SuperBasic Variables Area

Offset	Size	Mnemonic	Description
$00	Long	BV_BFBAS	Buffer Base
$04	Long	BV_BFP	Buffer running pointer - aka Top
$08	Long	BV_TKBAS	Token List
$0C	Long	BV_TKP	Token List Top
$10	Long	BV_PFBAS	Program File Base
$14	Long	BV_PFP	Program File Top
$18	Long	BV_NTBAS	Name Table Base
$1C	Long	BV_NTP	Name Table Top
$20	Long	BV_NLBAS	Name List Base
$24	Long	BV_NLP	Name List Top
$28	Long	BV_VVBAS	Variables Values Base
$2C	Long	BV_VVP	Variables Values Top
$30	Long	BV_CHBAS	Channel Table Base
$34	Long	BV_CHP	Channel Table Top
$38	Long	BV_RTBAS	Return Table Base
$3C	Long	BV_RTP	Return Table Top
$40	Long	BV_LNBAS	Line Number Table Base
$44	Long	BV_LNP	Line Number Table Top
$48	Long	BV_BTP	Backtrack Stack during parsing
$4C	Long	BV_BTBAS	Backtrack Stack Base
$50	Long	BV_TGP	Temporary Graph Stack during Parsing
$54	Long	BV_TGBAS	Temporary Graph Stack Base
$58	Long	BV_RIP	Maths Stack Top
$5C	Long	BV_RIBAS	Maths Stack Base
$60	Long	BV_SSP	System Stack Top
$64	Long	BV_SSBAS	System Stack Base
$68	Word	BV_LINUM	Current Line Number
$6A	Word	BV_LENGTH	Current Line Length
$6C	Byte	BV_STMNT	Current Statement on Line
$6D	Byte	BV_CONT	Continue ($80) or stop ($00) Processing
$6E	Byte	BV_INLIN	Processing in-line clause or not. Loop ($01), other ($FF) or off ($00)
$6F	Byte	BV_SING	Single line execution on ($ff) or off ($00)
$70	Word	BV_INDEX	Name table row of last in-line loop index used
$72	Long	BV_VVFREE	First free space in variables area
$76	Long	BV_SSSAV	Value of SP to go to when Out of Memory occurs
$7A	6 Bytes		Currently unused
$80	Long	BV_RAND	Randon number
$84	Long	BV_COMCH	Command Channel ID
$88	Word	BV_NXLIN	Line number to start after
$8A	Byte	BV_NXSTM	Statement to start after
$8B	Byte	BV_COMLN	Command line saved ($FF) or not ($00)
$8C	Word	BV_STOPN	Set stop number
$8E	Byte	BV_EDIT	Program has been edited ($FF) or not ($00)
$8F	Byte	BV_BRK	Break during I/O ($00) or not ($80)
$90	Byte	BV_UNRVL	Need to unravel ($FF) or not ($00)
$91	Byte	BV_CNSTM	Statement to CONTinue after
$92	Word	BV_CNLNO	Line number to CONTinue after
$94	Word	BV_DALNO	Current DATA line number
$96	Byte	BV_DASTM	Current DATA stamement number
$97	Byte	BV_DAITM	DATA item counter
$98	Word	BV_CNIND	In-line loop index to CONTinue with
$9A	Byte	BV_CNINL	In-line loop flag for CONTinue
$9B	Byte	BV_LSANY	Whether checking LIST ($FF) or not ($00)
$9C	Word	BV_LSBEF	Invisible top line number
$9E	Word	BV_LSBAS	Bottom line number in window
$A0	Word	BV_LSAFT	Invisible bottom line number
$A2	Word	BV_LENLN	Length of window line
$A4	Word	BV_MAXLN	Number of lines in window
$A6	Word	BV_TOTLN	Number of window lines so far
$A8	Word		Currently unused
$AA	Byte	BV_AUTO	AUTO or EDIT is on ($FF) or off ($00)
$AB	Byte	BV_PRINT	Print from PRTOK ($FF) or not ($00)
$AC	Word	BV_EDLIN	Next editable line number
$AE	Word	BV_EDINC	AUTO incerment number
$B0	Long	BV_TKPOS	Location of A4 in Token List when starting a PROCedure
$B4	Long	BV_PTEMP	Temporary pointer for GO_PROC
$B8	Byte	BV_UNDO	Undo return stack ($FF) or not ($00). Results in PROC/FN Cleared.
$B9	Byte	BV_ARROW	Arrow down ($FF) or up ($01) or neither ($00)
$BA	Word	BV_LSFIL	Where to fill window to, when relisting
$BC	Word	BV_WRLNO	WHEN ERRor line number. QDOS 1.10 onwards
$BE	Byte	BV_WRSTM	WHEN ERRor statement number. QDOS 1.10 onwards
$BF	Byte	BV_WRINL	WHEN ERRor in-line ($FF) or not ($000). QDOS 1.10 onwards
$C0	Word	BV_WHERR	Processing WHEN ERRor ($80) or not ($00). QDOS 1.10 onwards
$C2	Long	BV_ERROR	Last error code. QDOS 1.10 onwards
$C6	Word	BV_ERLIN	Last error line number. QDOS 1.10 onwards
$C8	Word	BV_WVNUM	Number of watched (WHEN) variables. QDOS 1.10 onwards
$CA	Long	BV_WVBAS	Base of WHEN variable table. QDOS 1.10 onwards
$CF-$9F	49 Bytes		Currently unused
$100		BV_END	End of Basic Variables