BBC BASIC LISTO options
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LISTO
  1 Display space after line number
  2 Indent FOR/NEXT loops, indent loops
  4 Indent REPEAT/UNTIL loops, split lines at ':'
  8 Line numbers not displayed
 16 Keywords listed in lower case
 32 Pause listing at end of each screen
 64
128

Bit 0 Display space after line number
  If no spaces are displayed, then spaces are also stripped on entry on
  BASIC IV and later.

Bit 1 Indent loops
  Indents FOR/NEXT loops on BASIC with only REPEAT/UNTIL, indents all loops
  and structures (FOR/REPEAT/WHILE/CASE/ENDIF) on other BASICs.

Bit 2 Indent REPEAT/UNTIL loops, split at ':'
  Indents REPEAT/UNTIL loops on BASIC with only REPEAT/UNTIL, splits lines
  on other BASICs.

Bit 3 Line number not displayed
  Implemented in ARM BASIC

Bit 4 Keywords listed in lower case
  Implemented in ARM BASIC

Bit 5 Pause listing
  Implemented in Brandy Basic