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4/6xx motherboard VME 0M

 Up to two Mbus modules. 20MHz SBus.

 From left to right, with the component side up and the connector side toward
  you (normal top edge at the left), the rear edge of the board has: eleven
  LEDs (bit 0 to the right/bottom); a switch to toggle between Normal and
  Diagnostic modes; a "scan" button; two serial ports (A and B from left to
  right (top/bottom)); a keyboard/mouse connector; an audio connector; an
  Ethernet connector; and a 50-pin SCSI-2 connector.

 Memory consists of up to thirty-two 4M (501-1739) or 16M (501-2060) x 9 80ns
  30-pin SIMMs in two banks of 16 each.  Bank 0 is on the left (starts with
  U1107, ends with U1401), bank 1 is on the right (starts with U1108, ends with
  U1402).  Banks cannot be partially filled.  The chart in the FE manual looks
  like this, for whatever it's worth:

              Bank 0          Bank 1
          U????  LO/HI    U????  LO/HI            bits
  near    -----  -----    -----  -----            ----
   VME    U1401   7L1     U1402   7H1             56-63
          U1201   7L0     U1202   7H0             56-63
          U1403   6L1     U1404   6H1             48-55
          U1203   6L0     U1204   6H0             48-55
          U1405   5L1     U1406   5H1             40-47
          U1205   5L0     U1206   5H0             40-47
          U1407   4L1     U1408   4H1             32-39
          U1207   4L0     U1208   4H0             32-39

          U1301   3L1     U1302   3H1             24-31
          U1101   3L0     U1102   3H0             24-31
          U1303   2L1     U1304   2H1             16-23
          U1103   2L0     U1104   2H0             16-23
          U1305   1L1     U1306   1H1             8-15
          U1105   1L0     U1106   1H0             8-15
  near    U1307   0L1     U1308   0H1             0-7
   SBus   U1107   0L0     U1108   0H0             0-7
                    | xx0 = LO byte, xx1 = HI byte

 There are a variety of jumpers. Locations below are given with component side
  up and connector edge toward you.

  J1701 (single jumper in far left)
   Jump to enable internal VME arbiter                            JUMPED

  J1702 (single jumper in far leftish)
   Jump to enable internal VME arbiter                            JUMPED

  J1703 (single jumper in far middle)
   Jump to enable internal VME arbiter                            JUMPED

  J1704 (single jumper in far rightish)
   Jump to enable internal VME arbiter                            JUMPED

  J1705 (single jumper in middle)
   Jump to disable internal VME arbiter                           UNJUMPED

  J1706 (3-pin jumper in leftish far edge, pin 1 nearest)
   1-2    Connect P1.SYSRST to VME.RST.IN
   2-3    Connect VME.RST.OUT to P1.SYSRST                        JUMPED

  J1801 (block in far right corner, pin 1 to left)
   1-2    Enable VME IRQ7                                         JUMPED
   3-4    Enable VME IRQ6                                         JUMPED
   5-6    Enable VME IRQ5                                         JUMPED
   7-8    Enable VME IRQ4                                         JUMPED
   9-10   Enable VME IRQ3                                         JUMPED
   11-12  Enable VME IRQ2                                         JUMPED
   13-14  Enable VME IRQ1                                         JUMPED
   15-16  unused

  J1802 (single jumper in rightish far edge)
   Jump to enable 16MHz clock                                     JUMPED

  J1803 (single jumper in far left corner)
   Jump to enable VME slot-1 functionality                        JUMPED

  J2202 (single jumper in near right corner)
   Jump to enable 25MHz ESP-236 clock                             JUMPED

  J2602 (3-pin jumper in middle near edge, pin 1 nearest)
   1-2    mouse TD grounded                                       JUMPED
   2-3    mouse TD enabled

  J2603 (single jumper in nearish middle)
   Jump to enable 19MHz SCC clock                                 JUMPED

  J2803 (3-pin jumper in nearish middle, pin 1 nearest)
   1-2    RS-232 (-12V)                                           JUMPED
   2-3    RS-423

  J2804 (3-pin jumper in nearish middle, pin 1 nearest)
   1-2    RS-232 (+12V)                                           JUMPED
   2-3    RS-423

  J3201 (single jumper in middle)
   Jump to enable 80MHz clock                                     JUMPED

 Additional features of interest: the boot PROMs are in the near left corner at
  locations U3001, U3002, U3004, and U3003 (clockwise from far right).  The
  NVRAM chip is in the middle, at location U2701.  The serial ports A and B
  fuses (F2801/F2802) are along the near edge by serial port B.  The keyboard
  fuse F2601 is by the keyboard connector, the Ethernet fuse F2301 is by the
  Ethernet connector, and the SCSI fuse F2201 is by the SCSI connector.

 Note that boot PROM version 2.8v2 or later is required to use SM41 modules.
  Boot PROM version 2.10 or later is required to use SM51, SM520, or SM521

 Power requirements (with 0M and no Mbus modules) are +5V @ 14.27A.


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