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Re: Hardware projects - which would be most popular?
- Subject: Re: Hardware projects - which would be most popular?
- From: david@uow.edu.au (David Wilson)
- Date: 5 May 2002 16:10:04 +1000
- Newsgroups: comp.sys.apple2
- Organization: University of Wollongong
- References: <3cd37430$1@news.uow.edu.au> <3cd40747.6467985@news.videotron.ca>
- Xref: archiver1.google.com comp.sys.apple2:19294
markREMOVE@syndicomm.com (Mark Percival) writes:
>One thing I would like to see (not on your list) is a video adapter
>from the IIgs's RGB port to a standard VGA monitor. From what I
>understand the building of such would not be difficult nor expensive.
>The key component would be the doubling of one of the sync rates
>(vertical or horizontal, I forget which).
This would be rather tricky. Easier than composite video to VGA though.
RGB output from //gs is 14MHz dots on 15750Hz horizontal and 60Hz vertical.
VGA is 28MHz dots on 31kHz horizontal and 60Hz vertical refresh (or something
close). What the card would need to do is have a line buffer (probably two)
that clocks in a line of //gs video and then spits it out twice at double
the speed.
--
David Wilson School of IT & CS, Uni of Wollongong, Australia