Installation guide

• BSD Curses

G.4.1 ULTRIX Migration Issues

Because X/Open Compliant Curses, Issue 4, is backward compatible with

earlier versions of X/Open Curses, there are no ULTRIX migration issues.

G.5 X11R6

This release of DIGITAL UNIX supports Release 6 of the X Window

System, Version 11 (X11R6) patchlevel 12. Prior versions of the operating

system supported Release 5 (X11R5) patchlevel 26.

The DIGITAL UNIX port of X11R6 supports all the features and

functionality of previous releases of DIGITAL UNIX. It also supports all X

Consortium standard features of X11R6.

The following protocol extensions are new features in DIGITAL UNIX

Version 4.0B:

• BIG-REQUESTS. Gives clients the ability to use requests that are

arbitrarily large, rather than being limited to the size restriction of the

core protocol. This can result in a signiﬁcant performance improvement

for applications that use large requests.

• DOUBLE-BUFFER. Enables double buffering, using the new X

Consortium standard.

• XIE (updated). Complete implementation of full XIE 5.0 protocol with a

few exceptions.

• XKEYBOARD (XKB).

G.5.1 X Keyboard Extension for X11R6 (XKB)

The XKB (X Keyboard) server extension is new for X11R6 and for DIGITAL

UNIX. XKB enhances control and customization of the keyboard under the

X Window System by providing the following:

• Support for the ISO9996 standard for keyboard layouts

• Compatibility with the core X keyboard handling (no client

modiﬁcations are required)

• Standard methods for handling keyboard LEDs and locking modiﬁers

such as CapsLock and NumLock

• Support for keyboard geometry

In addition, the X11R5 AccessX server extension for users with physical

impairments has been incorporated into the XKB server extension. X11R5

G–4 Migration from ULTRIX Version 4.5 to DIGITAL UNIX Version 4.0B