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General description
Charon-AXP supports emulation of PBXGA graphics card(s) by direct virtualization and provides a virtual console for displaying graphics.
The console starts automatically upon starting the emulator. Its resolution is 800 x 600 by default.
Support for AXP graphics is provided with two components:
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On Charon startup a window will appear on CHARON host monitor to display graphics.
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All the parameters described in the "Placement of peripheral devices on PCI bus" chapter, such as "bus", "device", "function", "irq", "irq_bus" are applicable for PBXGA graphics card.
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Configuration parameters
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application
| Parameter | application |
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| Type | Text string |
| Value | Specifies the application to open for displaying the emulated graphics device. The pbxga_tv executable file is provided for this. It is located in the same folder as the Charon emulator executable file. Syntax:
Example:
There is no need to supply display size to PBXGA_TV application. Using PanoramiX/XINERAMA extensions to DECwindows is also possible (topics of proper configuration OpenVMS/Tru64 are not covered here). These extensions allow to join multiple heads in one big virtual screen. The PBXGA_TV virtual display unit has special notation allowing to consolidate multiple frame buffers in single window (topology is flexible, to some extent):
Example:
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Using PBXGA_TV
General Information
The PBXGA_TV display unit starts in passive mode. It displays content of frame buffer but does not react on keyboard input and/or mouse movements. In order to switch it to active mode, place mouse cursor with the window and click once. When PBXGA_TV is active, mouse cursor is stuck to PBXGA_TV window. Press CTRL+ALT+R to release.
The PBXGA_TV display unit starts in Window Mode. Use CTRL+ALT+F to toggle Full Screen Mode.
The PBXGA_TV application uses the SDL2 library to draw its window. The PBXGA_TV driver is statically linked with SDL2. You may need to install the "libdecor" package additionally.
Running PBXGA_TV remotely is not supported.
Please note: PBXGA_TV can only consolidate multiple screens from a single emulator instance.
Command-Line Parameters
The "pbxga_tv" application accepts the following parameters:
| Parameter | Description |
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| Specify the configuration-name in the emulator configuration file |
| Specify the device-name in the emulator configuration file |
--guest-os <GUEST>-Tru64-OpenVMS | Specify guest operating-system running in emulator. Values for |
-u,--screen-update-period-ms <PERIOD> | Screen update period in milliseconds. If omitted, the default is 100 |
Multiple Screens
The PBXGA_TV application supports using multiple PBXGA adapters in screen consolidation mode, provided that guest OS is configured for PANORAMIX/XINERAMA extension. In order to join multiple PBXGA displays in a single window the value of device-name must list the desired device names as follows:
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Examples
Example 1: 8-bpp graphics on AlphaServer 400
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Example 2: 24-bpp graphics on AlphaServer DS20
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Example 3: two display units, running independently
... load PBXGA_BA GYAset GYA application = "pbxga_tv -c MYCONF -n GYA"load PBXGA_BA GYB size = 1280x1024set GYB application = "pbxga_tv -c MYCONF -n GYB" |
In the above example, display units have different resolutions.
Example 4: dual head display, 2x 1280x1024
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Example 5: triple head display, 3x 1280x1024
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Example 6: Two screens consolidated in a column in one window
... load PBXGA_BA GYAsize = 1280x1024load PBXGA_BA GYB size = 1280x1024set GYB application = "pbxga_tv -c MYCONF -n GYA/GYB" |
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