modes will have already been reached when entering the Preview
mode. In that case, no right side adjustment will be allowed. Once a mode has been
adjusted, the new values for horizontal and/or vertical positioning are saved within
CLMode. When exiting from CLMode, you are prompted on whether you want to
save these new parameters to TSR (CENTER.COM). If you choose to do this, the
values to be used for the adjusted modes are stored in CENTER.COM on exit.
CENTER.COM can then be loaded outside of CLMode. Once this is accomplished,
all the modes which you have adjusted will be the active modes set when that mode
request is made. To unload CENTER.COM, you must change the MONTYPE
currently set in CLMode. This will unload CENTER.COM and uninstall all
centering adjustments previously redefined. To save new centering adjustments for a
different MONTYPE, repeat the above procedure as before. Your new adjustments
will be written into CENTER.COM over the previously defined adjustments.
An additional adjustment for monitor SYNC POLARITY is also available while
centering is active. To adjust the polarity of the current mode, simply press the PgUp
or PgDn keys (while in Preview) to cycle through the available options, (Vertical Sync
Polarity/Horizontal Sync Polarity):
+/+, +/-, -/+, -/-
Note: Centering will not be allowed if CENTER.COM has been loaded. You must
unload CENTER.COM before attempting to save new adjustments.
Limitations: You may only adjust and save 16 modes at a time to CENTER.COM.
You must use BIOS version 1.30 or greater or centering will not be made available.
Retrieving the current controller status
The information in the main window displays the controller type, the BIOS version
number and the amount of video memory present.
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