
UNIDENTIFIED

486TC4

Processor         80486SX/80487SX/80486DX
Processor Speed   20/25/33MHz
Chip Set          C & T
Max. Onboard DRAM 32MB
SRAM Cache        64/128/256KB
BIOS              AMI
Dimensions        330mm x 218mm
I/O Options       32-bit external memory card slot
NPU Options       4167

[Image]

                                CONNECTIONS

  Purpose                 Location     Purpose                  Location

  External battery           JP2       Turbo LED                  JP10

  Speaker                    JP7       Turbo switch               JP11

  Power LED & keylock        JP8       32-bit external             S1
                                       memory card

  Reset switch               JP9

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Factory configured - do not alter        J3             unknown

     Factory configured - do not alter        J4             unknown

     Battery select internal                  JP1            closed

      Battery select external                  JP1             open

     CMOS memory normal operation             JP3           pins 1 & 2
                                                              closed

      CMOS memory clear                        JP3           pins 2 & 3
                                                              closed

     Monitor type select color                JP4           pins 1 & 2
                                                              closed

      Monitor type select monochrome           JP4           pins 2 & 3
                                                              closed

     Factory configured - do not alter        JP5            unknown

     Factory configured - do not alter       JP15            unknown

                         CPU JUMPER CONFIGURATION

        CPU               JP12              JP13               JP16

      80486DX          pins 2 & 3         pins 2 & 3          closed
                         closed            closed

      80487SX          pins 1 & 2         pins 2 & 3          closed
                         closed            closed

      80486SX          pins 2 & 3         pins 1 & 2           open
                         closed            closed

                         SRAM JUMPER CONFIGURATION

      Jumper             64KB              128KB              256KB

       SR1            pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR2            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR3            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR4            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR5            pins 1 & 2         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR6            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR7            pins 2 & 3         pins 2 & 3         pins 1 & 2
                        closed            closed             closed

       SR8            pins 2 & 3         pins 2 & 3         pins 2 & 3
                        closed            closed             closed

       SR9            pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR10           pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

       SR11           pins 1 & 2         pins 1 & 2         pins 2 & 3
                        closed            closed             closed

                            SRAM CONFIGURATION

  Size     Cache SRAM        Location         TAG (U35)       TAG (U37)

  32KB     (4) 8K x 8         Bank 0         (1) 8K x 8         NONE

  64KB     (8) 8K x 8      Banks 0 & 1       (1) 8K x 8      (1) 8K x 8

  128KB    (4) 32K x 8        Bank 0         (1) 8K x 8         NONE

  256KB    (8) 32K x 8     Banks 0 & 1       (1) 8K x 8      (1) 8K x 8

                            DRAM CONFIGURATION

       Size            Bank 0            Bank 1               JP6

       1MB          (4) 256K x 9          NONE         pins 1 & 2 closed

       2MB          (4) 256K x 9      (4) 256K x 9     pins 1 & 2 closed

       4MB           (4) 1M x 9           NONE         pins 1 & 2 closed

       5MB           (4) 1M x 9       (4) 256K x 9     pins 2 & 3 closed

       8MB           (4) 1M x 9        (4) 1M x 9      pins 1 & 2 closed

       16MB          (4) 4M x 9           NONE         pins 1 & 2 closed

       17MB          (4) 4M x 9       (4) 256K x 9     pins 2 & 3 closed

       20MB          (4) 4M x 9        (4) 1M x 9      pins 2 & 3 closed

       32MB          (4) 4M x 9        (4) 4M x 9      pins 1 & 2 closed

