
TANDY/RADIO SHACK

4100 MT

Processor      80486SX/ODP486SX/80487SX/80486DX/80486DX2/ODP486DX2
Processor      25/33/50(internal)/66(internal)MHz
Speed
Chip Set       Unidentified
Video Chip Set ATI
Maximum        64MB
Onboard Memory
Maximum Video  2MB
Memory
Cache          64/256KB
BIOS           Unidentified
Dimensions     330mm x 218mm
I/O Options    Floppy drive interface, IDE interface, VGA feature connector
NPU Options    None

[Image]

                                CONNECTIONS

  Purpose                   Location   Purpose                   Location

  IDE interface               J22      Floppy drive interface      J24

  VGA feature connector       J23

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

      On board video enabled                 SW1/1             Off

      On board video disabled                SW1/1              On

     Factory configured - do not alter      SW1/2             Off

     Factory configured - do not alter      SW1/3             Off

      Password enabled                       SW1/4             Off

      Password disabled                      SW1/4              On

      Monitor type select color              SW1/5              On

      Monitor type select monochrome         SW1/5             Off

     Factory configured - do not alter      SW1/6             Off

     Factory configured - do not alter      SW1/7             Off

      Setup access enabled                   SW1/8             Off

      Setup access disabled                  SW1/8              On

                            DRAM CONFIGURATION

     Size         Bank 0         Bank 1         Bank 2         Bank 3

     1MB        (1) 256K x        None           None           None
                    36

     2MB        (1) 256K x     (1) 256K x        None           None
                    36             36

     3MB        (1) 256K x     (1) 256K x     (1) 256K x        None
                    36             36             36

     4MB        (1) 256K x     (1) 256K x     (1) 256K x    (1) 256K x 36
                    36             36             36

     4MB       (1) 1M x 36        None           None           None

     5MB       (1) 1M x 36     (1) 256K x        None           None
                                   36

     6MB       (1) 1M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     7MB       (1) 1M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     8MB       (1) 1M x 36    (1) 1M x 36        None           None

     9MB       (1) 1M x 36    (1) 1M x 36     (1) 256K x        None
                                                  36

     10MB      (1) 1M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

     12MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36        None

     13MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

     16MB      (1) 1M x 36    (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     16MB      (1) 4M x 36        None           None           None

     17MB      (1) 4M x 36     (1) 256K x        None           None
                                   36

     18MB      (1) 4M x 36     (1) 256K x     (1) 256K x        None
                                   36             36

     19MB      (1) 4M x 36     (1) 256K x     (1) 256K x    (1) 256K x 36
                                   36             36

     21MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x        None
                                                  36

     22MB      (1) 4M x 36    (1) 1M x 36     (1) 256K x    (1) 256K x 36
                                                  36

     24MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36        None

     25MB      (1) 4M x 36    (1) 1M x 36    (1) 1M x 36    (1) 256K x 36

                        DRAM CONFIGURATION (CONT)

     Size         Bank 0        Bank 1         Bank 2          Bank 3

     28MB       (1) 4M x 36   (1) 1M x 36    (1) 1M x 36     (1) 1M x 36

     32MB       (1) 4M x 36   (1) 4M x 36       None            None

     33MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x        None
                                                 36

     34MB       (1) 4M x 36   (1) 4M x 36     (1) 256K x    (1) 256K x 36
                                                 36

     36MB       (1) 4M x 36   (1) 4M x 36    (1) 1M x 36        None

     37MB       (1) 4M x 36   (1) 4M x 36    (1) 1M x 36    (1) 256K x 36

     48MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36        None

     49MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36    (1) 256K x 36

     52MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36     (1) 1M x 36

     64MB       (1) 4M x 36   (1) 4M x 36    (1) 4M x 36     (1) 4M x 36

            CACHE CONFIGURATION

     Size          Bank 0          TAG

     64KB        (8) 8K x 8    (1) 8K x 8

     256KB       (8) 32K x 8   (1) 32K x 8

  CACHE JUMPER CONFIGURATION

   Size       E7        E8

   64KB      Open      Open

  256KB     Closed    Closed

                        VIDEO MEMORY CONFIGURATION

            Note: Board accepts 512KB/2MB of video memory. The size of
            the chips are unidentified. The number of banks is
            unidentified.

                            CPU TYPE SELECTION

    Type          E9          E10         E11          E12         E13

   80486SX       Open        2 & 3       1 & 2         Open       2 & 3

  ODP486SX      1 & 2        1 & 2       2 & 3        Closed      2 & 3

   80487SX      1 & 2        1 & 2       2 & 3        Closed      2 & 3

   80486DX      2 & 3        1 & 2       1 & 2        Closed      2 & 3

  80486DX2      2 & 3        1 & 2       1 & 2        Closed      2 & 3

  ODP486DX2     1 & 2        1 & 2       2 & 3        Closed      1 & 2

  Note: Pins designated should be in the closed position.

