DTK Computers

     Technical Information Sheet for PEM2501/3301/4001
     S=shorted, O=open               DIP switch 1=on 0=off
     Utility Diskette is UTILDSK4.1_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:Turbo LED
        <4> Keyboard inhibit            <1> +5V
        <5> Ground                      <2> Indicate pin
     
     J3:Reset Switch                 J4:Speaker connector
        <1> Hardware Reset              <1> Data out
        <2> Ground                      <2> N.C.
                                        <3> Ground
     W1:Coprocessor Select              <4> Vcc                      
        S  Not Installed
        O  Installed                 W2:Bank 0 DRAM Type
                                        1-2 S  1mBIT
     W3:Bank 1 DRAM type                2-3 S  256kbit
        1-2 S  1Mbit
        2-3 S  256kbit               W4&W5:Cache RAM Size
                                        1-2 S   64kb (10 16kx4 SRAM)
     J5:Turbo Switch Connector          2-3 S  256kb (10 64kx4 SRAM)
        1-2  S  Normal
        2-3  S  Keyboard Control     W7:BIOS Rom Size
        No Cap  25 MHz always           1-2 S  64k (27256x2)
                                        2-3 S 128k (27512x2)
     RAM Installation 
     RAM   DRAM Type 
     Size  Bank 0          Bank1
     1MB   256Kbitx4 SIMM  none
     2MB   256Kbitx4 SIMM  256Kbitx4 SIMM  
     4MB   1Mbitx4 SIMM    none
     5MB   256Kbitx4 SIMM  1Mbitx4 SIMM    
     8MB   1Mbitx4 SIMM    1Mbitx4 SIMM    
     
     J8:Power Connector
        <1>  Power Good           <7>  Ground
        <2> +5VDC                 <8>  Ground
        <3> +12VDC                <9> -5VDC
        <4> -12VDC               <10> +5VDC
        <5>  Ground              <11> +5VDC
        <6>  Ground              <12> +5VDC