TANDY 1000 RLX  (250-1452/53)          Settings         Faxback Doc. # 1322

Refer to Faxback Doc. # 1292 for Main Logic & SSJ Board Layout:

* = Factory Default

E10-E11    * Dual map video BIOS at F0000-F7FFF and C0000-C7FFF
E11-E12      Dual mapping of video BIOS disabled

E7-E8        Disable onboard VGA port
E8-E9      * Enable onboard VGA port

E2-E3        Video IRQ3 enabled (Jumpered)
           * Video IRQ3 disabled (Not Jumpered)

E4-E5      * FDC primary address
E5-E6        FDC secondary address

Changing the Microphone/Line Audio Jumper:

Note: These Jumpers are located on the SSJ Board.

Microphone                E8  ÚÄÄo   Microphone Input
Jumper:                   E7  ÀÄÄo
                          E6     o   Line Audio Input

Line/Audio                E8     o   Microphone Input
Jumper:                   E7  ÚÄÄo
                          E6  ÀÄÄo  *Line Audio Input

Most of the items on the system board that need your attention are connectors 
to which you can connect internal options. One item connected to your system 
board is the satellite board which does have a slightly different job: the 
microphone/line audio jumper lets you select the option you want to plug into 
the microphone connector.

Your system can tell what kind of sound (audio) equipment you're going to plug 
into your microphone connector by checking to see which two of the three pins 
have the jumper placed over them.

The default setting for the jumper lets you plug a microphone into the 
microphone connector.

You can plug keyboards, guitars, and other audio equipment into the microphone
connector. If you want to plug audio equipment with line-level output into the
connector, you must change the jumper setting.