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Re: It works! IIgs RGB on PS-one LCD



Jeff Blakeney wrote:
On Tue, 22 Mar 2005 00:24:47 GMT, David Murray
<spamsucks@stopspam.com> wrote:


I do not believe it has that resolution. I can see the physical pixels very clearly when I look closely. The vertical resolution is matching up perfectly to the signal sent by the IIgs. The horizontal looks okay in 40-column mode, but in 80-column mode you can quite clearly tell that every-other pixel is missing. It is still readable, however.


It could still be a 640x480 LCD screen.  The problem you are most
likely running into is all the wasted screen space that is being used
up by the border.  The menu bar in your screen shot is 640 pixels wide
but it is only using about 80% of the horizontal width of the screen.
If the screen is only 640 pixels wide, which includes the pixels for
the IIgs border, then you are trying to display the 640 non-border
pixels in about 512 of the LCD screen's pixels and therefor will be
losing some pixels.

Now, if we could just turn off the border or at least reduce its size,
you'd get an even better image on that screen.

That wuld have to be done by modifying the PS-one display to
digitize at a higher pixel rate and doing so only within the
40 microsecond Apple II display "window".

I have no idea how feasible such a change to the display would be.

-michael

New Applesoft BASIC interface for NadaNet networking!
Home page:  http://members.aol.com/MJMahon/