Boot floppy for TC Alpha with keyboard support is available.
It would be usable for maintenance, too. Kernel image with
keyboard and mouse support is available too. With these, you
can install the latest snapshot without serial console. See:

  http://sakura.aist-nara.ac.jp/Japanese/student/takuya-k.html

Then, does anyone have good idea to support X11 for sfb?

Thanks,

Takuya