Under a -current kernel, and rebuilt 3.3.5 xsrc, the sparcbook nipple
mouse has developed severse spastic autism. Has anyone else noticed
this? It's also not immediately apparent if there is any device support
for the trackball port, which I presume is zstty device, but between
the two serial ports and zs1, there doesn't seem to be anything left.

zs0 at obio0 slot 0 offset 0x100000 level 12 softpri 6
zstty0 at zs0 channel 0
zstty1 at zs0 channel 1
zs1 at obio0 slot 0 offset 0x0 level 12 softpri 6
kbd0 at zs1 channel 0 (console)
ms0 at zs1 channel 1