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  1.                                    CP/M Plus.. V3.0
  2.                            Patch 10, DIRLBL patch 01, 5/1/83
  3.  
  4.                          Copyright....1983 by Digital Research
  5.                  CP/M Plus and SID are trademarks of Digital Research.
  6.                                    Compiled July 1983
  7.  
  8.  
  9.           Note:  This file is extracted from the file called CPM+PAT.PAT that
  10.                  exists on some RCP/M systems.  This patch has an error in
  11.                  that file.  This is corrected and verified on the phone with
  12.                  DRI's technical support center.  30 Oct 84....dave mabry
  13.  
  14.  
  15.           Program:  DIRLBL.RSX
  16.           Products and Serial Numbers Affected:  CP/M Plus.. V3.0  2-000-00001
  17.           through 2-000-xxxxx
  18.  
  19.           Error Description:
  20.  
  21.           In some circumstances, DIRLBL destroys critical addresses at the end
  22.           of the file descriptor area.  It also does not allocate enough local
  23.           stack for some BIOS implementations.  Both situations  result  in  a
  24.           hung system.
  25.  
  26.           Patch Procedure:
  27.  
  28.           Make a back-up copy of DIRLBL.RSX before making  any  changes.   Use
  29.           SID.. to patch DIRLBL.RSX with the following series of commands:
  30.  
  31.                A>ren dirlbl.sav=drlbl.rsx
  32.                A>sid dirlbl.sav
  33.                CP/M 3 SID - Version 3.0
  34.                NEXT MSZE  PC  END
  35.                0700 0700 0100 D4FF
  36.                #s101
  37.                0101 1E 0
  38.                0102 04 5
  39.                0103 00 .
  40.                #s230
  41.                0230 1E 3E
  42.                0231 05 .
  43.                #a375
  44.                0375 call 053e
  45.                0378 .
  46.                #m61E,6FF,700
  47.                #f600,6FF,0
  48.                #a63e
  49.                063E mov e,m
  50.                063F inx h
  51.                0640 mov d,m
  52.                0641 xchg
  53.                0642 shld 04ad
  54.                0645 ret
  55.                0646 .
  56.                #f780,79f,0
  57.                #f7e0,7ff,1a
  58.                #s788
  59.                0788 00 8
  60.                0789 00 .
  61.                #wdirlbl.rsx,100,7ff
  62.                000Eh record(s) written.
  63.                #g0
  64.                A>gencom set.com
  65.  
  66.                GENCOM completed.
  67.  
  68.                A>gencom set.com dirlbl.rsx
  69.  
  70.                GENCOM completed.
  71.  
  72.                A>
  73.  
  74.  
  75.           Licensed users are granted the right to  include  these  changes  in
  76.           CP/M Plus V3.0 software.
  77.