Re: Reccomending a monitor?

[mjmahon@aol.com (Michael J. Mahon)]

David Stark wrote:

>Many TVs today have higher resolutions than what was available when your 
>Apple ][ was in its hey day.  My Wega has a couple of high definition 
>modes.  I would bet that it would work with an 80-column card or other 
>graphics card that you might have (provided that the output is still 
>composite NTSC)

Although the comb filters of modern sets allow a somewnat greater
luminance bandwidth than the older sets, they do not allow enough
bandwidth to produce a good 80-column display.

All NTSC TV sets must roll off the video passband around 4MHz,
to avoid getting the sound subcarrier (at 4.5MHz) in the video.

Older sets rolled off before 3MHz, to keep the 3.58MHz color
subcarrier from being annoyingly visible.

A sharp 80-column display, with isolated dots about as bright
as horizontally adjacent dots, requires bandwidth in excess of
10MHz.  (In fact, the dot frequency of 80-column pixels is 14MHz.)

>Might be fun to hook your old Apple up to a 32" screen and load up some 
>of those old arcade games.

They will loolk great, since they were designed to be viewed on
composite monitors or TVs.

-michael

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