Re: IIgs RGB to YPbPr Component experiment

["Bryan Parkoff" <nospam@nospam.com>]

"jsnospam@cimmeri.com" <js@cimmeri.com> wrote in message 
1151018833.080486.98960@i40g2000cwc.googlegroups.com">news:1151018833.080486.98960@i40g2000cwc.googlegroups.com...
>
> Following up to earlier posts from Scott Alfter, Michael Mahon, and
> myself, I went ahead and conducted further research on this subject.  I
> found a solution that produces very nice results.  But nothing worth
> having is free in this world.
>
> 1.  I obtained a very nicely crafted IIgs -> SCART cable from Roger
> Johnstone (frequent poster here).
>
> 2.  From the U.K., I obtained a Keene Electronics Aptus1 SCART RGB ->
> YPbPr conversion box.  Time is money to me and I didn't have time to
> spend hours constructing something that would be functional but still
> look like dog doo.
>
> 3.  Received both.  Plugged Roger's cable into my IIgs, then into the
> Aptus1.   Used some cheapo component cables from the Aptus1 to my
> Samsung 192MP 19" LCDTV 1280x1024 native resolution.
>
> 4.  Press "Source" button twice on the 192MP remote control, and I had
> beautitful color RGB on my LCD.      Press Source twice more, back to
> PC.
>
> Time spent hooking up: 2 minutes.
>
> See links for photos.  I had a hard time holding camera steady enough
> for these... so any blurriness is from my photography, and the actual
> vividness is better.    Interestingly, the HGR modes showed perfectly
> solid colors, whereas the GSOS desktop showed intersticed black lines.
> Probably has to do with the upconversion process.
>
> GR graphics mode:
> http://jws.oldspirit.net/IIgs/RGB1.jpg
>
> HGR mode:
> http://jws.oldspirit.net/IIgs/RGB2.jpg
> http://jws.oldspirit.net/IIgs/RGB3.jpg
> http://jws.oldspirit.net/IIgs/RGB4.jpg
>
> GSOS desktop (SHGR 640x200?)
> http://jws.oldspirit.net/IIgs/RGB5.jpg
>
>
> Future tests:
> - I plan to test with a 640x480 LCD EDTV to see if that produces better
> 640x200 displays.
>
> - the Samsung 910MP seems to come with a SCART connector already built
> in, thus saving you having to buy an APTUS1 and a more tidy cable
> situation.  I have not tried this option but I might.
>
> ~ J
>
J, Hello...

    Are you using a cable adapter from video composition connector or Apple 
IIgs' RGB connector to LCD screen?
    I think that it is the problem with video clock.  It has to lock every 
14 cycles so it will show 14 pixels perfectly in LGR, HGR, and DHGR because 
it is in 560x192 resolution.  When you go in Super Resolution as 640x200, it 
needs to lock every 16 cycles so it will show 16 pixels perfectly in Super 
Resolution.  It is why you see black vertical line each 16th cycle.
    I hope that you will find the solution to fix Super Resolution problem 
near the future.  Please provide me JPG that you demo in DHGR like Sierra 
game such as King's Quest as soon as possible.

Bryan Parkoff