Display scrambling problem

Guy Laden (laden@math.tau.ac.il)
Sun, 2 Jun 1996 04:06:03 +0300 (GMT+0300)

The following is a description of a problem I'm having with V1.2.
I'm posting this to the mailing-list as well as bugs@oberon.ch.
Personally I'd be interested in knowing about any bugs (and workarounds)
people come across, and am hoping others will post here as well.
If there are more than a couple reports, I'll list them on a web-page.

Perhaps people can post feedback - whenever anyone reports a problem on a
specific architecture/OS it would be useful to know whether it occurs
under other OS's or configurations as well.

Apart from the problem I describe below, I am unable to install the v1.2
educational version under Windows 95 - the setup program aborts.
If anybody has successfully installed it under Win95, could you please let
me know so that I am sure the problem is with my system and not with Oberon/F.

Regards,
Guy.

--

I've encountered a screen-update problem which causes TextView windows to get completely scrambled after scrolling them. To reproduce it consistently I perform the following:

a. Open TextView window in browse mode (say the 'Users Guide') b. Position the new window so its bottom edge is 'below' the bottom of the 'main' Oberon/F window. Something like:

--------------------------------- | | <-- the main Oberon/F application window | | | |---------------| | | | | <-- A TextView window | | | | | | | | | | | | --------------------------------- | | | | <-- This part of the window isnt visible -----------------

c. Repetitively scroll downwards using the 'down' arrow key. When I scroll downwards _slowly_, the bug doesnt appear, but if I press and hold down the key so that it auto-repeats the bug consistently appears with all TextView windows that I've tried. The speed of the scrolling is important, so if you cant reproduce the problem, perhaps try to increase the 'repeat rate' in the Keyboard section of the Windows Control-Panel.

This is with Oberon/F V1.2 (educational version) on a PC running Windows 3.11. I have an ATI mach32 display adaptor - the bug may be with the driver, though I dont think so because I havent had any similar problems in the last year or so of using the adaptor.