The replacement is more compatible with the equivalent subsystem used on SPARC based systems. Therefore, it provides for future extensibility. It invalidates a large number of undocumented and unsupported interfaces, as well as some documented interfaces.
The following documented interfaces may no longer be supported in a future release:
If you want to program the keyboard, use loadkeys(1) instead of pcmapkeys(1). In console mode, there will no longer be a mechanism to load a different font in the video card. The only available font is ISO8859-1
The following undocumented and unsupported interfaces may no longer be available in a future release:
ioctls listed in /usr/include/sys/kd.h
ioctls listed in /usr/include/sys/vt.h
Support for Virtual Terminals
/dev/vt* special files to support virtual terminals
The terminal type for the console will be "sun-color" rather than AT386.