
STB SYSTEMS, INC.

POWERGRAPH VGA (VER. 2)

Card Type                 Video
Video Chip Set            Unidentified
Highest Resolution        1024 x 768
Supported
Maximum Onboard Memory    1MB DRAM
Data Bus                  16-bit ISA
Video Types Supported     XVGA

[Image]

                                CONNECTIONS

          Function             Label           Function             Label

  15-pin analog video port      J5     DAC chip socket               U2

  DAC chip                      U1

            Note: Either U1 or U2 should be installed, but not both.

                        USER CONFIGURABLE SETTINGS

                   Setting                       Label        Position

     Two wait state operation                    J1         Pins 2 & 3
                                                               closed

      Zero wait state operation                   J1         Pins 1 & 2
                                                               closed

     Card does not use IRQ2/9                    J2         Pins 2 & 3
                                                               closed

      Card uses IR/FONT                           J2         Pins 1 & 2
                                                               closed

     Factory configured - do not alter           J3         Pins 1 & 2
                                                               closed

     BIOS uses 8-bit I/O                         J5         Pins 1 & 2
                                                               closed

      BIOS uses 16-bit I/O                        J5         Pins 2 & 3
                                                               closed

                                   DRAM

            Note: This card may take 256KB, 512KB, or 1MB of on-board
            DRAM. The locations of the banks and the configurations of
            the chips in these banks is unidentified.

                      VERTICAL SCAN RATE

     Resolution           Scan Rate               J4

      640 x 480              60Hz          Pins 1 & 2 closed

      800 x 600              56Hz          Pins 1 & 2 closed

     1024 x 768        43Hz (interlaced)   Pins 1 & 2 closed

      640 x 480              72Hz          Pins 2 & 3 closed

      800 x 600              72Hz          Pins 2 & 3 closed

     1024 x 768              60Hz          Pins 2 & 3 closed

