Newsgroups: comp.sys.apple2.programmer Path: blue.weeg.uiowa.edu!news.uiowa.edu!hobbes.physics.uiowa.edu!math.ohio-state.edu!howland.reston.ans.net!swrinde!elroy.jpl.nasa.gov!decwrl!waikato!comp.vuw.ac.nz!actrix.gen.nz!dempson From: dempson@atlantis.actrix.gen.nz (David Empson) Subject: Re: Double-High Res Page 2? Message-ID: Sender: news@actrix.gen.nz (News Administrator) Organization: Actrix - New Zealand Internet Service Providers Date: Thu, 16 Feb 1995 21:57:29 GMT References: <3hjkdb$20q@clyde.ics.uci.edu> <3husvv$7t1@mirv.unsw.edu.au> <3hvutp$bkj@fishlab3.fsh.mtu.edu> X-Nntp-Posting-Host: atlantis.actrix.gen.nz Lines: 31 In article <3hvutp$bkj@fishlab3.fsh.mtu.edu>, Joshua P. Onge wrote: > David Empson (dempson@atlantis.actrix.gen.nz) wrote: > > : double lo-res graphics (page 1) $0400-$07FF $0400-$07FF > > Did you say "double lo-res graphics"? I've never heard of this. Not surprising - Apple have never officially documented it. It is not mentioned in any of the technical/hardware reference manuals. Even more surprising: the IIc and IIgs have firmware and Applesoft support for it! On the IIc and IIgs, you can access double lo-res mode from Applesoft as follows: 10 D$=CHR$(4) 20 PRINT D$;"PR#3": REM 80-column mode 30 POKE 49246,0: REM $C05E - enable double resolution graphics 40 GR: REM Turn on double lo-res mode You can then use the standard lo-res commands (PLOT, VLIN, HLIN, COLOR=) to draw, with an available drawing area of 80 columns and 40 or 48 rows. The colours are identical to standard lo-res. I think the SCRN function doesn't work properly in double lo-res. -- David Empson dempson@actrix.gen.nz Snail mail: P.O. Box 27-103, Wellington, New Zealand