Hi All, Thanks for the info on programming the 1350. I picked up another one of these HP vector displays, a type 1347 (I think), at a surplus store. It sounds pretty similar to the 1350 except that the display tube is built in to the device. I think that HP used these displays in quite a few of their spectrum analyser instruments to generate the fancy displays that are required for frequency domain analysis. The 1347 was available in either free-standing cased form or as an open cage that could be integreted into third party instruments. 3 BNC connections on the rear panel allow you to drive an external XYZ display if you need to. I'll have a try drawing some pictures using the programming information that has been posted and let you all know if the commands are the same. Cheers Peter _________________________________________________________________ Get Hotmail on your mobile phone http://www.msn.co.uk/msnmobile