[X-HW] OSX and Formac Proformance

[Are Hansen]

I have a 400 MHz G4 AGP. The problem is the video card: Formac 
Proformance. It runs an old 24" Sony W900 at 1600 x 1024 resolution.

But when booting in OSX, the machine freezes, while the big gray apple 
and the rotating "fan" is still onscreen. The same happens when booting 
from OSX install discs.

Searching the net, I found a solution: go in to Terminal, and key the 
following:

sudo nvram boot-args="romndrv=1"

But there is a Catch-22 here: I can only do this by booting in OSX! So 
I disconnected the Sony, put in the original AGP-card, attached a 
smaller screen and booted happily in OSX. Attached the Sony screen 
again, and did a restart. Then both screens showed up in the Monitors 
control panel, and I could select the Sony as the main screen. Powered 
down and removed the AGP-card and small screen.

All very well, except: after booting from OS9 and then going back to 
OSX I have to do the whole rigmarole again.....   :-(

Anybody else have experience with the Proformance card? There are no X 
drivers from Formac, amd none forthcoming. Any solution for this 
problem? I do need to boot in OS9 occasionally.

Help!