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                  Inboard 386 Technical Information                       
                                                                          
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 ARCHITECTURE

     The Inboard 386 uses a replacement architecture.  This means that you
     remove the 80286 from your system and replace it with a cable that runs
     to the Inboard 386.

 CHIPS & TECHNOLOGIES BENCHMARK PROGRAM - VER. 1.20

     For this testing, the Inboard 386 resided in an IBM PC AT/339 and
     filled conventional memory from 256K to 640K.  A separate routine was
     used to fill the first 300K of memory to ensure that test ran solely in
     Inboard 386 memory.

     The following table shows the Inboard 386's performance relative to an
     IBM PC, IBM PC AT, and COMPAQ Deskpro 386.

                            Ŀ
                              IBM PC   IBM PC AT  COMPAQ Inboard
                             4.77 MHz    8 Mhz    386/16   386  
     ͵
      General Instructions     7.40      2.15     1.09   1.22  
     Ĵ
      Integer Instructions    15.27      2.39     1.05   2.57  
     Ĵ
      Memory to Memory         5.68      1.75     0.98   1.35  
     Ĵ
      Register to Register    19.07      2.48     1.04   3.43  
     Ĵ
      Register to Memory       6.14      1.84     1.02   1.89  
     Ĵ
      Overall Performance      8.75      2.11     1.04   2.09  
     

 NORTON UTILITIES SYSTEM INFORMATION (SI) BENCHMARK

     Norton Utilities Version 3.10 has two versions of the SYSINFO (SI)
     program.  One is 7,056 bytes and dated 11/15/86; the other is 7,216
     bytes and is dated 1-03-86.  Intel ran its benchmarks using the
     11/15/86 version of SI.

     If you receive different performance ratings when running this program,
     check the date and size of the program -- it may not be the same
     version Intel used.

     For this testing, the Inboard 386 resided in an IBM PC AT/339.  The
     following table shows the Inboard 386's performance relative to an IBM
     PC AT and IBM PS/2 Model 60.

                       Ŀ
                          IBM PC      IBM PS/2     IBM PC AT/339  
                          AT/339      Model 60    with Inboard 386
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      Dhrystones          1428         1785           3571       
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      PC Tech Journal                                            
      busperf             4.51          5.67          13.32      
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      Hard disk                                                  
      average seek       34.7ms        37.2ms         34.7ms     
     Ĵ
      Effective disk                                             
      transfer rate     170Kb/sec     256Kb/sec      170Kb/sec   
     Ĵ
      MIPS                0.96          1.21           2.09      
     Ĵ
      SI 3.0              7.7           10.1           18.7      
     

     Notes:

     1.  Dhrystones are an industry standard measure of CPU and memory
         subsystem performance.

     2.  Busperf is the expansion bus performance benchmark that gives a
         number relative to the bus on a 4.77-MHz IBM PC.  The number for
         Inboard 386 indicates that access to the memory on the Inboard 386
         is very fast.

     3.  Effective disk transfer rate for PS/2 is greater because of the 2:1
         interleave.  The same performance can be achieved with the IBM PC
         AT or IBM PC AT with Inboard 386 if a low-level format is done to
         change the interleave from 3:1 to 2:1.

     4.  MIPS means millions of instructions per second.

     5.  SI is a function of CPU clock rate.

 POWER CONSUMPTION

     The Inboard 386 and its options consume the following amounts of power:

        Inboard 386 with 1M byte of memory: 3.6 amps at +5 volts
        Math Module: 1.1 amps at +5 volts
        Piggyback Option with 2M bytes of memory: .5 amps at +5 volts

     Removing the 80286 and 80287 from the motherboard reduces the original
     system power consumption by .8 amps.

     NOTE:   Any half-sized card that shares the slot with the Piggyback
             memory card will consume less than a full card's power.  Also,
             many expansion cards don't use their full allocation of power.

 WAIT STATES

     A wait state is an extra timing cycle that a faster CPU uses to
     synchronize with slower memory.  The Inboard 386 uses the following
     number of 16-MHz, 32-bit wait states:

        For accessing the cache:  0 wait states
        For accessing memory on Inboard 386 and the Piggyback Option: 2
         wait states
        For accessing other system memory: 8 to 9 wait states



End of file                 Intel FaxBack # 2010          June 25,1992
