I tried to boot with GENERIC-34 today on my Quadra 650.
After it cleared the screen this is what I got:
[ preserving 310545 bytes of netbsd symbol table ]
System RAM: 33554432 bytes in 8192 pages
  Low = 0x0, high = 0x2000000
no internal video at address 0 -- videoaddr is 0xf9000080

After that it just sat there...
Xiamin