
TMC RESEARCH CORPORATION

PAT48PR

Processor             80486SX/80487SX/80486DX/ODP486SX/80486DX2
Processor Speed       25/33/50(internal)/50/66(internal)MHz
Chip Set              OPTI
Max. Onboard DRAM     64MB
SRAM Cache            64/128/256KB
BIOS                  AMI
Dimensions            220mm x 240mm
I/O Options           32-bit VESA local bus slot (2)
NPU Options           None


[Image]

                                CONNECTIONS

  Purpose              Location      Purpose                  Location

  Speaker            J1/pins 1-4     IDE interface LED      J1 pins 10 &
                                                                 20

  Turbo switch      J1/pins 7 & 17   IDE interface LED           J2

  Turbo LED         J1/pins 8 & 18   External battery            J4

  Reset switch      J1/pins 9 & 19   32-bit VESA local        S1 & S2
                                     bus card (2)

                        USER CONFIGURABLE SETTINGS

                Function                      Jumper         Position

     CMOS memory normal operation             JP1           pins 2 & 3
      (internal battery)                                      closed

     CMOS memory normal operation             JP1             open
      (external battery)

      CMOS memory clear                        JP1           pins 1 & 2
                                                              closed

     Monitor type select color                JP4            closed

      Monitor type select monochrome           JP4             open

                            DRAM CONFIGURATION

   Size     Bank 0    Bank 1     Bank 2    Bank 3    RNB1 &      RNC1 &
                                                      RNB2
                                                                  RNC2

   1MB        (4)      NONE      NONE      NONE       open       closed
            256K x
              9

   2MB        (4)       (4)      NONE      NONE       open       closed
            256K x     256K x
              9          9

   4MB      (4) 1M     NONE      NONE      NONE       open       closed
             x 9

   4MB       NONE      NONE      (1) 1M    NONE      closed       open
                                 x 36

   5MB      (4) 1M      (4)      NONE      NONE       open       closed
             x 9       256K x
                         9

   6MB        (4)       (4)      (1) 1M    NONE       open       closed
            256K x     256K x    x 36
              9          9

   8MB      (4) 1M     (4) 1M    NONE      NONE       open       closed
             x 9        x 9

   8MB       NONE      NONE      (1) 1M    (1) 1M    closed       open
                                 x 36      x 36

   9MB        (4)      (4) 1M    (1) 1M    NONE       open       closed
            256K x      x 9      x 36
              9

   10MB       (4)       (4)      (1) 1M    (1) 1M     open       closed
            256K x     256K x    x 36      x 36
              9          9

   12MB     (4) 1M     (4) 1M    (1) 1M    NONE       open       closed
             x 9        x 9      x 36

   13MB       (4)      (4) 1M    (1) 1M    (1) 1M     open       closed
            256K x      x 9      x 36      x 36
              9

   16MB     (4) 1M     (4) 1M    (1) 1M    (1) 1M     open       closed
             x 9        x 9      x 36      x 36

   16MB     (4) 4M     NONE      NONE      NONE       open       closed
             x 9

   16MB      NONE      NONE      (1) 4M    NONE      closed       open
                                 x 36

   20MB     (4) 4M     (4) 1M    NONE      NONE       open       closed
             x 9        x 9

   20MB      NONE      NONE      (1) 4M    (1) 1M    closed       open
                                 x 36      x 36

   24MB     (4) 4M     (4) 1M    (1) 1M    NONE       open       closed
             x 9        x 9      x 36

   28MB     (4) 4M     (4) 1M    (1) 1M    (1) 1M     open       closed
             x 9        x 9      x 36      x 36

   32MB     (4) 4M     (4) 4M    NONE      NONE       open       closed
             x 9        x 9

   32MB      NONE      NONE      (1) 4M    (1) 4M    closed       open
                                 x 36      x 36

   36MB     (4) 4M     (4) 4M    (1) 1M    NONE       open       closed
             x 9        x 9      x 36

   40MB     (4) 4M     (4) 4M    (1) 1M    (1) 1M     open       closed
             x 9        x 9      x 36      x 36

   48MB     (4) 4M     (4) 4M    (1) 4M    NONE       open       closed
             x 9        x 9      x 36

   52MB     (4) 4M     (4) 4M    (1) 4M    (1) 1M     open       closed
             x 9        x 9      x 36      x 36

   52MB     (4) 4M     (4) 1M    (1) 4M    (1) 4M     open       closed
             x 9        x 9      x 36      x 36

   64MB     (4) 4M     (4) 4M    (1) 4M    (1) 4M     open       closed
             x 9        x 9      x 36      x 36

                            SRAM CONFIGURATION

     Size          Cache         Location      TAG(U43)       TAG(U44)

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

     128KB      (4) 32K x 8       Bank 0      (1) 8K x 8     (1) 64K x 1

     256KB      (8) 32K x 8    Banks 0 & 1    (1) 32K x 8    (1) 64K x 1

      SRAM RESISTOR CONFIGURATION

   Size      RND       RNE       RNF

   64KB     closed    open      open

  128KB      open    closed     open

  256KB      open     open     closed

           CPU JUMPER CONFIGURATION

    CPU        RNA3        RNB3        RNC3

  80486DX2    closed       open        open

  ODP486SX     open       closed       open

  80486DX     closed       open        open

  80487SX      open       closed       open

  80486SX      open        open       closed

                 VESA CARDS SUPPORTED JUMPER CONFIGURATION

  # of VESA cards          W21                W22               W23

        2                closed             closed           pins 1 & 2
                                                              closed

        1            W21/pin 1 connected to W22/pin1         pins 2 & 3
                                                               closed

  Note: The manufacturer recommends that only one VESA card be used with
  a 486DX-50MHz.

                      CPU SPEED JUMPER CONFIGURATION

    CPU       JP2     JP3      JP5 &     W13     W14      W15       W16
                                JP6

   25MHz      pins    pins     open      open    open   closed     open
             2 & 3    1 & 2

   33MHz      pins    pins     open      open    open    open     closed
             2 & 3    1 & 2

  50iMHz      pins    pins     open      open    open   closed     open
             2 & 3    1 & 2

   50MHz      pins    pins    closed     open    open   closed     open
             1 & 2    2 & 3

  66iMHz      pins    pins     open      open    open    open     closed
             2 & 3    1 & 2

  Note:W13 - W16 need only be configured if a 20-pin clock generator is
  installed in U29.

  JP3 is AT bus clock select.

  JP5 and JP6 are VESA bus clock select.

  Pins designated are in the closed position.

