Re: 12" apple RGB monitor question

[a_specto@alcor.concordia.ca (Mitchell Spector)]

On Tue, 10 Jul 2001 18:53:02 -0500, Roy Miller
<millers@iliveinnetnebr.com> wrote:

>Mitchell Spector wrote:
>
>> wbdesnoy@acs5.acs.ucalgary.ca (Byron Desnoyers Winmill) wrote:
>>
>> >Why it appears so poorly on a Mac while it is fine on a IIgs is for
>> >somebody with more experience than I to answer (but I'm guessing that
>> >the course graphics on the IIgs has something to do with it).
>>
>>     The two main reasons have to do with interlacing and resolution.
>> The IIgs uses the display in a low-resolution of 320x200 or 640x200
>> whereas the Mac 640x400, but the difference here is *interlaced*
>> video versus non-interlaced. Interlaced video flickers quite a bit
>> and very uneasy on the eyes, to say the least.
>
>Now *I* have a question. I've attached my IIgs monitor to my Apple /// and got
>the /// to use it's interlaced mode

    Interesting, as the Apple III doesn't have an interlaced mode. :)
The Apple III Plus does though, which is activated by flipping a
switch on the side of the case.

    Apparently there was a (third party?) upgrade kit for the original

Apple III to add interlaced video, perhaps you have that installed?

>which gives (as I recall) 16 colors with a 512 by c. 400 line screen

    I remember it doubled the vertical resolution, so it would
actually be 240x384 and 560x384 interlaced. 

>and it looked just *fine*! I saw no flickers, and
>the display was (obviously) MUCH better than the green screen of the Monitor
>///.

    Depending on the screen image, the interlace effect can be less
noticeable at times than others. Anything with lots of fine horizontal
lines will flicker much more intensively. What did you look at, a text
or graphics screen incidentally?

    One important thing to keep in mind, regardless of interlacing,
is the color information won't be correct (greens may be blue,
reds may be yellow, or several colors may show up as yellow.
Not that exactly, I'm just giving you an idea of what happens
using an analog RGB on something that outputs digital).

Mitchell Spector
a_specto@alcor.concordia.ca