Need help with connecting Laserwriter 1+ (PROM problem)

[currey tom 76327]

I have a problem I hope someone can help.  I have a Laserwrite 1+ without
the manual.  I need to hook it up to a Sparcstation 1 using xon/xoff
protocol.

I had a script to change the printer to do this.  Sent it to the printer.
The yellow light flashed and flashed and flashed.  I thought something was
wrong with it, then the power went out.  When the power came back on I
could not do anything with the printer.

The startup test page comes out, but I still can't print.  If I try to
send the script again. the yellow light doesn't flash.   The cable is a
null modem cable and data can be sent across it fine.

How can I fix this?  Is the PROM trashed?  Any help is greatly thanked