32 bit ----------------------------------------------------------

            Sigma Sigma Sigma Sigma Sigma Sigma Sigma Xerox Xerox
              7     5     6     9     8   9Mod3 9Mod2  550   560
            ----- ----- ----- ----- ----- ----- ----- ----- -----
announcement 3/66                                      2/74  2/74
installation12/66  8/67  6/70 10/71  2/72 mid73   ?    4Q74  4Q74

all are 32 bit computers
floating pt. opt   opt   opt   std   std   std   std    ?    std
decimal      opt    --   std   std    --    --   std    ?    std
byte string  std    --   std   std    ?     ?     ?     ?    std
max memory   128K  128K  128K  512K  128K  512K  256K   ?    256K
memory map   opt    --   std   std    --   std   std    ?    std
look-ahead    1     0     1     2     2     2     2     ?     ?
max reg blk  32    16    32     4     4     4     4     4     4
max ext blk  14    14    14    14    14    14    14     4*    4*
watch-dog timer standard on all
fixed point 32 bit binary arithmetic
  AW,SW,CW    2.0   2.0   2.0   0.7   0.7   0.7   1.1
  MW          5.0   7.2   5.0   3.8   3.8   3.8   5.2
  DW         12.6  15.8  12.6   9.5   9.5   9.5  17.8
  LW          1.8   2.0   1.8   0.7   0.7   0.7   1.0
  STW         2.6   2.5   2.6   1.5   1.5   1.5   2.3
floating point arithmetic
  FAS,FSS     3.3   4.8   3.3   2.2   2.2   2.2   4.0
  FMS         6.0  10.0   6.0   4.0   4.0   4.0   5.5
  FDS        12.4  14.0  12.4   7.7   7.7   7.7  15.0
  FAL,FSL     4.1   9.0   4.1   2.7   2.7   2.7   4.1
  FML         9.1  16.0   9.1   7.0   7.0   7.0   8.6
  FDL        25.4  25.3  25.4  17.4  17.4  17.4  30.5
decimal arithmetic
  DA         19.4+.3D           5.8+.4D
  DM         62.3+.4DN         38.2+.28DN
  DD         30.8+.8K          18.5+.5K
byte string
  MBS         4.2+3.4N          7.6+.6N         8.6+1.1N
  WA             +0.8N
  CBS         4.1+3.9N          7.6+.6N +1.1N   8.6+1.1N
  
  AW  - Add Word            FAS - Floating Add Short
  SW  - Subtract Word       FSS - Floating Subtract Short
  CW  - Compare Word        FMS - Floating Multipy Short
  MW  - Multiply Word       FDS - Floating Divide Short
  LW  - Load Word           FAL - Floating Add Long
  STW - Store Word          FSL - Float Short [sic s/b Subtract] Long
  DA  - Decimal Add         FML - Floating Multiply Long
  DM  - Decimal Multiply    FDL - Floating Divide Long
  DD  - Decimal Divide      MBS - Move Byte String
                            CBS - Compare Byte String
  WA  - Word aligned MBS
  D   - Number of non-zero digits
  N   - number of bytes/digits
  K   - (D+6)(16-Q)
  Q   - Number of leading zeros in quotient                            


16 bit --------------------------------------------

Computer             Sigma 2    Sigma 3   Xerox 530
                     -------    -------    -------

Announcement        Aug 1966   Jan 1969    Jan 1973                           
Installation        Jan 1967   Jul 1969    Jul 1973                     

all are 16-bit
max memory is 64K

fixed point binary
    16 bit ADD                                1.92
    32 bit ADD                     3.2
    16x16  MUL                     7.8        8.0
    16/32  DIV                     8.1       13.4
    
floating point
           ADD          ---        ---       10.7
           MUL          ---        ---       32.96
           DIV          ---        ---       77.56
           
max ext int             132                     24
Standard Instructions   35          37          67
Optional Instructions    2 MUL,DIV   0           7 floating
                                                 8 field addressing
                                                   (bit string)
                                                   
Price
      Sep 66       26,000        
      Jun 75                    31,500      20,000
      Jan 84        3,000        3,000       7,500
      
    Times are in microseconds
    Prices are in dollars and include CPU, memory and I/O only (no peripherals)

