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MAGGIE.MAC
PSEUDO RANDOM-ACCESS FOR MAGTAPES
JOHN L. MOSS
FELDBERG COMPUTER CENTER, BRANDEIS UNIVERSITY
JANUARY, 1976
NOTE
THIS DOCUMENTATION DESCRIBES
SOFTWARE AS OF V 1A(1) OF
MAGGIE AND DOES NOT REPRESENT
A COMMITMENT FOR SUPPORT ON
BEHALF OF THE FELDBERG
COMPUTER CENTER.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 2
GENERAL PHILOSOPHY
1.0 GENERAL PHILOSOPHY
MAGGIE IS DESIGNED TO GIVE USERS WITH MEDIUM SIZED DATA
BASE SYSTEMS THE FLEXIBILITY OF DECTAPES ON A LARGER SCALE.
USERS WHO DO NOT USE PRIVATE FILE STRUCTURES EITHER BECAUSE
OF EXCESSIVE COST (CURRENTLY AROUND $350) OR INFREQUENCY OF
USE MAY FIND IT HELPFUL TO KEEP FILES ON MAGNETIC TAPE.
MAGGIE ALLOWS A USER TO REFERENCE FILES BY NAME ON MAGNETIC
TAPE.
SAFEGUARDS HAVE BEEN IMPLIMENTED IN MAGGIE TO ALLOW
RECOVERY OF LOST OR MISTAKENLY DELETED FILES. THE FOLLOWING
SECTIONS DEAL WITH THE COMMANDS FOR MAGGIE AND THE MODE OF
STORAGE.
1.1 TAPE STRUCTURE
A TAPE FORMATTED FOR MAGGIE IS ARRANGED AS FOLLOWS:
-------------------------
I I
I DIRECTORY BLOCK I
I I
I.......................I
I I
I HEADER FILE NUMBER 1 I
I I
I.......................I
I ACTUAL FILE NUMBER 1 I
I I
I.......................I
I I
I (ETC) I
-------------------------
WHERE THE DIRECTORY FILE IS THE FIRST FILE ON THE TAPE, AND
EACH HEADER FILE CONTAINS THE DIRECTORY ENTRY FOR THE FILE
WHICH FOLLOWS IT. THE ENTIRE TAPE, INCLUDING HEADER FILES
AND DIRECTORY BLOCK, IT RECORDED IN IMAGE BINARY MODE.
1.1.1 STRUCTURE OF DIRECTORY BLOCK -
WHENEVER A COMMAND TO COPY TO TAPE IS GIVEN, THE
FOUR-WORD LOOKUP BLOCK IS SAVED. AFTER THE FILE HAS BEEN
SUCESSFULLY WRITTEN ONTO TAPE, THE BLOCK IN ITS ENTIRETY IS
TRANSFERED TO THE DIRECTORY AREA IN CORE AND THUS ENTERED
INTO THE TAPE DIRECTORY. SINCE THE DIRECTORY IS WRITTEN
ONTO THE TAPE ONLY ON COMMAND TO DO SO (/E OR /W COMMANDS),
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 3
GENERAL PHILOSOPHY
THE /S COMMAND HAS BEEN ADDED TO ALLOW THE USER TO DETERMINE
THE STATUS OF HIS DIRECTORY IN CORE. THE DIRECTORY IS
WRITTEN ONTO THE TAPE ONLY IF IT HAS BEEN UPDATED IN SOME
WAY (COPY TO TAPE, OR DELETE). THIS ALLOWS THE USER TO HAVE
THE TAPE WRITE-PROTECTED. THE FOLLOWING IS AN OUTLINE OF
THE FOUR WORD DIRECTORY ENTRY:
-------------------------
ISIXBIT/FILENAME/ I
I.......................I
ISIXBIT/EXT/,,HD2,DATE 1I
I.......................I
IPROT/MODE/TIME/LD2 I
I.......................I
ISIZE IN WORDS OR BLKS I
-------------------------
HD2= HIGH CREATION DATE (3 BITS)
LD2= LOW CREATION DATE (12 BITS)
MAGGIE ADDS A FIFTH WORD TO THIS BLOCK AS SHOWN BELOW.
-------------------------
I (UNUSED),,POSITION I
-------------------------
WHERE POSITION IS THE PHYSICAL POSITION ON THE TAPE OF THE
HEADER FILE/FILE COMBINATION. THE DIRECTORY BLOCK THUS
CONTAINS A SERIES OF FIVE-WORD ENTRIES FOR FILES ON THE
TAPE. A DELETE COMMAND, FOR EXAMPLE, ACTS SIMPLY BY PLACING
A ZERO IN THE FIRST WORD OF THE ENTRY TO BE DELETED.
IN ADDITION TO THE FILE ENTRIES, THE DIRECTORY BLOCK
CONTAINS TWO WORDS OF IDENTIFICATION IN POSITIONS 0 AND 1.
WORD 0 OF THE DIRECTORY BLOCK CONTAINS THE POSITION OF THE
LAST FILE HEADER/FILE PAIR, AND WORD 1 CONTAINS A SIXBIT
TAPE ID.
1.2 FUNCTIONING OF THE COMMANDS
THE PROGRAM ACTIONS FOR EACH TAPE MANIPULATION COMMAND
ARE DESCRIBED IN WHAT FOLLOWS.
1.2.1 COPY TO TAPE -
THE PROGRAM SCANS THE USER'S ENTIRE UFD FOR THE
SPECIFIED DISK DEVICE FOR EACH FILESPEC. IF A MATCH IF
FOUND, THE TAPE IS POSITIONED AT THE END OF THE LAST FILE
AND THE NEW HEADER FILE AND FILE ARE WRITTEN. TAPE IS NOT
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 4
GENERAL PHILOSOPHY
REWOUND.
1.2.2 COPY TO DISK -
THE DIRECTORY IS READ INTO CORE (UNLESS IT HAS
PREVIOUSLY BEEN) AND THE CORE DIRECTORY IS SCANNED FOR EACH
FILESPEC. THE MATCH FILES ARE THEN SORTED IN ORDER OF
POSITION ON TAPE, AND DOUBLE ENTRIES REMOVED. THE TAPE THEN
MOVES FORWARD AND COPIES THE INDICATED FILES TO DISK. THIS
PROCEDURE CAUSES THE FOLLOWING RESTRICTIONS TO BE IMPOSED:
1. ALL FILES MUST GO TO THE SAME STRUCTURE
2. TOO MANY DUPLICATE ENTRIES CANNOT BE PROCESSED
THIS MEANS THAT MTA:*.*,MTA:*.* CANNOT BE PROCESSED SINCE
MAGGIE DOES NOT HAVE SUFFICIENT CORE TO SORT THIS LIST. IN
THE DISTRIBUTION VERSION, 500 FILES ARE ALLOWED PER TAPE
(500 ACTIVE FILES) AND 700 FILES MAXIMUM MAY BE SPECIFIED IN
ANY ONE COPY TO DISK COMMAND.
1.2.3 DELETE FROM TAPE -
THE DIRECTORY IS READ INTO CORE (IF NOT ALREADY THERE)
AND THE FILE ENTRIES MATCHING THE FILE SPECS ARE DELETED BY
ZEROING THE FIRST WORD OF THAT FILE'S FIVE-WORD BLOCK.
FILES ARE LISTED AS THEY ARE DELETED.
1.2.4 FORMAT TAPE COMMAND -
THE TAPE IS REWOUND. A FULL DIRECTORY BLOCK OF ZEROS
IS WRITTEN AND THEN SIX INCHES OF BLANK TAPE. THE TAPE IS
ONCE AGAIN REWOUND.
1.2.5 TAG COMMAND -
THE TAPE DIRECTORY IS READ INTO CORE AND THE TAPE LABEL
WRITTEN INTO THE SECOND WORD OF THE CORE DIRECTORY.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 5
GENERAL PHILOSOPHY
1.2.6 REWIND TAPE COMMAND -
THE TAPE IS REWOUND AND THE DIRECTORY IS WRITTEN BACK
ON IF IT HAS BEEN CHANGED SINCE RUNNING THE PROGRAM. TAPE
IS LEFT AT LOAD-POINT.
1.2.7 EXIT COMMAND -
IF THE CORE DIRECTORY HAS BEEN CHANGED SINCE THE
PROGRAM WAS RUN, A W COMMAND IS PREFORMED. OTHERWISE, THE
PROGRAM EXITS.
1.2.8 "RECONSTRUCT" DIRECTORY COMMAND -
THE TAPE IS REWOUND, AND ALL HEADER FILES ARE READ INTO
THE CORE DIRECTORY. FILES WHICH ARE SUPERSEEDED ARE ALSO
SUPERSEEDED IN THE CORE DIRECTORY. FILE WHICH HAVE BEEN
DELETED BUT NOT SUPERSEEDED ARE RE-ENTERED INTO THE TAPE
DIRECTORY. IF A LARGE AMOUNT OF DELETING HAS BEEN DONE, THE
USER MAY OVERFLOW THE DIRECTORY SPACE, AND GET A "DIRECTORY
FULL" ERROR. THE CORE DIRECTORY MAY THEN BE WRITTEN ONTO
TAPE WITH THE REWIND OR EXIT COMMANDS.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 6
INTRODUCTION
2.0 INTRODUCTION
MAGGIE ALLOWS A USER TO USE A MAGTAPE IN A MANNER MUCH
LIKE A DECTAPE. FILES ARE CALLED BY NAME FROM THE TAPE'S
DIRECTORY IN A MANNER MUCH LIKE PIP. THE USER CAN DELETE
FILES, ADD NEW FILES, ZERO THE DIRECTORY, AND COPY FILES TO
DISK OR DECTAPE. IN ADDITION DIRECTORY LISTING AND GARBAGE
COLLECTING FROM THE TAPE ARE SUPPORTED. THESE WILL BE
EXPLAINED IN DETAIL IN WHAT FOLLOWS.
2.1 COMMAND FORMAT
TO ENGAGE MAGGIE, THE USER TYPES:
.R MAGGIE
-
AND MAGGIE RESPONDS:
*
WHICH IS A PROMPT FOR USER INSTRUCTION. A COMMAND MAY THEN
BE GIVEN AS A DIRECT COMMAND OR A COMMAND STRING. THE
DIRECT COMMANDS ARE:
/E TO EXIT TO MONITOR LEVEL
/H TO TYPE A SHORT HELP-TEXT
/S TO GIVE THE STATUS OF THE DIRECTORY IN CORE.
COMMAND STRINGS TAKE THE FORM:
<DEV>:/<SWITCH>_<FILE SPECS>
WHERE <FILESPECS> TAKE THE FORM:
<DEV>:<FILE>.<EXT>,<DEV>:<FILE>.<EXT>,...
THE SWITCHES ALLOWED WITHIN A COMMAND STRING ARE:
/D DELETE FILES
/F FORMAT THE TAPE (ZERO THE DIRECTORY)
/L LIST THE TAPE DIRECTORY
/M GIVE HARDWARE STATUS OF A PARTICULAT DRIVE
/Q FAST FORM OF /L LISTING FILENAMES ONLY
/R RECONSTRUCTS A DIRECTORY FROM HEADER-FILES
/T LABELS A TAPE
/W REWINDS THE TAPE AND WRITES THE DIRECTORY ON
/X COPIES FILES
THE COMMANDS "R" AND "F" USE THE FOLOWING FORMAT:
*MTA:/R_
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 7
INTRODUCTION
*MTA:/F_
WHERE THE RIGHT HAND SIDE IS IGNORED SINCE IT IS NOT NEEDED.
NOTE THAT THE CHARACTERS "=" AND "_" ARE INTERCHANGIBLE WITH
MAGGIE.
2.1.1 DELETE COMMAND -
THIS COMMANDS DELETES A FILE ENTRY FROM THE
IN-CORE-DIRECTORY (NOT FROM THE TAPE) AND RETURNS TO COMMAND
LEVEL. THE PHYSICAL TAPE IS NEVER ALTERED BY A DELETE
COMMAND. AFTER A DELETE COMMAND, THE DIRECTORY MUST BE
WRITTEN BACK ON THE TAPE TO MAKE IT EFFECTIVE (SEE /E AND
/W). FOR EXAMPLE:
*MTA0:/D_FOO.*,*.BAK,*.AB?
WILL DELETE ALL FILES NAMED FOO REGARDLESS OF EXTENSION, ALL
FILES WITH EXTENSION OF ".BAK" REGARDLESS OF FILE NAME, AND
ALL FILES WHICH HAVE "A" AND "B" TOGETHER IN THE EXTENSION
REGARDLESS OF THE THIRD CHARACTER. NOTE THAT THE SEQUENCE:
*MTA:/D_FOOBAR
WILL DELETE ALL FILES WHICH HAVE A NULL EXTENSION.
2.1.2 FORMAT TAPE COMMAND -
THE /F COMMAND ZEROS THE TAPES DIRECTORY BLOCK (IF ANY)
AND WRITES A NEW DIRECTORY OF ALL ZEROS FOLLOWED BY SIX
INCHES OF BLANK TAPE TO ALLOW FOR SPACING OPERATIONS WHICH
MAY VARY FROM DRIVE TO DRIVE. IN SUCESSIVE
DIRECTORY-WRITES, ONLY 3 INCHES OF BLANK TAPE WILL BE
WRITTEN, AND NO EOF (SEE /W AND /E). THE /F COMMAND DOES
NOT ALTER THE IN-CORE-DIRECTORY.
2.1.3 LIST DIRECTORY COMMAND -
THE /L COMMAND LISTS IN ALPHEBETIZED ORDER, THE FILES
CORRESPONDING TO THE GIVEN FILE SPECS. THE TAPE I.D.
TOGETHER WITH DATE, MODE, PROTECTION, SIZE, AND ACTUAL
POSITION ON TAPE ARE LISTED. THE SHORTER FORM OF THIS
COMMAND, /Q, LISTS ONLY TAPE ID AND FILENAMES. FOR EXAMPLE:
*TTY:/LMTA:*.*
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 8
INTRODUCTION
WILL LIST THE DIRECTORY OF THE ENTIRE TAPE ON THE TTY. THE
COMMAND:
*LPT:/LMTA:*.FOO
WILL LIST ALL FILES WITH EXTENSION FOO ON THE LINE-PRINTER.
VALID LISTING DEVICES ARE DISK, DECTAPE, LINE-PRINTER, AND
TERMINAL. MAGNETIC TAPE IS NOT A VALID LISTING DEVICE.
WHERE AN ENTER UUO IS MANDATORY FOR FILES (DISK, DECTAPE,
SPOOLED LPT), THE DIRECTORY FILE WILL BE CALLED <ID>.DIR
WHERE <ID> IS THE TAPE ID. IF NO TAPE ID HAS BEEN GIVEN (BY
A /T COMMAND) THE NAME "MAGTAP.DIR" IS ASSUMED.
2.1.4 HARDWARE STATUS COMMAND (/M) -
THIS COMMAND PRODUCES A DESCRIPTION OF HARDWARE DEVICE
ERRORS, NUMBER OF WORDS READ AND WRITTEN, THE TAPE'S REELID,
AND PHYSICAL TAPE POSITION. LISTING IS TO THE TERMINAL.
THIS SEQUENCE:
*MTA1:/M
WOULD LIST THE STATUS OF MTA DRIVE 1. LOGICAL DEVICE NAMES
MAY ALSO BE USED. THE USER IS PERMITTED TO SPECIFY A DEVICE
WHICH HE DOES NOT PRESENTLY OWN.
2.1.5 RECONSTRUCT DIRECTORY COMMAND (/R) -
THIS COMMAND ALLOWS A USER TO "RECONSTRUCT" A DEAD
DIRECTORY FROM THE FILE HEADERS ON TAPE. MAGGIE USES THE
FOLLOWING STRUCTURE FOR TAPE STORAGE:
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 9
INTRODUCTION
-------------------------
I I
I DIRECTORY BLOCK I
I I
I.......................I
I I
I HEADER FILE # 1 I
I I
I.......................I
I I
I ACTUAL FILE 1 I
I I
I.......................I
I I
I HEADER FILE #2 I
I I
I.......................I
I I
(ETC)
A HEADER FILE IS A FIVE-WORD FILE ASSOCIATED WITH EVERY
ACTUAL FILE ON THE TAPE. THE HEADER FILE CONTAINS A
DIRECTORY ENTRY IN EXACTLY THE SAME FORMAT AS THE TAPE
DIRECTORY. THESE HEADERS ARE USED ONLY TO RECONSTRUCT LOST
DIRECTORIES. THE COMMAND FORMAT IS:
*MTA0:/R_
-
IF SUCCESSFUL, MAGGIE RESPONDS WITH THE MESSAGE "DIRECTORY
RECONSTRUCTED."
NOTE
WHEN RECONSTRUCTING A
DIRECTORY, FILES WHICH HAD
BEEN PREVIOUSLY DELETED WILL
ONCE AGAIN BE IN THE
DIRECTORY. IF MANY FILES HAD
BEEN DELETED, THIS MAY CAUSE
MAGGIE TO STORE MORE THAN 500
FILES IN THE DIRECTORY AND
GIVE A DIRECTORY FULL ERROR.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 10
INTRODUCTION
2.1.6 TAG COMMAND (/T) -
THIS COMMAND ALLOWS THE USER TO LABEL HIS TAPE WITH ANY
SIX CHARACTER ID. THE FORM IS:
*MTA:/T_LABEL
-
WHERE "LABEL" IS A 6 CHARACTER IDENTIFICATION CODE.
ALTHOUGH ANY CHARACTERS IN SIXBIT CODE MAY BE USED, IT IS
ADVISIBLE TO AVOID NON-ALPHEBETIC AND NON-NUMERIC CHARACTERS
SINCE DIRECTORIES PRINTED WITH THESE NAMES AS FILENAMES ARE
NOT RECOGNIZED BY ALL PDP-10 SOFTWARE.
2.1.7 REWIND TAPE (/W) -
THE /W COMMAND REWINDS THE SPECIFIED TAPE AND WRITES A
FRESH COPY OF THE DIRECTORY FROM CORE TO TAPE (IF A COPY
EXISTS IN CORE). NOTE THAT MAGGIE COMMANDS POSITION THE
TAPE BY THEMSELVES AND NEED NO EXTERNAL ASSISTANCE. THE
FORM OF THIS COMMAND IS:
*MTA:/W_
-
WHERE MTA IS A PHYSICAL OR LOGICAL MAGNETIC TAPE NAME.
2.1.8 COPY FILES (/X) -
THIS COMMAND ALLOWS A USER TO COPY FILES FROM TAPE TO A
DEVICE AND FROM A DEVICE TO TAPE. MAGGIE WILL NOT COPY FROM
DISK TO DISK OR FROM DECTAPE TO DISK. ALL COPYS MUST
INVOLVE A MAGNETIC TAPE AND A DIRECTORY DEVICE FOR OUTPUT
(DISK OR DTA). THE FORM FOR THIS COMMAND IS:
*<ODEV:/X_<IDEV:<FILE.EXT,<IDEV:<FILE.EXT...
-
WHERE ODEV OS THE OUTPUT DEVICE; IDEV IS THE INPUT DEVICE;
AND THE DEFAULT FOR IDEV IS "DSK." WILDCARDS (* AND ?) ARE
PERMITTED IN FILE SPECS BUT NOT IN DEVICE SPECS. IF IDEV IS
NOT DSK, IT MUST BE STATED EXPLICITLY FOR EACH OCCURENCE IN
THE COMMAND STRING.
ON A COPY FROM DISK TO TAPE, THE UFD FOR THAT DEVICE IS
SCANNED AND THE FILES ENTERED DIRECTLY. FOR A COPY FROM
TAPE TO DISK, THE COMMAND LINE IS SCANNED AND THE FILES ARE
RETREIVED IN THE ORDER IN WHICH THEY APPEAR ON THE TAPE.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 11
INTRODUCTION
THIS ELIMINATES EXCESSIVE REWINDING AND DOES NOT REQUIRE THE
USER TO KNOW THE POSITION OF A FILE ON TAPE AT ANY TIME.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 12
OVERALL SPECIFICATIONS
3.0 OVERALL SPECIFICATIONS
AS DISTRIBUTED MAGGIE IS SPECIFIED AS FOLLOWS:
NAME MAGGIE.MAC
SOURCE LANGUAGE MACRO-10
SIZE 7+0 NON-REENTRANT
VERSION 1A(1)
HARDWARE REQUIRED MINIMUM 1 MAGTAPE DRIVE
SOFTWARE REQUIRED NONE
IN ADDITION, THE FOLLOWING ASSEMBLY PARAMETERS ARE SET:
NFILES==^D500 MAX. NUMBER FILES IN DIRECTORY
MT.MOD==13 I/O MODE FOR COPY OPERATIONS
PDLEN==20 INTERNAL STACK LENGTH
MAGGIE HAS ALSO DEFINED 4 I/O CHANNELS FOR DISK, MAGTAPE,
UFD SEARCHING, AND LISTING (CHANNELS 1-4).
3.1 DIRECTORY BLOCK STRUCTURE
THE DIRECTORY BLOCK (SEE 1.1.5 FOR TAPE STRUCTURE) IS
FORMATTED AS FOLLOWS:
-------------------------
I OF LAST FILE ON MTA I
I.......................I
I SIXBIT/TAPE LABEL/ I
I.......................I
I SIXBIT/FILENAME/ I
I.......................I
I SIXBIT/EXT/,,DATE I
I.......................I (THIS IS THE
I MODE,PROT,DATE2,TIME I STANDARD
I.......................I 4-WORD LOOKUP
I [P,PN] I BLOCK)
I.......................I
I (UNUSED),,POSITION I
I.......................I
I I
I (ETC) I
I I
-------------------------
WHERE THE STANDARD 4-WORD BLOCK IS SAVED FROM THE LOOKUP OF
EACH FILE, AND A FIFTH WORD ADDED TO DENOTE THE POSITION ON
THE TAPE. THE POSITION IS ACTUALLY THE POSITION IF HEADER
FILES ARE IGNORED, SO THAT THE FIRST FILE ON TAPE (POSITION
1) IS THE HEADER FILE FOR FILE #1.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 13
OVERALL SPECIFICATIONS
3.2 FILES ON THE TAPE--SPECIFICATIONS
MAGGIE HAS BEEN TESTED WITH THE 5.07 MONITOR, AND THESE
SPECIFICATIONS APPLY:
1. TAPE DENSITY IS 800 B.P.I
2. TAPE BLOCKSIZE IS 128 WORDS
3. FILES ARE WRITTEN IN IMAGE BINARY MODE (13)
4. ONE EOF FOLLOWS THE TAPE DIRECTORY
5. TWO EOF MARKS FOLLOW THE LAST PHYSICAL FILE ON
TAPE
6. THE BLOCKSIZE MAY BE CHANGED USING "SET BLOCKSIZE"
NOTE THAT IF THE USER HAS USED THE MONITOR COMMAND "SET
BLOCKSIZE" TO SET THE BUFFER SIZE ON ANY FILE, HE MUST
CONTINUE DOING THIS FOR THE ENTIRE TAPE. BLOCKSIZE IS A
PARAMETER SET AT MONGEN TIME AND IS INSTALLATION-DEPENDENT.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 14
GARBAGE COLLECTION
4.0 GARBAGE COLLECTION
AT PRESENT (VERSION 1A(1)) GARBAGE COLLECTION HAS NOT
BEEN IMPLIMENTED IN MAGGIE. INSTED THE FOLLOWING PROCEDURE
MAY BE USED TO COMPACT ONTO ANOTHER TAPE:
.MOUNT SCRATCH DISK
-
.R MAGGIE ;RUN MAGGIE
-
*MTA0:/F_ ;USE MTA0 FOR
-
*SCRATCH:/X_MTA1:*.* ;COLLECTING NEW
-
*MTA0:/XSCRATCH:*.* ;FILES FROM THE
- ;SCRATCH DISK.
*MTA0:/W_ ;REWIND MTA0 AND
- ;WRITE DRIECTORY.
GARBAGE COLLECTION WILL BE IMPLIMENTED IN THE NEXT RELEASE
OF MAGGIE.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 15
CREATION OF SAV FILE
5.0 CREATION OF SAV FILE
THE FOLLOWING SEQUENCE WILL MAKE MAGGIE.SAV, A CREF
LISTING, AND REL FILE:
.COMPIL MAGGIE.MAC/CREF
-
.CREF
-
.LOAD MAGGIE.REL
-
.SAVE
-
MAGGIE WILL CONFORM TO THE AFORE MENTIONED SPECIFICATIONS.
MAGGIE--PSEUDO RANDOM-ACCESS FOR MAGTAPES Page 16
MANTAINING MAGGIE
MAGGIE WILL BE PERIODICALLY UPDATED AND RE-SUBMITTED.
USERS WHO EXPERIENCE PROBLEMS WITH THIS PROGRAM ARE ASKED TO
SUBMIT A DESCRIPTION OF THE PROBLEM ALONG WITH A SAMPLE
PATCH IF POSSIBLE TO:
JOHN L. MOSS
FELDBERG COMPUTER CENTER
BRANDEIS UNIVERSITY
WALTHAM, MASS. 02154
THE PROBLEM WILL BE CORRECTED AS SOON AS POSSIBLE, AND
MAGGIE RE-RELEASED.
--DISCLAIMER--
NOTE
THE SOFTWARE DESCRIBED HEREIN
IS SUBJECT TO CHANGE WITHOUT
NOTICE. NEITHER THE AUTHOR
NOR BRANDEIS UNIVERSITY OR THE
FELDBERG COMPUTER CENTER
ASSUME RESPONSIBILITY FOR THE
USE OR RELIABILITY OF THIS
PROGRAM. IT IS STRONGLY
RECOMMENDED THAT EACH USER
BECOME THOROUGHLY FAMILIAR
WITH THE PROGRAM AND
DOCUMENTATION BEFORE USE.