[comp.sys.apple] Scan line interrupt & double hires for ][+

KAPFFER@DMZRZU71.BITNET (Matthias Kapffer) (03/26/88)

I just uploaded three short programs to APPLE2-L which complement the series
of Apple ][+ demos from Mark Kriegsman.
  The  first  two  were  written  be me.  They show something like a scan line
interrupt: While the first one draws just a static image (mixing text & lores)
as  an  intro  to  the  technique  the second combines the mode switching with
flicker free full screen animation.
  The  last program utilizes a similar technique as the 80 col demo to display
two  hires screens side by side, i.e.  with 560 pixels per line.  Using 70 col
software 140 chars/line become possible...
  Anyone interested in this stuff and being unreachable by the LISTSERV should
feel  free  to  ask  me for a direct mailed copy (but supply me with a useable
return path !).

                                        Matthias Kapffer
                                        <KAPFFER@DMZRZU71.BITNET>