GRASS4 on Cray YML?

[NVG8105 at mvax31.ntou.edu.tw]

Hi,
   It sounds like a crazy idea but I really need to know the answer. Is 

anyone out there running GRASS4 on a Cray YML? Could this be done? 
   So far, I use GRASS4 on a SUN IPC and it's too slow to meet our requirement.
We're going to have a new Cray by the end of the month. So, if possible, we'll
move our work to the new machine. 
Thanx in advance :-)
Mack.
nvg8105 at mvax31.ntou.edu.tw