Apple PC Compatibility Card 12-inch card - Manual (Page 200)

Video mode tables
This section describes the video mode specifications for ATI video drivers
using DRAM.
When discussing color depth, 8 bits per pixel (8 bpp) is the same as 256
colors. Therefore, the relation between bpp and colors is as follows:
Bits per pixel Number of colors
8 256
16 65,000
24 16,700,000
The ATI video drivers also support 15 bpp (32,000 colors). Any resolution and
refresh settings that support 16 bpp will support 15 bpp.
DRAM accelerator mode (WINBOOST)
The following table lists color depths and other features supported at various
monitor resolutions in graphics mode. The settings listed in this table can be
applied to multiple-scan monitors only.
Refresh Horizontal Pixel clock Maximum color
Resolution rate (Hz) frequency (kHz) (MHz) depth (bpp)*
640 x 480 60 31.4 25.2 24, 32 †
72 37.7 31.2 24, 32
75 37.5 31.5 24, 32
90 47.9 39.9 16, 24
100 52.9 44.9 16, 16
continued .
186 Appendix C