
TMC RESEARCH CORPORATION

PET48PN

Processor            80486SX/80487SX/80486DX/ODP487SX/80486DX2
Processor Speed      20/25/33/40(internal)/50(internal)/50/66(internal)MHz
Chip Set             OPTI
Max. Onboard DRAM    128MB
SRAM Cache           64/128/256/512KB
BIOS                 AMI
Dimensions           220mm x 240mm
I/O Options          32-bit VESA card slot (2)
NPU Options          None


[Image]

                                CONNECTIONS

  Purpose                Location      Purpose                Location

  IDE interface LED         J4         Reset switch         J5 pins 9 and
                                                                 19

  Speaker              J5 pins 1-4     IDE interface LED   J5 pins 10 and
                                                                 20

  Turbo switch         J5 pins 7 and   32-bit VESA card       S1 & S2
                            17         (2)

  Turbo LED            J5 pins 8 and
                            18

                        USER CONFIGURABLE SETTINGS

                Function                     Jumper          Position

     Monitor type select color                JP5            closed

      Monitor type select monochrome           JP5             open

     Channel ready select normal              JP7             open

      Channel ready select EXRDY signal        JP7            closed
      generated

                            DRAM CONFIGURATION

   Size     Bank 0   Bank 1   Bank 2   Bank 3   RNE1-RNE5      RNF1-RNF5

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

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

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

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

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

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

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

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

   16MB     NONE     NONE     NONE     NONE       closed         open

   20MB     (4) 4M   (4) 1M   (1) 4M   NONE        open         closed
             x 9      x 9     x 36

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

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

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

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

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

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

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

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

   40MB     (4) 4M   NONE     (1) 1M   (1) 4M      open         closed
             x 9              x 36     x 36

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

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

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

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

  128MB      (4)      (4)     NONE     NONE       closed         open
            16M x    16M x
              9        9

                  SRAM RESISTOR CONFIGURATION

    Size      RNA1/RNA2    RNB1/RNB2    RNC1/RNC2    RND1/RND2

    64KB        closed        open        open         open

    128KB        open        closed       open         open

    256KB        open         open       closed        open

    512KB        open         open        open        closed

                            SRAM CONFIGURATION

    Size       Cache SRAM     Location        TAG(U43)        TAG(U44 &
                                                                U55)

    64KB       (8) 8K x 8    Banks 0 & 1     (1) 8K x 8      (2) 16K x 1

    128KB      (4) 32K x       Bank 0        (1) 8K x 8      (2) 16K x 1
                   8

    256KB      (8) 32K x     Banks 0 & 1     (1) 32K x 8     (2) 16K x 1
                   8

    512KB      (4) 128K x      Bank 0        (1) 32K x 8     (2) 64K x 1
                   8

           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

                             CPU SPEED JUMPER CONFIGURATION

       CPU          JP2  JP3   JP4    JP8      JP9      W7       W8       W9       W10

      20MHz         1 &  1 &   2 &    open     open    open     closed   open     open
                    2     2     3

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

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

  40(internal)MHz   1 &  1 &   2 &    open     open    open     closed   open     open
                    2     2     3

  50(internal)MHz   1 &  1 &   2 &    open     open    open     open     closed   open
                    2     2     3

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

  66(internal)MHz   1 &  2 &   2 &    open     open    open     open     open     closed
                    2     3     3

  Note:JP8 and JP9 are VESA bus speed select. W7 - W10 are clock source jumpers.

