fg(4) — VAX
Name
fg − VCB03 - Midrange VAX color video subsystem
Syntax
device fg0 at ibus? flags 0x0f vector fgvint
Description
The VCB03 is a high-performance, full-page, double-buffered video subsystem capable of Z-buffering. The device consists of a 2048 bits wide x 2048 bits long x 8 or 24 plane frame buffer, a set of proprietary video chips for bitmap modification and video output, onboard VAX CPU and floating point accelerator, a 3D Transformation Engine, 1280 wide x 1024 long 19-inch color video monitor, keyboard, and a mouse or tablet.
The subsystem device driver supports a hybrid terminal with three minor devices. The first device emulates a glass tty with a screen that appears as a 80-column by 60-row page that scrolls from the bottom. This device is capable of being configured as the system console.
The second minor device number is reserved for the pointer. This device is a source of pointer state changes. (A state change is defined as an X/Y axis pointer movement or button change.) When opened, the driver couples movements of the pointer with the cursor. Pointer position changes are filtered and translated into cursor position changes in an exponential manner. Rapid movements result in large cursor position changes. All cursor positions are range checked to ensure that the cursor remains on the display.
The third minor device is opened in the raw mode by default. Opening the third device makes the driver function like a pseudo-tty in that the output destined for the first minor device is channeled to the third instead.
The Hold Screen key is supported. The driver treats this key as if CTRL/S or CTRL/Q is typed. Pressing the Hold Screen key suspends the output if it is not already suspended. The output will be resumed by pressing this key again (if the output was suspended).
Files
/dev/console
/dev/fg0
/dev/fgscreen