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! d i g i t a l !   I N T E R O F F I C E  M E M O R A N D U M
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				       Date: 19-February-82
				       From: TSG/NCSS
				       Loc:  MR1-2/H22
				       Ext:  HOTLINE  5911
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Subj:	CHK11
.subtitle Subj:	CHK11
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A new and useful feature has been added to RSX20F.  At system
startup you may optionally run CHK11.   CHK11 is a module which makes some 
preliminary hardware checks on the PDP11 Console Front End.
The CHK11 which has been added to RSX20F is a variant of the
CHK11 which runs on all other TOPS communication front ends and
works in much the same way.  When booting the system from the switch
register CHK11 will run if the switches in the register are set up
properly.  If switch 0 is on and switches 1 and 2 are off CHK11 will
run before KLI begins to initalize the system.  Switches 3 through 15 may be set as desired to control other boot options.  CHK11 is designed to
look for and report certain UNIBUS devices.  When it runs it will attempt
to address and test the devices that are normally connected to the
RSX20F Console Front End.  CHK11 will print a list of the devices
it finds and if any of the hardware tests fail will also print some
error information describing the device and error found on the CTY.
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CHK11 is contained in the SAVE utility and is overwritten when
KLI is run.  It cannot be run again unless the system is rebooted from
the switches.  If the system were booted from the switch register
with bit 0 set and bits 1 and 2 cleared the output on the CTY might
look like the following example depending on what devices were connected
to the UNIBUS.
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Initializing RSX-20F
   160000 bytes of memory
     MF11-UP
     KW11-L
   1 DL11-C CTY
   1 DL11-E KLINIK
   2 DL11-E's
   1 CD11
   1 RX11
   1 RH11
   1 DTE20


%  DTE20 #0(Adr = 174400)

       DTE20 is not restricted

   4 DH11's
   4 DH11-BB's
   1 LP20

RSX-20F VB14-45 13:40 12-Nov-81

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and the normal typeout which RSX-20F has always printed would
continue here ie. the KLI typeout etc.


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Any error reports will be preceded by a % warning.
The device in error, its address and a brief description of the
problem will follow.  If a device cannot be accessed by the software
nothing will be printed on the CTY about it.  This means that 
the absence of a device in the CTY printout is also an error.  If the
device was reported previously and is still connected physically but
not currently seen by the software it is probably not functioning at all.
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The % warning for the non restricted DTE20 in the example above
is normal and merely reminds you that the DTE20 for the Console
Front End always runs in privileged mode.
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If the system has several of the same type of devices arranged
one after the other on the UNIBUS and the unit numbers are not
consecutive CHK11 will report these "holes" in the addressing
as missing devices.  For example if there were eight DH11s in the
system and the software could only access units 0,1,2,and 6,7 then
units 3,4,and 5, would be reported as missing.  This might occur
if the addresses were set up wrong in the hardware or more frequently
if the missing units were not functioning properly.
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The RH11 is merely addressed so that it may be reported to be
present.  No testing is done on the device to avoid the possibility
of overwriting data on the disk should the hardware be broken.
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More information on the options available when booting from the
switch register are documented in the TOPS RSX20F SYSTEM REFERENCE
MANUAL.