DTK Computers

     Technical Information Sheet for PEM2500                     Page 1
     S=shorted, O=open               DIP switch 1=on 0=off
     Utility Diskette is UTILDSK3.1_0
     Uses 32bit Memory Board PEI-306

     Total 32bit memory SW1 1,2,3    MotherBoard Total Memory SW1 4,5
        MB         1 2 3               4  5  Memory Bank 0  Bank 1
       1,2         1 1 1               1  1   2MB    1MB     1MB
       3,4         1 1 0               1  0   4MB    4MB     0MB
       5,6         0 1 1               0  1   5MB    1MB     4MB
       7,8         0 1 0               0  0   8MB    4MB     4MB
       9,10,11,12  0 0 1
       13,14,15,16 0 0 0             Video Selection SW1 6
                                       SW1-6  Selection
     J1:Keyboard lock                   1     Color
        <1> Power LED                   0     Monochrome
        <2> Key
        <3> Ground                   J2:Reset Switch
        <4> Keyboard inhibit            <1> Hardware Reset
        <5> Ground                      <2> Ground
     
     J3:Speaker connector            J4:Turbo LED
        <1> Speaker                     <1> LED +
        <2> N.C.                        <2> LED -
        <3> Ground
        <4> Vcc                      J5:Turbo Switch Connector
                                        1-2  S  10 Mhz
     W1-W6:SIMM Bank #                  2-3  S  Keyboard Control
         1-2 S SIMM's are Bank 0        No Cap  25 MHz always
         2-3 S SIMM's are Bank 1
                                     
     W7:Bank 0 DRAM type             W8:Bank 1 DRAM type
        1-2 S  1mBIT                    1-2 S  1Mbit
        2-3 S  256kbit                  2-3 S  256kbit
                                     
     W9-10:Cache Size                W11:8 bit Adapter Wait States
         1-2 S   64K                     1-2 S  7 WS
         2-3 S  256K                     2-3 S  5 WS

     W12:16bit Adapter Wait State    W13:DMA&I/O Bus Clock Select
         1-2 S  3 WS                     1-2 S  6Mhz DMA 12MHz Bus
         2-3 S  1 WS                     2-3 S  3Mhz DMA 6MHz Bus

     W14:Coprocessor Select
         S  Not Installed
         O  Installed

     J8:Power Connector
        <1> +5VDC                 <7>  Ground
        <2> +5VDC                 <8>  Ground
        <3> +5VDC                 <9> -12VDC
        <4> -5VDC                <10> +12VDC
        <5>  Ground              <11> +5VDC
        <6>  Ground              <12>  Power Good

     
     
     
     
     
     
     
     
     
     DTK Computers

     Technical Information Sheet for PEM2500                     Page 1
     S=shorted, O=open               DIP switch 1=on 0=off
     
     RAM Installation
     RAM   DRAM Type                                   SW1
     Size  Bank 0           Bank 1            W1~W6  1 2 3 4 5  W7  W8
     1MB   44256x8+41256x4  none               2-3   1 1 1 1 1  2-3 2-3
           256Kbitx4 SIP    none               1-2   1 1 1 1 1  2-3 2-3 
     2MB   44256x8+41256x4  44256x8+41256x4    2-3   1 1 1 1 1  2-3 2-3 
           44256x8+41256x4  256Kbitx4 SIP      2-3   1 1 1 1 1  2-3 2-3 
           256Kbitx4 SIP    44256x8+41256x4    1-2   1 1 1 1 1  2-3 2-3 
     4MB   41100x36         none               2-3   1 1 0 1 0  1-2 1-2
           1Mbitx4 SIP      none               1-2   1 1 0 1 0  1-2 1-2
     5MB   44256x8+41256x4  1Mbitx4 SIP        2-3   0 1 1 0 1  2-3 1-2 
     8MB   1Mbitx4 SIP      1Mbitx4 SIP        2-3   0 1 0 0 0  1-2 1-2