MANUAL FOR LISTFIX (6502 Machine code)

This file describes the program LISTFIX which cures a bug in BASICs of version 
less than 4.Typing in a program with loops and using the LISTO7 option (ie.
indent all loops and indent line numbers by one too) will no format text 
properly - the closing NEXT (or UNTIL) statement is left too far out.
The manual and software is (C)1997 SPROW

INSTRUCTIONS-
At any command line prompt,eg.the BASIC command prompt '>' type *LISTFIX

The program will then install itself into page &C00 (the CHR$ defn buffer on 
the BBC and Electron,or Econet workspace on the Master) where it will check 
the character stream for the letter N or the letter U in Next and Until 
respectively.Pressing BREAK will stop the program intercepting letters.
The program lays dormant in memory unless the most recent OSWord 0 (get line) 
started with "L".
Note that due to space restrictions,the VDU stream is not fully tested - ie.
embedding obscure VDU sequences in your listing may cause unpredictable 
results.

EXIT MESSAGES-
"Not in BASIC" - the current language must be BASIC for the patch to work
"Wrong BASIC version" - the patch only works with BASIC I/II/III

KNOWN PROBLEMS/FUTURE ENHANCEMENTS-
No known problems
Repointing of the 'reset' vector,to allow the pressing of BREAK,as for example
may be performed when pressing BREAK-SHIFT to boot a disk.

HISTORY-
V1.00 First release version,to 8 Bit Software disk user group.
V1.10 Uses &37 to read most recent token rather than scanning along one next 
      line ahead of BASIC
V1.20 Resulting space saving from V1.10 now used to test for BASIC version <=3
V1.30 Changed error message text,updated docs,checked with BASIC III and 
      optimised an instruction