papa@pollux.usc.edu (Marco Papa) (01/17/89)
In article <302@lakesys.UUCP> mikes@lakesys.UUCP (Mike Shawaluk) writes: |I believe that the "flicker" problem that Blaine is talking about isn't |actually flicker per se, but the effect seen when certain color combinations |are scrolled in multi-color modes. For example, if you have yellow text on a |black background, and that line of text is scrolled upwards, you might see a |momentary ghost text line on the screen for a fraction of a second, |presumably since the text is being scrolled by the blitter, which can only do |one bit plane at a time (it can do 2 bit planes without noticable flashing, |but for 3 or more it poops out). Has anyone out there ever seen a terminal |program that didn't have this problem in an 8-color mode? That's not a "flicker" problem. Call it a "blitter feature" if you want. Any program (not just terminal programs, but editors and others as weell) that scrolls more than one bitplane will exhibit thei "feature" of blitter copying. I guess unless the blitter operation is changed, we can't do much about it. -- Marco Papa 'Doc' -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= uucp:...!pollux!papa BIX:papa ARPAnet:pollux!papa@oberon.usc.edu "There's Alpha, Beta, Gamma and Diga!" -- Leo Schwab [quoting Rick Unland] -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
brianr@tekig5.PEN.TEK.COM (Brian Rhodefer) (01/18/89)
<-- Marco Papa 'Doc'> Why isn't it possible to paint the new information into non-displayed lines of an oversize screen, taking however long, and then readjusting the pointers that the video generation system resets from at the Top Of Frame, such that a different section of the screen gets displayed? It seems to me that even all five bitplane pointers could be reloaded during vertical retrace, eliminating the `partially-moved bitplanes' effect. Am I missing something? Naively, Brian Rhodefer ...!tektronix!tekig5!brianr
limonce@pilot.njin.net (Tom Limoncelli) (01/20/89)
Marco, have you considered a double-buffered 9600 BPS emulator? :-)
(well, maybe I shouldn't have included the :-) )
--
Tom Limoncelli Drew University Madison NJ 201-408-5389
tlimonce@drunivac.Bitnet limonce@pilot.njin.net
"Fences make good neighbors" -Frost "I want an MMU" -Me
Standard disclaimer? No, we're still on the dpANS disclaimer.