The extensions are as follows, in approximately the order I'm tackling them:

Commands
$$<num>=<str>	DONE:	null-terminated string indirection
PROC(<num>)[(parameter list)]	DONE:	Call a procedure indirectly
WAIT <num>	DONE:	Wait for centisecond delay
\	DONE:	Skip to next line
PLOT <num>,<num>	DONE:	Do PLOT 69,<num>,<num>
EXIT WHILE	DONE:	Exit current WHILE loop
EXIT REPEAT	DONE:	Exit current REPEAT loop
EXIT FOR	DONE:	Exit current FOR loop
EXIT FOR <var>		Exit specified FOR loop
PROCname(PROCname|FNname)		Pass a procedure/function to a procedure
PRIVATE var[,var...]		Declare variables private to function or procedure
DIM struct{<members>}		Define a structure
DIM struct{}=struct{}		Define with a prototype
PRIVATE struct[,struct...]		Declare structures private to function or procedure
name.name=		Assign structure member
RECTANGLE SWAP <num>,<num>,<num>[,<num>] TO <num>,<num>
Functions
$$<num>	DONE:	null-terminated string indirection
^<identifier>	DONE:	Address of identifier
FN(<num>)[(parameter list)]	DONE:	Call a function indirectly
FNname(PROCname|FNname)		Pass a procedure/function to a procedure
DIM(struct{})		Return size of structure
name.name		Read structure member value
GET$(<num>,<num>)		Read a character from the specified character position
GET(<num>,<num>)		Read a character from the specified character position
The following are from PDP11 BASIC, I may or may not add these:
STR$/<num>		Return string representation in binary
STR$=<num>		Return string representation in octal
&o		Octal number
GET(<num>)		Read a value from the specified I/O port
address|offset		Real diadic indirection
Compound Operators
AND=	DONE:	Bitwise AND
DIV=	DONE:	Integer division
EOR=	DONE:	Bitwise exclusive-OR
MOD=	DONE:	Modulus
OR=	DONE:	Bitwise OR
*=		Multiplication
/=		Division
Array Operations
array() = array() [AND|DIV|EOR|MOD|OR] array()
array() [AND|DIV|EOR|MOD|OR]= <expr>

Changes to ARM BBC BASIC source code
====================================
15-Feb-2009:
- EXIT WHILE|REPEAT|FOR working, EXIT FOR <var> not yet done.

12-Feb-2009:
- PLOY x,y does same as PLOT 69,x,y to plot single point
- EXIT WHILE working, trying to generalise code to allow EXIT REPEAT|FOR
  to use same code.

09-Feb-2009:
- Line continuation fully working

06-Feb-2009:
- Syntax checked for EXIT [FOR|REPEAT|WHILE]
- Line continuation character working for expressions
  Not fully working on PROC calls with arrays

01-Feb-2009:
- ^PROCname() and ^FNname() enforced, to match BBFW syntax
- WAIT<cr> bug fixed, WAIT 0 same as WAIT with no parameter

29-Jan-2009:
- FN/PROC lookup working as subroutine, ^PROCname and ^FNname works
  Indirect PROC(<num>) and FN(<num>) also works, allows, eg:
  DIM pr%(3):pr%()=^PROCone, ^PROCtwo, ^PROCthree, ^PROCfour
  PROC(pr%(GET AND 3))
- WAIT <num> waits <num> ticks

26-Jan-2009:
- AND=, OR=, EOR=, MOD=, DIV= done.

24-Jan-2009:
- FN/PROC lookup now a subroutine so ^ can call it.
  Causing stack corruption, so changes commented out.
- $$<address>=<str> - store nul-terminated string.
- <str>=$$<address> - fetch nul-terminated string.

18-Jan-2009:
- Added ^ (address-of) function, <num>=^<var>.
  Returns the address of the data block of <var>.
  Eg, fred%=6:PRINT !^fred% displays 6.
      jim$="hi":PRINT ~!^fred% displays address of start of "hi" string.
  Doesn't yet do ^PROCname and ^FNname.

13-Jan-2009:
- Get source code assembleable:
  Ensure all LNK commands are of the form LNK s.filename, not LNK filename.s
  LookUpHelp turned off, OwnErrors turned on, my machine doesn't have enough
    BasicTrans messages
  Change startup banner to VeRsIoN to be quickly identifyable

- Add tokens for PRIVATE, EXIT.
  Added dispatch address in command and function dispatch tables.
  Added tokens to tokeniser/detokeniser.
  Wrote stub code.
  NB: BASICTrans 1.00 falls over with extra tokens, must RmKill BASICTrans
    before running

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Authored by J.G.Harston - Last update: 26-Nov-2012