Path: utzoo!attcan!uunet!lll-winken!ames!mailrus!purdue!decwrl!ucbvax!WPI.BITNET!GREYELF
From: GREYELF@WPI.BITNET
Newsgroups: comp.sys.apple
Subject: graphics
Message-ID: <8903220542.AA24198@wpi>
Date: 22 Mar 89 05:42:02 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 25

I've heard a great deal of talk here lately about games that use page
flipping techniques.  It IS possible (even easy) to tap the
VBL interrupt itself, and use an interrupt driven routine to
flip the pages, then return, and let the program draw on the other
page.  As for page  flipping in Double hires mode, won't work.
Unfortunately the use of double-hires graphics causes the computer to
ignore the status of the DP2 line,  the line that control which page
is being displayed.

I've been talking about putting a multitasking feature in the next
version of SHELL, for anyone interested, read the docs.  Certainly
if people just want the ability to switch from one currently
running program to another on the fly like a mac, that should
not be a problem, I'll just make a reset interceptor.

One question guys, has anyone tried shell?  I'm really getting
discouraged here.  I'll make a deal, if I get enough money
to buy a IIgs, I'll make a IIgs version.  :^)

--
Michael J Pender Jr  Box 1942 c/o W.P.I.        I wrote SHELL, send bug
greyelf@wpi.bitnet   100 Institute Rd.          reports, suggestions, cash,
greyelf@wpi.wpi.com  Worcester, Ma 01609        to me.

P.S.  I help people too.