TANDY/RADIO SHACK

3000 NL

Processor              80286
Processor Speed        10MHz
Chip Set               Unidentified
Video Chip Set         None
Maximum Onboard Memory 8MB
Maximum Video Memory   None
Cache                  None
BIOS                   Unidentified
Dimensions             431mm x 400mm
I/O Options            External memory card
NPU Options            80287

[Image]

                  CONNECTIONS

  Purpose                      Location

  External memory card            SL1

                        USER CONFIGURABLE SETTINGS

                Function                     Label           Position

  »   Monitor type select monochrome           J3           Pins 1 & 2
                                                              closed

      Monitor type select color                J3           Pins 2 & 3
                                                              closed

  »   Floppy drive address select             S1/5              On
      primary

      Floppy drive address select             S1/5             Off
      secondary

                            DRAM CONFIGURATION

      Size          Bank 0         Bank 1        Bank 2         Bank 3

     512KB        (2) 256K x 9      None          None           None

     640KB        (2) 256K x 9   (2) 64K x 9      None           None

      1MB            None           None          None           None

     1.64MB          None        (2) 64K x 9      None           None

      2MB            None           None          None           None

     4.64MB          None        (2) 64K x 9      None           None

      5MB            None           None          None           None

      8MB            None           None          None           None

  Note: The location of banks 2 & 3 are unidentified.

                        DRAM CONFIGURATION (CON’T)

      Size         Bank 0A        Bank 1A       Bank 2A        Bank 3A

     512KB           None          None           None           None

     640KB           None          None           None           None

      1MB         (2) 256K x     (2) 256K x       None           None
                      9              9

     1.64MB       (2) 256K x       None        (2) 256K x    (2) 256K x 9
                      9                            9

      2MB         (2) 256K x     (2) 256K x    (2) 256K x    (2) 256K x 9
                      9              9             9

     4.64MB       (2) 256K x       None        (2) 1M x 9     (2) 1M x 9
                      9

      5MB         (2) 256K x     (2) 256K x    (2) 1M x 9     (2) 1M x 9
                      9              9

      8MB         (2) 1M x 9    (2) 1M x 9     (2) 1M x 9     (2) 1M x 9

  Note: Banks 0A, 1A, 2A, & 3A are located on the external memory card.

                        DRAM JUMPER CONFIGURATION

                Size                                  J7

                512KB                      Pins 2 & 3, 4 & 5 closed

                640KB                      Pins 2 & 3, 4 & 5 closed

                 1MB                       Pins 1 & 2, 5 & 6 closed

               1.64MB                      Pins 2 & 3, 5 & 6 closed

                 2MB                       Pins 1 & 2, 5 & 6 closed

               4.64MB                      Pins 2 & 3, 5 & 6 closed

                 5MB                       Pins 1 & 2, 5 & 6 closed

                 8MB                       Pins 1 & 2, 5 & 6 closed

  Note: Banks 0A, 1A, 2A, & 3A are located on the external memory card.

                     NPU SPEED SELECTION

        Speed                 J4                   J8

        8MHz           Pins 1 & 2 closed   Pins 1 & 3 closed

        10MHz          Pins 2 & 3 closed   Pins 3 & 4 closed

                              BIOS SELECTION

           Type                      J5                      J6

  »          27128            Pins 1 & 2 closed       Pins 2 & 3 closed

             27256            Pins 1 & 2 closed       Pins 1 & 2 closed

             27512            Pins 2 & 3 closed       Pins 1 & 2 closed

                        PARALLEL PORT IRQ SELECTION

          IRQ                   J1               S1/1           S1/2

  »         IRQ7             Pins 2 & 3           On             On
                              closed

            IRQ5             Pins 1 & 2           On             Off
                              closed

          Disabled              N/A              Off             N/A

                         SERIAL PORT IRQ SELECTION

          IRQ                   J2               S1/3           S1/4

  »         IRQ4             Pins 1 & 2           On             On
                              closed

            IRQ3             Pins 2 & 3           On             Off
                              closed

          Disabled              N/A              Off             N/A