
TANDON CORPORATION

MODEL 189370/199720

Processor              80286
Processor Speed        6/8/10MHz
Chip Set               Unidentified
Maximum Onboard Memory 3MB (2.5MB on external memory card)
Cache                  None
BIOS                   Unidentified
Dimensions             355mm x 305mm
I/O Options            Serial port, parallel port
NPU Options            80287

[Image]

                    CONNECTIONS

    Function      Label       Function      Label

  Serial port      CN1     Parallel port     CN2

                        USER CONFIGURABLE SETTINGS

                 Setting                      Label          Position

      Signal select DTR driven                 JP1           Pins 1 & 2
                                                              closed

      Signal select DTR true                   JP1           Pins 2 & 3
                                                              closed

      Signal select DTR false                  JP1             Open

      Signal select RTS driven                 JP2           Pins 1 & 2
                                                              closed

      Signal select RTS true                   JP2           Pins 2 & 3
                                                              closed

      Signal select RTS false                  JP2             Open

      Signal select DCD driven                 JP3           Pins 1 & 2
                                                              closed

      Signal select DCD true                   JP3           Pins 2 & 3
                                                              closed

      Signal select DCD false                  JP3             Open

      Signal select DSR driven                 JP4           Pins 1 & 2
                                                              closed

      Signal select DSR true                   JP4           Pins 2 & 3
                                                              closed

      Signal select DSR false                  JP4             Open

      Signal select CTS driven                 JP5           Pins 1 & 2
                                                              closed

      Signal select CTS true                   JP5           Pins 2 & 3
                                                              closed

      Signal select CTS false                  JP5             Open

     Factory configured - do not alter        JP6             Open
      (189370-001, 002)

     Factory configured - do not alter        JP6             Open
      (189370-004, 005/199270)

     Factory configured - do not alter        JP7             Open
      (189370-001, 002)

     Factory configured - do not alter        JP7           Pins 1 & 2
      (189370-004, 005/199270                                 closed

     Factory configured - do not alter        JP8           Pins 2 & 3
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP8           Pins 1 & 2
      (189370-004, 005/199270)                                closed

     Factory configured - do not alter        JP9           Pins 2 & 3
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP9           Pins 1 & 2
      (189370-004, 005/199270)                                closed

     Factory configured - do not alter        JP10          Pins 1 & 2
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP10            Open
      (189370-004, 005/199270)

     Factory configured - do not alter        JP11          Pins 1 & 2
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP11          Pins 1 & 2
      (189370-004, 005/199270)                                closed

     Factory configured - do not alter        JP12            Open
      (189370-001, 002)

     Factory configured - do not alter        JP12            Open
      (189370-004, 005/199270)

     Factory configured - do not alter        JP13          Pins 1 & 2
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP13          Pins 1 & 2
      (189370-004, 005/199270)                                closed

     Factory configured - do not alter        JP14          Pins 2 & 3
      (189370-001, 002)                                       closed

     Factory configured - do not alter        JP14          Pins 1 & 2
      (189370-004, 005/199270)                                closed

      0 wait state enabled (model 199720      SW1/1             On
      only)

      0 wait state disabled (model            SW1/1             Off
      199720 only)

     Factory configured - do not alter       SW1/2             N/A

     Video type select 80 characters         SW1/3             Off

     Factory configured - do not alter       SW1/4             Off

                    USER CONFIGURABLE SETTINGS (CONT)

                 Setting                     Label           Position

     Factory configured - do not alter      SW1/5             N/A

     Factory configured - do not alter      SW1/6             N/A

     Factory configured - do not alter      SW1/7             N/A

      512KB - 640KB RAM address enabled      SW1/8              On

      512KB - 640KB RAM address              SW1/8             Off
      disabled

                           DRAM

  Note: The orientation and chip sizes are unidentified.

[Image]

                                DRAM

    Size         Bank 0       Bank 1        Bank 2        Bank 3

    512KB      (18) 41256      None          None          None

     1MB       (18) 41256   (18) 41256       None          None

    1.5MB      (18) 41256   (18) 41256    (18) 41256       None

     2MB       (18) 41256   (18) 41256    (18) 41256    (18) 41256

                                DRAM SWITCH

     Memory      Memory after    SW1/1   SW1/2    SW1/3   SW1/4    SW1/5
    before

   512-640KB     2560-2688KB     Off      Off     Off      On       Off

    1024KB          3072KB       Off      Off     Off      On        On

  2560-2688KB    4608-4736KB     Off      Off      On      On       Off

    3072KB          5120KB       Off      Off      On      On        On

  4608-4736KB    6656-6784KB     Off      On      Off      On       Off

    5120KB          7168KB       Off      On      Off      On        On

  656-6784KB     8704-8832KB     Off      On       On      On       Off

    7168KB          9216KB       Off      On       On      On        On

                            DRAM SWITCH (CONT)

  Memory before    Memory after    SW1/1   SW1/2   SW1/3    SW1/4   SW1/5

   8704-8832KB     10752-10880KB    On      Off     Off      On      Off

     9216KB          11264KB        On      Off     Off      On      On

  10752-10880KB    12800-12928KB    On      Off     On       On      Off

     11264KB         13312KB        On      Off     On       On      On

  12800-12928KB    14848-14976KB    On      On      Off      On      Off

     13312KB         15360KB        On      On      Off      On      On

  14848-14976KB      15744KB        On      On      On       On      Off

     15360KB         15744KB        On      On      On       On      On

       MISCELLANEOUS TECHNICAL NOTE

  The location of pin 1 is unidentified.

