I've just taken some parts of alpha/tc/zs_ioasic.c and
put together a kernel for the DS5000/240 which uses the mi
zstty as serial console:

> zsc0 at ioasic0 offset 0x100000 priority 6
> zsc0: channel 0 not configured
> zsc0: channel 1 not configured
> zsc1 at ioasic0 offset 0x180000 priority 5
> zstty0 at zsc1 channel 0
> zstty1 at zsc1 channel 1 (console)
but later of course:
> Can't configure keyboard/mouse
>  (mouse/keyboard config failed)

It would be probably not too hard to adapt the LK201 / mouse
too. (using Takuya Koumoto's work for the alpha)

So is it a reasonable goal to replace the scc driver,
or are the reasons (performance?) to stick with it?

best regards
Matthias