how to change resolution depth from 8 to 24 without using m64config

[daydok]

i have a sunblade100 that connects to an older 20" sun monitor. i use a converter to plug the monitor into the 15pin vga port. when i try to run

"m64config -depth 24 -res 1152x900x66 try",

which the monitor can easily take (according to the specs), it comes out fuzzy. all i really want to do is to change my depth from 8 to 24. is there a file i can modify? some printouts:

m64config -propt

--- OpenWindows Configuration for /dev/fbs/m640 ---
OWconfig: machine
Video Mode: not set
Depth: not set

m64config -prconf

--- Hardware Configuration for /dev/fbs/m640 ---
ASIC: version 0x27004752
DAC: version 0x0
PROM: version 106
Possible depths: 8, 24
Current resolution setting: 1152x900x66
Current depth: 8


thanks for all your help!