VT100 Character ROM image

Simpler, perhaps - but, I believe, wrong. Consider this quote: The VT220 display was refreshed at 60 Hz, which is slow by today's standards. This slower refresh rate required a slower phosphor on the CRT, or users would notice flickering. However, slower phosphor means slower to light up as well as slower to fade, and this slow rise time would make single pixels almost invisible. The first two sentences are fine, as is the first half of the last sentence, but the second half of the last sentence is wrong. It's confusing two different rise times. In each case there is an input step signal and a somewhat smoothed output signal whose rise time is of interest, but they are totally different. In one case, the input is electrons hitting the phosphor and the output is light generated. In the other case, the input is the signal from the character generator circuitry and the output is the voltage controlling the intensity of the electron beam. The former is related to phosphor persistence; the latter is related to how much smoothing is inflicted on the signal by certain pieces of circuitry and has nothing whatever to do with phosphor - indeed, it can be applied to any amplifier or transmission line. Stating that there is a direct causal link between them, as the part of the above quote after the last comma does, is just _wrong_. /~\ The ASCII der Mouse \ / Ribbon Campaign X Against HTML mouse at rodents.montreal.qc.ca / \ Email! 7D C8 61 52 5D E7 2D 39 4E F1 31 3E E8 B3 27 4B