On 24-Feb-98 Nathan Gelbard spoke unto us all:
# In my Sparc ELC saga...
# 
# (i'm booting via serial console because I have no keyboard as of yet)
# 
# bwtwo0 at sbus0 slot 3 offset 0x0: SUNW,501-1561, 1152 x 900
# bwtwo0: attached to /dev/fb
# 
# This is correct, but when it hits this my screen goes into what looks
# like a mode that is 'out of sync' with what it should be running at.
# Shakey horizontal lines (light grey).
# 

I had this problem on my sparc1 when I tried to boot with no memory in bank 0. 
It just refused to come up at all however like that.  Perhaps it is trying to
indicate a problem of some sort.

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Tim Rightnour    -  root@garbled.net
http://www.zynetwc.com/~garbled/garbled.html