Path: utzoo!attcan!uunet!wuarchive!usc!ucsd!ucbvax!gnh-applesauce.cts.com!flee
From: flee@gnh-applesauce.cts.com (FRANK LEE)
Newsgroups: comp.sys.apple2
Subject: Re: Blankinit v0.2 (was in bit.listserv.apple2-l)
Message-ID: <0093E1C16993D460.00000111@dcs.simpact.com>
Date: 13 Oct 90 16:29:46 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 16
X-Unparsable-Date: Fri Oct 12 90 at 21:40:42 (EDT)

I've written a screen blanker for DOS 3.3. It occupies page 3, but I've
re-assembled it once to allow it to hide itself right under $9D00. The
limitations of my pgm are as follows:
o Will work only when the computer is expecting user input.
o Best environment would be when programming in BASIC or when in the Monitor.
This is mainly due to the fact that Apples don't have features like a
clock-tick interrupt, like they do on IBMs. Also, the machine must be in text
mode when it runs. If you have an Apple IIe or II+, a hardware solution may be
better. Connect some type of relay to the annunciator outputs to turn the video
signal on and off. Some custom circuitry will be needed.
My routine doesn't really blank the screen, but it provides an animated display
of a block cursor bouncing around a blank screen.

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