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COMPAQ 450 and 440 Monitors: What are they?

I  have a couple of Compaq monitors at the moment, which  may  be 
going back to the person who sold them to me.

One  is  a  17" (Model 450) and the other  15"  (440).  They  are 
possibly badged NEC 5Gxx and 3Gxx 's?

Each has a row of 6 pairs of buttons under the screen for 2 pairs 
for vertical and horizontal position, one pair for vertical  size 
and  one  pair for horizontal size. the others are  contrast  and 
brightness.

The horizontal and vertical size controls seem to auto adjust for 
pin-cushioning to a degree.

They have 5 BNC connectors.

Problem  is  that  I don't know for  sure  what  their  frequency 
capabilities are, and whilst they seem to be FST, the image  also 
seems  to  bow inwards, particularly  noticeable  in  spreadsheet 
displays.

Can anyone tell me if this is normal?

Are they microprocessor controlled.

How good are they?

-- 
David Longley