Graphics Master Board  (250-3044)        Settings       Faxback Doc. # 2076

Note: Refer to Faxback Doc. # 2079 for board layout.

TECHMAR GRAPHICS MASTER BOARD  (*13 Inch Board)

Graphics Master is shipped already set for a standard monitor. The jumpers
are discussed in numerical order as they are labeled on the board and in the
diagram.

The following are the Default Settings as they come from the factory:

JPR1 Positions A, B, and C are jumpered.

JPR3 For factory testing only. Do not modify.

JPR4 Jumpered

JPR5 Middle two pins jumpered and one extra connector on the top pin.

JPR6 Jumpered. (Hardware color burst disable for standard monitor.)

JPR7 Not jumpered.

JPR8 Not jumpered.

JPR10 For factory test only. Do not modify.

JPR11 For factory test only. Do not modify.

Jumper blocks JPR4, JPR5, JPR6, JPR8, and positions C, D, E, and F of JPR1 are
not modified for setups described in this manual. They should not be changed.

OTHER COMPONENTS

P1- The DB9 Connector for the IBM Monochrome Display and look-alikes and the   
    IBM RGB Monitor.

P2- RF Modulator Connector. RF Modulators that are IBM compatible will work.
    The second pin from the top has been removed.

P3- Light Pen Connector. Light pens that are IBM compatible will work. The
    second pin from the top has been removed.

P4- This is the external sync connector and is only in special applications.

P5- Not used.

P6- Not used.

Box- Composite signal intensity regulator. The screw on the left hand side can
     be turned left or right to adjust the intensity of the composite signal
     output at the RCA jack and the RF modulator.

SW1- Monitor Select Switch. Software reads the switch and informs DOS of the
     monitor type and sets the correct text or graphics resolutions. The
     switch does not physically change the circuitry of the board.

RCA JACK CONNECTOR- For standard (composite) monitors.

Before you set up your Graphics Master, you must determine what kind of
monitor you have. Your monitor will fall into one of two board categories:
Standard or IBM Monochrome Display. Examine the end of the cable that plugs
into your Graphics Master to determine your monitor type.

RCA jack--Always a standard (composite) monitor.

DB9 connector--If it is an RGB (color) monitor, then it is a standard monitor.

If it is a monochrome (green or amber) monitor, then it is an IBM Monochrome
Display or look-alike.

Optionally, the second monitor may be an IBM Monochrome Display that will not
be the reset monitor.

Then SW1 should be down, JPR7 should not be jumpered, JPR1 positions A, B, and
C should be jumpered, Positions D, E, and F should not be jumpered.

If you have an IBM Monochrome Display that will be attached to a Graphics
Master that will be the reset monitor.

Optionally, a second standard monitor that will not be the reset monitor.

Then SW1 should be up, JPR7 should be jumpered, JPR1 positions A, B, and C
should be jumpered, Positions D, E, and F should not be jumpered.

If you have a standard monitor that will be attached to an IBM Color/Graphics
Adaptor and IBM Monochrome Display that will be attached to a Graphics
Master.

Then SW1 should be up, JPR7 should be jumpered, JPR1 positions B and C should
be jumpered, Positions A, D, E, and F should not be jumpered.

If you have an IBM Monochrome Display that will be attached to an IBM
Monochrome Adaptor and a standard monitor that will be attached to a Graphics
Master.

Then SW1 should be down, JPR7 should not be jumpered, JPR1 positions A and C
should be jumpered. Positions B, D, E, and F should not be jumpered.

If you have an IBM Monochrome Display that will be attached to an IBM
Monochrome Adaptor, a standard monitor that will be attached to an IBM
Color/Graphics Adaptor, any monitor attached to a Graphics Master.

Then SW1 should be up if Graphics Master is attached to the monochrome
monitor, or down if Graphics Master is attached to the standard monitor.

JPR7 should be jumpered.

JPR1 position C should be jumpered. Positions A, B, D, E, and F should not be
jumpered.

Note: The main logic board is the bottom board inside your computer. Switch 
module SW1 is located just beyond the back left corner of the drive tower.

Only switch positions 5 and 6 of SW1 are significant to Graphics Master. Do
not change any of the other switches.

For future reference, draw a diagram of the way that all the SW1 switches are
currently set.

Set switches 5 and 6 of the SW1 block to the following:

If you are going to use the IBM Monochrome Display at reset time, set SW1,
switch 5 and 6 to the OFF position.

If you are going to use a standard monitor at reset time, set SW1, set
switch 5 to the OFF position and 6 to the ON position.

Double check your settings. Make sure that you did not change any other
switches.

CAUTION: If you have an IBM Color/Graphics Adaptor and a Graphics Master and 
only one standard monitor, you will need to replace the IBM board with 
Graphics Master. The IBM PC gets confused if both boards are in the system at 
the same I/O address and screen buffer address.

   Video port address range 3B0-3BF Hex for Monochrome
   Video port address range 3D0-3DF Hex for Color

If you are using more than one monitor use the following settings:

Color Primary w/ mono secondary jumper the following:

JPR1A, JPR1B, JPR1C, JPR4, JPR5 (middle) JPR6, SW1 down

Monochrome Primary with color secondary jumper the following:

JPR1A, JPR1B, JPR1C, JPR4, JPR5 (middle) JPR6, JPR7, SW1 up

Color on Graphics Master & Monochrome on Monochrome board jumper the 
following:

JPR1A, JPR1C, JPR4, JPR5(middle), JPR6, SW1 down   (+) {Best configuration}

Note: Remember to set the computer for Monochrome or Color display.