Apple PC Compatibility Card - Manual (Page 299)

Fixed-frequency monitors
The following tables list the resolutions supported on fixed-frequency (non-
multiscan) monitors. The color depths for 1 MB and 2 MB of DRAM are also
listed. You cannot change refresh rate and other timing items for fixed-
frequency monitors.
Macintosh 21-Inch Color Display
Refresh rate: 68.7 kHz (horizontal), 75.08 Hz (vertical)
Color depth
Resolution 1 MB 2 MB
640 x 400 16 bpp 16 bpp
640 x 480 16 bpp 16 bpp
800 x 600 8 bpp 8 bpp
1024 x 768 not supported 8 bpp
Macintosh 21-Inch Monochrome Display
Refresh rate: 68.7 kHz (horizontal), 75.08 Hz (vertical)
Color depth
Resolution 1 MB 2 MB
640 x 400 16 bpp 16 bpp
640 x 480 16 bpp 16 bpp
800 x 600 8 bpp 8 bpp
1024 x 768 not supported 8 bpp
299 Configuring Video Software