4020 SX  (250-4902/3)             Settings             Faxback Doc. # 1617

BIOS ROM jumpers E1-E2-E3 and E4-E5-E6

*  E1 and E2 - 32Kx8 ROMs
   E2 and E3 - Reserved
   E4 and E5 - Reserved
*  E5 and E6 - 32Kx8 ROMs

Video Mode Jumpers E7-E8-E9

*  E7 and E8 - Color
   E8 and E9 - Monochrome

Parallel Port Interrupt Jumpers E13-E14-E15

   E13 and E14 - IRQ5
*  E14 and E15 - IRQ7

Serial Port Interrupt Jumpers E16-E17-E18

*  E16 and E17 - IRQ4 (COM1)
   E17 and E18 - IRQ3 (COM2)

Multiple Frequency Monitor Jumpers E25-E26-E27

   E25 and E26 - Non-Standard Multiple-Frequency Monitor
*  E26 and E27 - VGA Analog or Standard Multiple-Frequency Monitor

Video Interrupt Jumpers (IRQ9) E22-E23-E24

*  E22 and E23 - Disabled
   E23 and E24 - Enabled

Video Enable Jumpers E19-E20-E21

*  E19 and E20 - Enabled
   E20 and E21 - Disabled

Serial Port ID Jumpers E28-E29-E30

   E28 and E29 - Serial Port Enabled as COM3 or COM4
*  E29 and E30 - Serial Port Enabled as COM1 or COM2

Power Switch LED Jumpers E10-E11-E12

   E10 and E11 - Ties Power Switch LED to IDE Port Drive Active Signal
*  E11 and E12 - Ties Power Switch LED to 5V (Turns On at Power Up)

* - Indicates Factory Settings

DIP SWITCH SETTINGS:

Dip Switch S1 (8 Position)

SWITCH  FUNCTION                   POSITION                             

  1     Parallel Port Enable     * On  = Enable
                                   Off = Disable                        
  2     Parallel Port Address    * On  = 378-37F hex (LPT1)
                                   Off = 278-27F hex (LPT2)             
  3     Serial Port Enable       * On  = Enable
                                   Off = Disable                        
  4     Serial Port Address      * On  = 3F8-3FF hex (COM1)
        For COM1 or COM2           Off = 2F8-2FF hex (COM2)
  4     Serial Port Address      ^ On  = 3E8-3EF hex (COM3)
        For COM3 or COM4           Off = 2E8-2EF hex (COM4)             
  5     Extended Parallel Port   * On  = Disable
        (Bidirectional Mode)       Off = Enable                         
  6     Diskette Drive Port      * On  = 3F0-3F7 hex (Primary)
        Address                    Off = 370-377 hex (Secondary)        
  7     SmartDrive Port Enable   * On  = Enable
                                   Off = Disable                        
  8     SmartDrive Port Address  * On  = (Primary)   1F0-1F7 for CS0
                                                     3F6-3F7 for CS1
                                   Off = (Secondary) 170-177 for CS0
                                                     376-377 for CS1    
* - Indicates Factory Settings
^ - See Serial Port ID Jumper Settings