Universal Desktop Box Jumper Settings

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JUMPER SETTINGS

The Universal Desktop Box has a number of motherboard jumper settings which may be used to configure the system operation. There are two motherboard designs, the VX40 type onto which the 166MHz CPU is directly soldered, and the common VX41 VX42 type with a socketed CPU and cache SIMM. You should ensure that you have correctly identified which model you have before attempting to change any jumper settings.

SYSTEM BOARD

Jumpers for VX40, VX41, VX42 main logic boards

      VX41
VX40  VX42  Function

W9     W12    Mini console (auxiliary)
W8     W10    Normal power-up sequence (default)
W7     W11    Causes the system to attempt a floppy
              boot fail safe load (FSL)
W6-W3  W6-W3  SRM graphics display resolution
W2     W2     Resets or halts system when connected
              to a switch (see J8)
J8     J8     2-3 causes reset (default)
              1-2 causes halt request CPU interrupt
--     W9-W7  CPU speed select  VX41 and VX42 only

GRAPHICS DISPLAY RESOLUTION

Jumpers W6 to W3 for all models. 0 indicates that the jumper is installed, 1 indicates no jumper present.

W W W W                                Vertical Pixel
6 5 4 3  Video Standard    Resolution  Refresh  Freq (MHz)

0 0 0 0  VGA               640x480     59.940    21.175
0 0 0 1  ERGO VGA          640x480     72.790    31.500
0 0 1 0  SVGA              800x600     60.320    40.000
0 0 1 1  ERGO SVGA         800x600     72.190    50.000
0 1 0 0  VESA 1024x768     1024x768    70.070    75.000
0 1 0 1  Digital 1024x768  1024x768    72.033    74.367
0 1 1 0  Digital 1024x864  1024x864    60.000    70.000
0 1 1 1  1280x1024 60Hz    1280x1024   60.100   110.150
         S3 86C928
1 0 0 0  1280x1024 66Hz    1280x1024   66.510   119.843
1 0 0 1  1280x1024 72Hz    1280x1024   72.556   130.808
1 0 1 0  1280x1024 72Hz    1280x1024   72.050   130.080
         S3 86C928
1 0 1 1  1280x512 Stereo   1280x512   139.336   130.804

Click here for VX40 video jumper illustration (37K)

CPU CLOCK SPEED

Jumpers for VX41 and VX42 models. Note that these settings are provided for owners wishing to upgrade their 166MHz models to a 233MHz model in conjunction with the appropriate CPU swap. Some owners report that the 233MHz CPU may be overclocked quite sucessfully to 266MHz. However, any owner attempting to do so should carefully consider the additional heat generated and associated cooling issues along with any warranty issues involved with such modifications. 0 indicates jumper installed, 1 indicates no jumper present. * indicates that this setting is not supported by Digital.

W W W
9 8 7  CPU speed

0 1 1  100MHz
1 1 1  133MHz
0 0 1  166MHz
1 1 0  200MHz
0 1 0  233MHz
1 0 0  266MHz*
0 0 0  300MHz*

Last updated 15 Jan 1997