DEC VT240 terminal
ard at p850ug1.demon.co.uk
Thu Aug 23 14:11:32 CDT 2007
> > 1) One site i looked at said a VT240 is a monochrome unit, a VT241 is the
> > colour version. Is the only difference the monitor? Can I use a colour
> > monitor with my base unit?
> Doubtful. The electronics for color cost significantly more than the
> electronics for grayscale.
Why? Assuming the same number of bits-per-pixel, and the same total
number of physical colours available, then almost all the circuitry --
grpahics controller, RAM, CLUT, etc -- would be the same. The only
difference would be in the final DAC stage between the output of the CLUT
and the monitor.
It comes down to, say, a single 8-bit DAC for a greyscale display and 3
separate DACs, say 2 off 3 bit and 1 off 2 bit for colour. I am not
convinced the latter is significantly more expesnive.
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