qd(4)
NAME
qd − VCB02 (QDSS) video subsystem
SYNTAX
device qd0 at uba0 csr 0177400 flags 0x0f vector qdkint qdvint
DESCRIPTION
A VCB02 provides a half or full page user accessible bit map display for graphics applications. The device consists of a 256kb Q22 bus memory array, a 15 or 19 inch video monitor, and a VX10X-EA mouse.
The model supported by the driver is a hybrid terminal with three minor devices. The first device emulates a glass tty with a screen that appears as a 120 column by 80 row page that scrolls from the bottom. This device is capable of being configured as the system console. The second minor device is opened in the raw mode by default. Opening the second device makes the driver function like a pseudo tty in that the output destined for the first minor device is channeled to the second instead. Input and output on the first two minor device numbers are processed by the standard line disciplines.
The third minor device number is reserved for the mouse. This device is a source of mouse state changes. a state change defined as an X/Y axis mouse movement or button change). When opened, the driver couples movements of the mouse with the cursor. Mouse 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 insure that the cursor remains on the display.
If there is a VCB02 module at the standard address the system will use it as the system console. All input/output destined for /dev/console will use the VCB02 instead. This is done by overwriting the device switch tables. There is a second set of device switch entries configured for the console which may used as an additional terminal or printer port by making a special device file using major number 38 and minor number 0 and making the appropriate entry in /etc/ttys.
FILES
/dev/qd? /dev/qconsole