Article View: rec.games.programmer
Article #1861Re: Colour cycling - I get flicker
From: John A. Slagel
Date: Mon, 25 Jan 1993 15:52
Date: Mon, 25 Jan 1993 15:52
20 lines
1558 bytes
1558 bytes
bromage@mullauna.cs.mu.OZ.AU (Andrew Bromage) writes: >I've got some code for cycling the VGA palette, but I have problems with >flicker. The main problem is that I can't disable interrupts during the >"rep outsb" (did I mention I was using the 286 instructions?) because I've >got music playing in the background. The result is that I get terrible flicker >over the top quarter or so of the screen. >Does anyone know a cure for this? The problem is that you can only write to the palette registers during verticle retrace, or else snow results... so, you might need to wait for retrace, send 1/2 of them, wait again, and send the other half if you can't send them all in one retrace period. -- ----------------------------------------------------------------------------- John A. Slagel "My old man used to tell me, before he left this j-slagel1@uiuc.edu shitty world, never chase buses or women- you (217) 337-7930 always get left behind." -The Marlboro Man
Technical Details
Message-ID:
<C1F2r5.4on@news.cso.uiuc.edu>Path:
arc1-ca.pugleaf.net!sparky!uunet!usc!howland.reston.ans.net!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!uxa.cso.uiuc.edu!jas37876References:
<9302511.29461@mulga.cs.mu.OZ.AU>Show Full Headers
Complete Article Headers
Newsgroups: rec.games.programmer Path: arc1-ca.pugleaf.net!sparky!uunet!usc!howland.reston.ans.net!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!ux1.cso.uiuc.edu!news.cso.uiuc.edu!uxa.cso.uiuc.edu!jas37876 From: jas37876@uxa.cso.uiuc.edu (John A. Slagel) Subject: Re: Colour cycling - I get flicker References: <9302511.29461@mulga.cs.mu.OZ.AU> Message-ID: <C1F2r5.4on@news.cso.uiuc.edu> Sender: usenet@news.cso.uiuc.edu (Net Noise owner) Organization: University of Illinois at Urbana Date: Mon, 25 Jan 1993 15:52:15 GMT Lines: 20