Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu
From: daveh@ccwf.cc.utexas.edu (David H. Huang)
Newsgroups: comp.sys.apple2
Subject: Re: Bug contest
Message-ID: <43748@ut-emx.uucp>
Date: 5 Feb 91 16:17:41 GMT
References: <9102050238.AA18080@anaconda.cis.ohio-state.edu> <1991Feb5.044339.25263@nntp-server.caltech.edu>
Sender: news@ut-emx.uucp
Reply-To: daveh@ccwf.cc.utexas.edu (David H. Huang)
Organization: The University of Texas at Austin
Lines: 32

In article <1991Feb5.044339.25263@nntp-server.caltech.edu> toddpw@nntp-server.caltech.edu (Todd P. Whitesel) writes:
>meekins@CIS.OHIO-STATE.EDU (timothy lee meekins) writes:
>
>>Anyways, about a half hour ago, I was working on Z3D. To make things short,
>>the entire screen began scroll, almost like a screwed-up vertical hold on a
>>TV. very strange. I think the electron beam location is getting screwed
>>big time. If anyone has the foggiest notion of how this could happen, let
>>me know, it would be neat to take advantage of. The entire screen was
>>scrolling, border and all.
>
>This is what happens if you set PAL video mode (50 hz vertical sync).
>When you do a control-option-reset, one of the options is to set system
>standards and 50 Hz -- this is for european/australian PAL video equipment.
>In the hardware it is activated by bit 4 (mask $10) of $c02b, which is
>described in the firmware reference (page 281 of the hardcover).

That doesn't happen with my monitor... the sound it makes changes and the
picture expands and then kindof bounces off the top of the screen (The top
line of text gets turned upside down). This is easily remedied by adjusting the
vertical size control at the back of the monitor, but the picture is too small
when you go back to 60Hz. Also, I've heard that it makes the clock (time clock,
not CPU clock) run slow.

>Todd Whitesel
>toddpw @ tybalt.caltech.edu


-- 
David Huang                                 |
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