LLF Version 1.1
                            11/27/86

     LLF  Version 1.1 corrects a bug in Version 1.0  that  caused 
sporadic  and unpredictable bomb-outs. The bug manifested  itself 
with  a  'TPA  Overflow' error-message, for which  nobody  had  a 
sensible  explanation. Bruce Morgen finally tracked the bug  down 
during his recent exhaustive work with library files. 

     The bug results from an error in the LUDIR module of  SYSLIB 
Version  3.6.  The  source  of the bug was  traced  to  the  file 
SLUDIR.Z80.  The line in SLUDIR.Z80,'ld a,(bdose+7)',  should  be 
'ld a,(bdose+2)'.

     The LUDIR module of SYSLIB, used in LLF, derives the top  of 
TPA  from  the  most significant byte (msb)  of  the  bdos  entry 
address, which is contained at memory address 7. Since 'bdose' is 
equated to 5, the most significant byte of the bdos entry address 
is  at 'bdose+2', not 'bdose+7'. By loading 'bdose+7' into the  A 
register,  the LUDIR module introduces a random number  into  the 
top-of-TPA calculation. Neither CP/M nor ZCPR3 documentation sets 
forth  a  value  for 'bdose+7' and at any  particular  time  this 
address may contain any of 255 different values.

     The source code for LLF has not been released. Nevertheless, 
examination of the program with a debugger reveals the  erroneous 
code at 069DH. That byte should be changed from 0C to 07.  That's 
all there is to it.

     For  those  unaccustomed to in-memory  modification  of  COM 
files, we have included a patched version of LLF in this library, 
LLF Version 1.1.

     In  addition, we have included the modified source code  for 
the LUDIR module, SLUDIR11.Z80.

Bug Fix:

     Bruce Morgen
     Director, NAOG/ZSIG

Documentation:

     Richard Jacobson
     Sysop, Lillipute Z-Node
     312-649-1730 System 1
     312-664-1730 System 2