TEXAS INSTRUMENTS

BUSINESS PRO-MLB1-2

Processor         80286
Processor Speed   6/8/10/12/16/20MHz
Chip Set          Texas Instruments
Max. Onboard DRAM 640KB
Cache             None
BIOS              Texas Instruments
Dimensions        220mm x 270mm
I/O Options       Memory card, parallel port, serial port
NPU Options       80287

[Image]

                                CONNECTIONS

  Purpose                  Location     Purpose               Location

  Expansion bus               J2        64KB module           J18 & J19
  connector

  Expansion RAM               J3        64KB module           J16 & J17
  interface connector

  Serial port                 J8        256KB module          J14 & J15

  Parallel port               J9        256KB module          J16 & J17

                        USER CONFIGURABLE SETTINGS

             Function                 Jumper/Switch         Position

  »   Speaker select external            E1 & E3           Connected to
                                                             speaker

      Speaker select monitor             E1 & E2             closed

  »   Factory configured - do              F1                  N/A
      not alter

  »   Factory configured - do              J1                  N/A
      not alter

  »   Monitor type select color       SW1/switch 1             on

      Monitor type select             SW1/switch 1             off
      monochrome

  »   Parallel port select LPT1       SW1/switch 2             off

      Parallel port select LPT2       SW1/switch 2             on

  »   Serial port select COM1         SW1/switch 3             off

      Serial port select COM2         SW1/switch 3             on

                            DRAM CONFIGURATION

     Size            Bank 0              Bank 1           SW1/Switch 1

    512KB       (2) 256KB Modules         NONE                off

    640KB       (2) 256KB Modules   (2) 64KB Modules           on

                     MAIN LOGIC BOARD SELF-TEST LED’S

    Green        Yellow        Blue        Item failed         Message

     On            On           On             CPU              None

     On            On           Off          8142 test          None
                                             keyboard

     On            Off          On         8254 Timer 1         0001
                                               test

     On            Off          Off       ROM CRC check         0002

     Off           On           On        CMOS RAM test         0003

     Off           On           Off        Mem. refresh         0004
                                               test

     Off           Off          On        0-256K RAM test       0005

     Off           Off          Off       Turbo mode test       0006

     Off           Off          Off        Turbo parity         0008
                                              error

     Off           Off          On        Nonturbo partiy       0008
                                              error

     On            On           On          8259 test           0007

     Off           Off          Off         8254 timer          0012
                                            interrupt

     On            On           Off       Protected mode        0020
                                               test

     On            Off          On         8254 timer 2         0001
                                               test

     On            Off          Off          DMA test           0051