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- SVGA 1.10 Manual Addendum
- -------------------------
-
- This addendum documents changes since the SVGA 1.10 manual went to press.
-
- 1.11 Added the SVGATEMP environment variable. Previously, SVGA would
- use the TEMP variable setting (if valid) for its virtual memory
- path. SVGA now uses SVGATEMP, then TEMP, then the current
- directory.
-
- 1.12 Added /i command line switch. This switch instructs SVGA to start
- up in the currently operational video mode, rather than switching
- to the standard 80x25 text mode. Pressing F7 at the file display
- screen will toggle between the initial video mode and the standard
- 80x25 mode.
-
- Added /g command line switch. This switch instructs SVGA to not
- use graphical characters on a VGA display. This was added due to
- incompatibilities with some video adapters.
-
- Added /s command line switch. This switch tells SVGA to exit to
- DOS when single image viewing is complete. Default behavior is
- to run the standard user interface after single image viewing.
-
- Added ability to specify path or image name on the command line for
- automatic path selection or image viewing on startup.
-
- Additionally, 4DOS descriptions of up to 120 characters in length
- are supported in accordance with the specification listed in the
- 4DOS 4.0 manual.
-
- The following command line format replaces that stated in the
- manual:
-
- SVGA [/sbgadrvi4] [/x xres] [/y yres] [/p path] [path/fname...]
-
- The /s option selects single image viewing mode.
- The /b option selects BIOS for screen I/O rather than direct screen
- writes.
- The /g option disables text mode character graphics.
- The /a option selects automatic resolution selection at startup.
- The /d option selects display of 4DOS descriptions at startup.
- The /r option selects file list image resolution display at startup.
- The /v option selects the VESA interface if VESA is installed.
- The /i option uses the current video mode at startup.
- The /4 option selects 43/50 line mode at startup.
- The /x and /y options specify the largest allowable display mode at
- startup.
- The /p option specifies the path SVGA should switch to at startup.
-
- All command line switches are optional, and may be specified in any
- order.
-
- Only command line switches may be set in the SVGA environment
- variable. Specifying a default path requires the /p switch.
-
-
- Troubleshooting
-
- Adapters based on the Cirrus Logic CL-GD542x graphics controllers
- may not function correctly in VESA modes when more than 2MB of
- video memory is installed. This is due to a bug in the Cirrus Logic
- BIOS in which the bank switching code does not check the alternate
- banking bit, and accordingly does not alter it's addressing method
- to accomodate addressing the extra memory. The result is banding and
- overlapping of the image. There is no workaround at this time for
- VESA support. SVGA fully supports the Cirrus Logic family in native
- mode, however.
-
-