3000 E  (250-4002)           Settings             Faxback Doc. # 1032

Below are main logic board switch settings for the Tandy 3000 E :

* Denotes user changeable options.

Caution:  Some of these jumper options should NEVER be changed,
          DO NOT tell a customer to change a jumper unless you know
          the purpose of that jumper setting.

Monitor Type*
E1-E2     Selects color video option
E2-E3     Selects monochrome video option (standard)

Memory Size*
E12-E13     E14-E15     RAM
-----------------------------
ON          ON          256K
ON          OFF         512K
OFF         ON          640K  (standard)

Serial Port*
E20-E21     Enables on board serial port
E26-E27     ON   selects COM-1   (standard)
            OFF  selects COM-2
E34-E35     IRQ 4 selected   (standard)
E35-E36     IRQ 3 selected

Parallel Port*
E18-E19     Enables onboard parallel port
E24-E25     ON   selects LPT-1  (standard)
            OFF  selects LPT-2
E38-E39     IRQ 7 selected   (standard)
E37-E38     IRQ 5 selected

FDC Select*
E16-E17     Enables on board FDC   (standard)
E22-E23     ON   selects primary address   (standard)
            Off  selects secondary address   (standard)

ROM Size
E31-E32 & E40-E41   512K  (standard)
E31-E32 & E41-E42   256K  (do not use)
E32-E33 & E41-E42   128K  (do not use)

Processor Clock Speed
E9-E10     Selects 6 MHZ processor clock speed
E10-E11    Selects 12 MHZ processor clock speed
E9-E10-E11 Removed allows for software selectable clock speed  (standard)

Co-Processor Clock Speed
E43-E44 & E47-E48     6MHZ
E44-E45 & E48-E49     8MHZ  (standard)
E44-E46 & E47-E48     10MHZ (8MHZ effective operation)
E44-E45 & E48-E49     10MHZ (with 10MHZ oscillator)

8-BIT Wait States
E28-E29     2 wait states
E29-E30     3 wait states (standard)
E28-E29-E30 Removed 4 wait states

DMA Select
E4-E5     Selects 6MHZ DMA clock
E7-E8     OFF  sets precomp to 120 nsec   (standard)
          ON   sets precomp to 187 nsec


(smm 08/06/93)