1200HD/A  (250-3000/A)             Settings            Faxback Doc. # 1962

HD Version:

Switch S-1:

     #1     OFF   Allows booting from floppy drive "A" (always OFF)

     #2     OFF   Indicates coprocessor is installed
            ON    Indicates coprocessor is NOT installed  (standard)

     #3-4   Both in OFF position for 256K of RAM on the Main Processor
            board.

     #5     Determine the type of monitor,  ON for color or OFF for mono.

     #6     Determines the number of columns on the monitor, ON for 40 or
            OFF for 80.

     #7     In ON position denotes one floppy drive and one hard disk
            drive.  Use OFF if you want to use a RAM disk.

     #8     Must be set in the ON position at all times

Switch S-2

Amount of RAM in
Expansion Slots      1      2      3      4      5     6-8

     None           OFF    OFF    OFF    OFF    OFF    NOT
      64K           OFF    ON     ON     ON     ON     
     128K           ON     OFF    ON     ON     ON     USED
     192K           OFF    OFF    ON     ON     ON
     256K           ON     ON     OFF    ON     ON
     320K           OFF    ON     OFF    ON     ON
     384K           ON     OFF    OFF    ON     ON

A Version:

Switch S-1:

     #1     OFF   Allows booting from floppy drive "A" (always OFF)

     #2     OFF   Indicates coprocessor is installed
            ON    Indicates coprocessor is NOT installed  (standard)

     #3      #4    Memory

     OFF     OFF   256K 
     OFF     ON    384K
     OFF     OFF   640K

     #5      #6    Monitor

     OFF     OFF   Monochrome monitor or more than one monitor
     OFF     ON    Color monitor 40 X 25 mode
     ON      OFF   Color monitor 80 X 25 mode
     ON      ON    EGA monitor

     #7     ON    Indicates one floppy and one hard drive
            OFF   Indicates two floppy drives

     #8     ON    Must be set to ON at all times

Jumper Settings:

Main Logic Board     Memory Kit    Jumper     Switch SW-1     Memory Level

(default)                         JP-1 F-C    3 ON  & 4 OFF       256K
                       25-3062    JP-1 C-B    3 OFF & 4 ON        384K
                    (2)25-3062    JP-1 C-B    3 OFF & 4 OFF       640K
Jumper JP-1:

F=Front
C=Center
B=Back