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• Specifications

4/20 (SPARCstation SLC) motherboard

 20MHz MB86901A or LSI L64801.

 This board is an unusual shape because it is intended to slip into the
  vertical slot in the monitor case behind the tube.  It slides in from the
  top, I believe with the component side facing toward the front of the machine
  (all left/right orientations below assume you are looking down on the board
  from the rear of the machine).  There are six diagnostic LEDs on the top edge
  (bit 0 away from the SIMMs, to the right).  On the bottom edge is an edge
  connector which supplies power and connects the CPU to the external signal
  connectors.

 There are no jumpers.

 Memory consists of up to four 4M x 33 72-pin SIMMs (501-1676 or 501-1698) in
  SIMM slots U0502, U0602, U0501, and U0601 in that order.

 Additional features of interest: the boot PROM is along the upper edge, toward
  the right, at location U1001.  The NVRAM is to the left of the boot PROM at
  location U1011.  SCSI fuse F0901 and Ethernet fuse F1101 are toward the right
  bottom, near the edge connector, and are both non-replaceable PTC devices.

 Note that the SLC was first supported in SunOS 4.0.3c.  Additionally, CPU
  boards with the 53C90A SCSI controller require a patch to operate under
  4.0.3c.

  

   Last modified: 2000.12.07.21.38.14 CST
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