Re: Half-Res Graphics?

[rbowman@ypsitoys.com (Dr. Van Thorp)]

So this mode gave you 80 x 50 resolution with 16 colors. I'm guessing
that all those games were nothing more than rumors.


see_sig_for_valid_email@no.spam (Simon Williams) wrote in message news:<1g9u4rk.149ngjj1fxkdz4N%see_sig_for_valid_email@no.spam>...
> To quote someone who knows:
> 
> > Double Lo-Res is not documented anywhere as an official graphics mode.
> > Despite this, Applesoft Basic has support for it!  I'm not sure about
> > the original IIe, but it definitely works on the enhanced IIe, IIc and IIgs.
> > 
> > To enable Double Lo-Res mode:
> > 
> > 1. Get into 80-column mode using PR#3.
> > 2. Turn on Annunciator 3 by doing a POKE 49246,0.
> > 3. Use Lo-Res graphics commands as normal, starting with GR.
> > 
> > To restore normal Lo-Res graphics, POKE 49247,0 then do a GR again.
> > 
> > [I'm not sure about the ordering of these pokes - they might be around
> > the other way.  The manual isn't nearby.]
> > 
> > Note that you have to be in 80-column mode to use Double Lo-Res (or
> > Double Hi-Res).
> > 
> > 
> > Double Hi-Res is enabled in the same manner - 80 column mode, poke the
> > annunciator, and enable Hi-Res graphics using HGR or whatever.  The
> > big catch: Applesoft has no support for Double Hi-Res mode, so
> > you'll get alternating vertical stripes of random data and black
> > stripes, and drawing will only affect the 'black' areas.
> > 
> > Double Lo-Res requires an 80-column card; Double Hi-Res requires an
> > extended 80-column card (i.e. 128k RAM). -- 
> > David Empson