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Note 3.0                      LSI-11/73 Bootstraps                    No replies
JAWS::KAISER                                        114 lines  25-MAR-1985 09:14
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      +---------------+					   +-----------------+
      | d i g i t a l |					   |  uNOTE # 003    |
      +---------------+					   +-----------------+


      +----------------------------------------------------+-----------------+
      | Title: Compatible Bootstraps for the LSI-11/73	   | Date: 28-NOV-83 |
      +----------------------------------------------------+-----------------+
      | Originator: Mike Collins			   | Page 1 of 2     |
      +----------------------------------------------------+-----------------+



      The LSI-11/73 (KDJ11-AA) is a high performance CPU for the Q-Bus.	 It is
      a	 CPU  only, which means that there is no boot capability on the module
      itself.  Therefore a boot module must  be	 selected  to  work  with  the
      LSI-11/73.

      This uNOTE will discuss the bootstrap modules which can be used with the
      11/73.

      There are 4 possible modules which can be used for bootstrap.
      They are : MXV11-BF w/MXV11-B2 boot ROMs
		 MRV11-D  w/MXV11-B2 boot ROMs
		 MXV11-AA or -AC w/MXV11-A2 boot ROMs
		 BDV11

      For an LSI-11/73 based system to be Field Serviceable the bootstrap code
      must  execute a cache memory diagnostic on power-up.  The only boot code
      which satisfies this requirement is found in  the	 MXV11-B2  boot	 ROMs.
      Therefore	 an  LSI-11/73 based, Field Serviceable system must use either
      the MXV11-BF w/MXV11-B2 ROMs or the MRV11-D w/MXV11-B2 ROMs.

					NOTE

	      The MXV11-B2 ROMs will not work on the MXV11-A module.

      MXV11-BF or MRV11-D w/MXV11-B2 ROMs
      -----------------------------------

      The MXV11-BF w/MXV11-B2 ROMs is the preferred choice since  this	module
      has  2  asynchronous  serial  lines  as  well as 128Kb of dynamic RAM in
      addition to the boot capability.	However, if your application does  not
      need  the	 extra	serial lines and RAM, an alternate choice would be the
      MRV11-D w/MXV11-B2 ROMs.

      The MXV11-B2 ROMs will boot the following devices :
		  RLO1 / RLO2 (DL)
		  RXO1 / RXO2 (DX,DY)
		  TU58 (DD)
		  TSV05 (MS)
		  MSCP type Devices e.g. RD51, RX50 (DU)
		  DECnet via DPV11, DLV11-E, DLV11-F, DUV11

								Page 2


					NOTE

	      The MXV11-BF  is	not  supported	by  RSTS  due  to  its
	      non-parity  memory.   An alternative configuration would
	      be to use the MRV11-D with the MXV11-B2 boot ROMs, and a
	      DLV11-J or other DLV11 serial line device.

      The remaining 2 boot modules do NOT  have	 the  necessary	 cache	memory
      diagnostic code to make an 11/73 based system Field Serviceable.

      Below is a list of all  of  the  KNOWN  WORKING  bootstraps  for	the  2
      remaining boot modules.

      MXV11-A w/MXV11-A2 ROMs
      -----------------------

      Working bootstraps : RLO1 / RLO2
			   RXO1 / RXO2
			   TU58 conventional boot
			   TU58 standalone boot

				      WARNING

	      If the MXV11-A is used in a 22 bit system	 the  on-board
	      RAM must be disabled.  Refer to uNOTE  106.

      BDV11
      -----

      Working bootstraps : RLO1 / RLO2
			   RXO2
			   RK05

				      WARNING

	      Disable the processor and	 memory	 tests	since  an  odd
	      address  trap  does  occur  in  each  of them.  See NOTE
	      below.  To disable the CPU test,	set  switch  E15-1  to
	      OFF.   To	 disable  the memory test, set switch E15-2 to
	      OFF.   (Refer  to	 the  Microcomputer   and   Interfaces
	      Handbook for complete configuration information.)

	      The 11/73 has an	on-board  Line	Time  Clock  Register,
	      therefore	 the BDV11 BEVNT switch E21-5 should be set to
	      the OPEN position.  This disables	 software  control  of
	      the  BEVNT  signal via the BDV11 LTC register and allows
	      software control	of  this  signal  via  the  11/73  LTC
	      register.

	      If the BDV11 is used in a 22 bit system, it must	be  CS
	      REV E or later or ECO M8012-ML0005 must be installed.


					NOTE

	      ODD ADDRESS TRAPS.  The 11/23  ignores  an  odd  address
	      reference whereas the KDJ11-A will trap to address 4.

