Help! A great problem accured!

#1
Hello!
Excuse me, my English was very poor.Perhaps somthing I can't express in a clear way,And I hope anybody who know what I said will do me a faver,please.Thank you.
I'm an intellCAD user in china.There is a great problem appeared when I use intellCAD to print an A1 or A0 paper sereval days ago.The graphics that output on the paper just printed one-half parts at last.The other part was disppeared. But there's no problem in A2,A3,A4. Why did it happen? If that any misstakes has been done in my operation?
please help!
my Operation: Win98
printer: HP 650C
note:There're no problem when I use autocad to print A1,A0 in the same computer.