433 SX (259-5147)               Settings                Faxback Doc. # 1989

A jumper is a small, plastic cover that contains metal contacts. Jumpers
are placed on small metal pins that protrude from a circuit board. Jumpers
and pins are grouped and labeled as jumper blocks.

The jumpers on the main logic board are set at the factory for your
computer model. However, if you install certain hardware options or choose
to enable or disable certain system features, you might need to change some
jumper settings.

CAUTION: Incorrect jumper settings can cause a malfunction or a decrease in
         performance.

The following example show the settings for jumpers on the main logic board.
For example, "1-2" indicates that the jumper should be installed on Pins 1
and 2.

Example:
                (123)    <- Numbers in parentheses indicate order of pins
                 ooo J9  <- Jumper Name - this is marked on main logic board
Would look like:
                +---+<----- Jumper Block
                |o o|o J9
                +---+


+---------------------------------+
|Installing an Upgrade Processor: |
+---------------------------------+

Note: The DX and DX2 style processors are functionally the same, as an
      Overdrive processor. An overdrive processor will be marked "Overdrive"
      a DX or DX2 style will be marked 486DX or 486DX2.

Your computer has an i486 SX microprocessor; you can install a 487 SX, 486
DX, 486 DX2, or an OverDrive Processor (either 50MHZ or 66MHZ). The 487 SX
will provide math coprocessor functions only. The DX, DX2, and Overdrive
processors will increase the internal clock speed of the CPU in addition to
providing the math coprocessor functions. The performance upgrade socket
(U62) on the main logic board allows easy installation of an upgrade
Processor.

CAUTION: Double check the jumper settings before installing the new chip.
         Incorrect installation of an upgrade processor can cause electrical
         damage to the main logic board or the component. If you choose not
         to perform this procedure, your computer dealer can do this for
         you.

433 SX CPU with:
+---------------------------------------------------+
|487SX       |33Mhz DX    |50Mhz DX2   |66Mhz DX2   |
|Math        |Processor   |Processor   |Processor   |
|Coprocessor |            |            |            |
|------------+------------+------------+------------|
|J19 1-3, 2-4|J19 3-5, 4-6|J19 3-5, 4-6|J19 3-5, 4-6|
|J26 1-2     |J26 1-2     |J26 1-2     |J26 1-2     |
|J27 2-3     |J27 1-2     |J27 2-3     |J27 1-2     |
+---------------------------------------------------+
+-------------------------+ ** The overdrive chip is currently the more
|50Mhz  **   |66Mhz  **   |    accepted method of upgrading to 50 Mhz or
|Overdrive   |Overdrive   |    66 Mhz speeds. The overdrive chip can be
|Processor   |Processor   |    ordered from Third Party Products
|------------+------------|
|J19 1-3, 2-4|J19 1-3, 2-4|
|J26 1-2     |J26 1-2     |
|J27 2-3     |J27 1-2     |
+-------------------------+

Secondary Cache Memory (J16):
+----------------------------------------------------+
|CACHE SIZE  | J16 JUMPER SETTINGS                   |
|------------+---------------------------------------|
|None        | 1-2,3-4,5-6,9-10 (factory settings)   |
|64KB        | No jumpers installed (remove factory jumpers)
|128KB       | 1-2,5-6,7-8                           |
|256KB       | 1-2,3-4,5-6,9-10                      |
+----------------------------------------------------+
See Faxback Document # 2194 for installation instructions for Cache memory.

Microprocessor Type (J19):
+----------------------------------------------------+
|Microprocessor   |   J19 JUMPER SETTINGS            |
|-----------------+----------------------------------|
|486SX, 487SX or  |   1-3, 2-4  (factory setting)    |
|Overdrive for SX |     NOTE: OPD Chip               |
|-----------------+----------------------------------|
|486DX, 486DX2 or |   3-5, 4-6   NOTE: OPDR Chip     |
+----------------------------------------------------+

CMOS RAM and Power On Password Clear (J20):
+----------------------------------------------------+
|CMOS RAM STATUS | J20 JUMPER SETTING                |
|----------------+-----------------------------------|
|Not cleared     | Jumper installed (factory setting)|
|Cleared         | Jumper not installed              |
+----------------------------------------------------+
See Faxback Document # 1968 for specific instructions on clearing the CMOS
ram.

Microprocessor Speed (J26 & J27):
+----------------------------------------------------+
|Microprocessor Speed | J26   J27 Jumper Settings    |
|---------------------+------------------------------|
|25 or 50 Mhz         | 1-2   2-3                    |
|---------------------+------------------------------|
|33 or 66 Mhz         | 1-2   1-2  (factory setting) |
+----------------------------------------------------+

On-Board Video (J28):
+----------------------------------------------------+
|ON-BOARD VIDEO        | J28 JUMPER SETTING          |
|----------------------+-----------------------------|
|Enable                | 2-3 (factory setting)       |
|Disable               | 1-2                         |
+----------------------------------------------------+
Note: Disable only if another video card is used in the CPU.

Diskette Drive Write Protection  (J30):
+----------------------------------------------------+
|DISKETTE DRIVE        | J30 JUMPER SETTING          |
|WRITE PROTECTION      |                             |
|----------------------+-----------------------------|
|Enable                | 1-2                         |
|Disable               | 2-3 (factory setting)       |
+----------------------------------------------------+
Note: Enable will make all floppy disk read only.

On-Board Video Zero Wait State (J32):
+----------------------------------------------------+
|ZERO WAIT STATE | J32 JUMPER SETTING                |
|----------------+-----------------------------------|
|Enabled         | Jumper installed (factory setting)|
|Disabled        | Jumper not installed              |
+----------------------------------------------------+
Note: Change this setting only to resolve a conflict with an ISA expansion
      adapter that also uses zero wait state operation.

+------------------------+
|Reserved Jumper Blocks: |
+------------------------+

The following jumper blocks are reserved for factory use. Use only the
factory settings.
+---------------------------------------------------+
|Jumper Block      | Factory Setting:               |
|------------------+--------------------------------|
|J9                | 1-2                            |
|J11               | Jumper not installed           |
|J13               | 1-2                            |
|J14               | 2-3                            |
|J29               | Jumper not installed           |
|J31               | 2-3                            |
+---------------------------------------------------+

(rjs-06/02/93)
(smm 08/24/93)

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