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sg(4)									 sg(4)

Name
       sg - Small VAX color video subsystem

Syntax
       device sg0 at uba0 csr 0x3c000000 flags 0x0f  vector sgaint sgfint

Description
       A  small	 VAX  color video subsystem provides a half-page or full-page,
       user-accessible bitmap display for graphics applications.   The	device
       consists	 of  a	128-Kbyte  block of dual port RAM, a VSXXX-AA mouse or
       VSXXX-AB tablet, and a 19-inch video monitor.

       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 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 number is reserved for the mouse.  This device
       is a source of mouse state changes.  (A state change is 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 exponen‐
       tial 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.

       If  there  is  not  a  special  cable (BCC08) on serial port 3 (printer
       port), the system will then use the color video as the system  console.
       All  input/output destined for will use the color video instead.	 (This
       is done by overwriting the device switch tables.)  There	 is  a	second
       set  of	device	switch entries configured that may be used as an addi‐
       tional terminal, (hardwire, modem, or autodialer) connection,  or  user
       dial-up access. For further information, see

       The  Hold  Screen  key  is supported. The Small VAX color 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
See Also
       ss(4), ttys(5), MAKEDEV(8)

				      VAX				 sg(4)

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