Multisync/flickerFixer??
09-Oct-89 08:09:24
Sb: #68895-Multisync/flickerFixer??
Fm: Gregory B. Tibbs 73767,456
To: Ethan Solomita 70137,3271
Wrong-O Ethan,
Workbench is still 4 colors. The non-interlaced 640×480 will update 640 pixels
by 480 lines 60 times a second whereas the interlaced 640×400 only updates 30
times a second. That is where the 'flicker' comes from. So twice as much chip
ram bandwidth is used as normal.
So when the 640×480 non-interlaced 'productivity' mode is in effect, as much
chip ram bandwidth is used as 640x400x16 colors (more if you consider that
'productivity' mode has 80 more lines). There is an internal limitation that
cuts the palate down to 64 colors. The four colors possible is the maximum
number that would fit within the available bandwidth.
The net result is that a 640x400x4 Workbench (interlaced) would not slow down
the machine but the 640x480x4 'productivity' mode Workbench will drastically
slow down the machine. compensate (somewhat) for this. An application might
open a 640x480x2 color (monochrome) screen (say a DTP program) and your
statement would be correct.
-Greg