T8900DIP.TXT - Jeffrey E. Hundstad (j3gum@vax1.mankato.msus.edu)

                     Switch Settings on the Trident 8900C

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               |-----------| |-------------------| |-----------
                   VGA Graphics Adapter Layout #1 (8-DRAM)

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               |-----------| |-------------------| |-----------
                VGA Graphics Adapter Layout #2 (2/4/8 - DRAM)

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                VGA GRaphics Adapter Layout #3 (2/4/8 - DRAM)

1.  Dip Switches
2.  DB-15 connector: For analog monitors.
3.  DB-9 connector: for TTL monitors. (* NOTE #1)
4.  Jumers J1, J2, J3, J4 (J3 for layouts #2 and #3, J4 for layout #3)
5.  Video BIOS: Basic Input/Ouput System.
6.  TVGA 8900 Chip: VGA GRaphics chip.
7.  Edge connector: For IBM PC/XT, PC/AT and compatible systems.
8.  Video DRAM: up to 1MB
9.  Feature connector: For special applications.
10. Video DAC
11. Jumper Blocks JP1 and JP2 (2/4/8 board only)
* NOTE #1 - Hardware option.  Feature not present for all board versions.

Switch settings for the 6 switch dip box (#1 from figures).

Switch 3:  Scan Rate
  On  - Less than 48KHz (default)
  Off - 38-49Khz

Switch 5:  Fast and Slow Address Decode
  Off - Fast address decode (default)
  On  - Slow address decode

Switch 6:  8/16 bit Data Path
  Off - 16-bit data path (default)
  On  - 8-bit data path


Jumper settings

J1:  Settings for IRQ9
 1 2 3     1 2 3
   xxx     xxx
 Off (def)   On

J2:  Settings for Bus Size Detections
1           1 x
2 x         2 x
3 x         3
Autodetect  Standard Interface
(def)

J3:  Settings for DRAM Configuration
   1  2  3       1  2  3       1  2  3
   ----          |  |             ----
   ----          |  |             ----
   4  5  6       4  5  6       4  5  6

    Two DRAM      Four DRAM      Eight DRAM

J4:  DRAM Clock Select
 1 2 3     1 2 3
   xxx     xxx
 40 MHz    48 MHz
Two DRAM   4/8 DRAM


SW1 & SW2