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- :
- BGii HISTORY and ERROR line editor controls
-
- back fwd delete delete delete
- left right all
-
- Char ^S ^D BS,DEL ^G
-
- Word ^A ^F ^W ^T
-
- Cmd ^Q ^R ^Z
-
- Line ^E ^X ^Y ^U
-
- toggle:
- ESC: command history recording (single token commands skipped)
- ^B: recall of Both tasks' commands
- ^V: insert/oVerwrite mode
-
- ^L: Look (search) backward for matching partial command
- ^J: this help (LINEFEED)
-
-
-
- Prompt is:
- = uppercase DU if upper-task, lower if lower task
- /
- [!+^] hr:mi Duu>
- / | \
- | | = ^ if INSERT active
- | |
- | = + if upper-task, - if lower-task and recall BOTH active
- |
- = ! if LOG active
-
- TIME ON/OFF controls hr:mi display in prompt.
-
-
-
- CP command
-
- CP [DU:|DIR:]destination=[DU:|DIR:]source (CP/M form)
-
- or, CP [DU:|DIR:]source [DU:|DIR:]destination (MS-DOS form)
-
- unambiguous name only.
-
- If DateStamper is active, destination file's DateStamp = source's DateStamp.
-
-
- REGister command
-
- REG D or REG <-- Display Register Value
-
- REG Mreg <-- Decrement Register Value
- REG -reg
-
- REG Preg <-- Increment Register Value
- REG +reg
-
- REG Sreg value <-- Set Register Value
-
- where: reg = 0 ... 9
- value = 0 ... 255
-
-
- These are technical DOC-notes: April 13, 1987
-
- They are provided in hopes that someone will be inspired to write
- an editor to manipulate the history file!
-
- BGHIST.VAR is in user 0 on swap drive.
-
- BGHIST [n] invokes BGHIST as the history shell for currently-active
- task.
- n = size of swap file x 2K, default is n=1.
-
- On first task switch, run BGHIST again to install as alternate-task
- shell.
-
-
- BGERRH invokes the error-handler. It has the same editing controls
- as BGHIST.
-
-
- Data Structure for BGHIST.VAR
-
- Sector 0:
- recorq: ds 1 ;NZ if record-line flag is on
- insert: ds 1 ;NZ if insert-mode is on
- skipq: ds 1 ;NZ if search/dispay only current task
- ;i.e. Both is false
- maxrec: ds 1 ;max. record number for VAR file size
- newptr: ds 2 ;ptr to <record> for next command line
- topptr: ds 2 ;ptr to last-recorded history
- ...
- ds 2
- ;
- Sector 1...maxrec
- command-line 1,NUL, command-line 2, NUL, ...
-
- The first byte of the command line has bit 7 set if the command
- was entered in the LOWER task.
-
- Each recorded command line has a 2-byte <record> pointer:
-
- ds 1 ;offset (0...7Fh)
- ds 1 ;file record number (1...maxrec)
-
- The pointer list is terminated by a NUL record number.
- E.g.:
-
- newptr: dw 0248 ;record 2, offset 48 will begin next line
- topptr: dw 0204 ;most recently recorded command at rec2,off 4
- dw 0170
- dw 0112
- dw 0100 ;first line at rec. 1, offset 0
- dw 00xx ;no more
-
- Note that the pointers will wrap around when/if the file fills up,
- beginning again with record 1 (not 0, which holds the pointers).
-
-
- dd