It is possible to specify the screen resolution of PGX32 card via the output-device environment variable by using the format screen:rAxBxC, where:A is the desired horizontal resolution, B is the desired vertical resolution, and C is the desired refresh rate.
The system will check these values against an internal list of resolutions (see Table 6-3), and use the corresponding entry as the screen resolution.
For example, to use VESA1024 x 768 at 75 as the screen resolution, type the following at the ok prompt:
ok setenv output-device screen:r1024x768x75 ok reset
The new screen resolution will take effect following the reset, and will hold the resolution information until the output-device variable is changed manually.