Do you have a Tektronix 4010? Want a screen capture for it?

Richard <legalize at xmission.com> wrote: OK, since you're interested, I'll go into a little more detail of what I was thinking... Snipped: As I understand it the 4631 hardcopy unit is entirely an analog circuitry affair. It generates three input signals to the terminal and the printer support circuitry in the terminal generates a response signal. The hard copy unit generates a "slow ramp" that scans the tube from top to bottom and a "fast ramp" that scans from left to right many times within the slow ramp. This in effect runs a scanning beam in a raster type pattern across the type. The third signal generated by the hard copy unit is a sense signal that is sent to the terminal to read out the tube at the location indicated by the current values of the slow and fast ramps. The terminal sends a response to the hard copy unit, which it uses to turn into an image on a drum with the paper. That is how it appears to work. When printing, you can clearly see the scan lines at work. They are in write-through mode, that is they are not stored. Might be possible to just use a couple of 12 bit DAC's and software scan. I once thought of using a sound card to generate ramps and digitize the tube's analog output signal. Bob