That message using setpageparams was right.
But, if you are using PageMaker 2.0 or 3.0 on the Mac there is an easy way.
On the File:print screen in PageMaker, click on Change and select Linotronic
as the target printing device and tabloid as the paper size.
Note that you must have the Linotronic.apd file in your system folder to
work.
I'm glad that you got it to work. I didn't realize that the file you were
trying to print at a larger size was in PageMaker. PageMaker and Xpress give
you the most control over page size.