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From: parkern@jacobs.CS.ORST.EDU (Neil Parker)
Newsgroups: comp.sys.apple2
Subject: Re: Increasing Graphics Resolution
Message-ID: <1991May22.095144.20649@lynx.CS.ORST.EDU>
Date: 22 May 91 09:51:44 GMT
Article-I.D.: lynx.1991May22.095144.20649
References: <91141.165437HDK@psuvm.psu.edu>
Sender: @lynx.CS.ORST.EDU
Reply-To: parkern@jacobs.CS.ORST.EDU (Neil Parker)
Organization: The Universal Society for the Prevention of Reality
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Nntp-Posting-Host: jacobs.cs.orst.edu

In article <91141.165437HDK@psuvm.psu.edu> HDK@psuvm.psu.edu (H. D. Knoble) writes:
>We are running an Apple IIe, 128K, 80-Column Card, enhanced, either DOS 3.3
>with AppleSoft or ProDos. We are looking for specific concrete answers
>with examples that run if this is practical.
>1) Is there any way (even with PEEK/POKE) to get more resolution from a
>   280 by 170 high resolution screen? Is there any mechanism to get more
>   colors?

Actually, the hi-res screen is 280x160 in mixed (graphics + 4 lines of
text) mode, and 280x192 in full screen mode.  You can go from mixed mode to
full-screen mode with POKE 49234,0.

There is also double-hires graphics, which is (in full-screen mode) 560x192
in black-and-white and 140x192 in color (16 colors--same as low-res).  You
can display it like this:

     PRINT  CHR$(4)"PR#3": POKE 49232,0: POKE 49239,0: POKE 49246,0

Unfortunately, that's about all you can do with it from BASIC--there are no
built-in double-hires commands.  If you can get back-issues of NIBBLE, you
might be able to find packages to add double-hires commands to BASIC (via
the "&" command).  I have a copy of such a package that I typed in from an
ancient issue of SOFTALK [does anybody else here remember SOFTALK?], but I
don't know if it's OK to distribute it.

(I suppose if you really wanted to, you could draw double-hires graphics
with POKE from BASIC, but this is an exercise which only the exceedingly
masochistic should attempt...)

>2) How can one copy a graphics screen to a printer capable of doing graphics?

That depends.  Some printer interfaces (the Grappler, for example) have
built-in graphics printing commands.  If you're not lucky enough to own one
of those, you'll need special software to do it.

               - Neil Parker
--
Neil Parker                 No cute ASCII art...no cute quote...no cute
parkern@jacobs.cs.orst.edu  disclaimer...no deposit, no return...
parker@corona.uoregon.edu   (This space intentionally left blank:           )