HP 7580A questions

[Tony Duell]

> 
> I dug up a HP 7580A and hooked it up, it seems to work fine.
> But the question is now, how do I make it do anything, WITHOUT a system ?
> Pressin pen down doesn't do much, and although I can move left and 
> right I cant make it move the paper forward and backward.

Are you saying these functions do work correctly from the computer 
interface (in other words you can send it (presuambly) an HPGL file and 
get it to plot it correctly?).

If so, have you checked that that the frontpanel buttons are actually 
making proper contact?

-tony