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Re: RGB to VGA on a IIGS (again)
nyder wrote:
Intersil makes a bunch of different chips that are great for this.
I've been working on a converter for old computers (and other devices)
that takes the various res's and syncs it to a n RGB type monitor,
with an option to adjust the sync for multisync monitors.
Then intersil came out with a chip that will do the same thing, but
convert it to Componet form, which I realised is probably better for
todays TV's.
Although upsampling is necessary for VGA display, it may not be
necessary for a well-designed 480i display mode. Interfacing a IIgs
to a 480i component input would only require a few video op-amps
to matrix the RGB input into YCrCb.
Certainly, the simpler analog approach should be tried first.
I recently picked up an LCD screen for a Xbox 360 (I don't have one)
because it has componet vid in. Granted it's only a 9.2" monitor, but
it gives me a componet viewing source to experiment on.
I have a GS, but no monitor for it. I did pick up some older mac
monitors, but i'm not sure they will work. But very few of my old
computers actually have the monitors for them.
Unfortunately, no Mac monitors will work with the IIgs. The IIgs
monitor is an analog RGB monitor with NTSC(-like) scan rates.
anyways, i'm hoping to get back to my electronics work soon, so if you
let me know what the monitor is you want to hook your GS up to, i'll
see about making a device for you to test for me (and then keep a
working version for the testing, of course).
Plus any input onto what sort of monitors people are trying to connect
their older computers too would be nice. If everyone is going
componet then that makes things easier.
Unfortunately, the future of the component interface is also in doubt.
It is viewed as inconvenient by casual users and insecure by content
providers. However, it has a bit of "legacy" inertia, so it may remain
common on new monitors for a few years. Ultimately, it will be replaced
by HDMI or one of its derivatives for a hard-wired interface, and by
one of the contenders for the "standard" wireless HD interface.
On Jun 26, 12:46 am, "Michael J. Mahon" <mjma...@aol.com> wrote:
mdj wrote:
I think this problem will plague us indefinitely until either somebody
designs a custom solution, or physical display resolution becomes so
damn high than the effects disappear into the 'noise'
Right. "Smart" upsampling to 1080p should do pretty well. I haven't
tried that yet...
-michael
NadaNet file server for Apple II computers!
Home page: http://members.aol.com/MJMahon/
"The wastebasket is our most important design
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