*20
/	FRED -- FILE REPLACEMENT, ENTRY, AND DELETION
/	MAR 19, 1970
/
/
/	BETA REGISTER DEFINITIONS
/		(13 AND 14 ARE UNUSED)
/
	PARAM=1
	RDWR=2
	FDV=2
	PARM2=3
	XPNT=4
	XPNT2=5
	LP1=6
	LP2=7
	MARK=10
	ENTSW=11
	NFSW=12
	RET3=15
	RET2=16
	RETURN=17
/
/   LOAD ADDRESS OF DIAL INDEX -- DO NOT MODIFY: RAMIFICATIONS ARE OVERWHELMING
/
	INDEX=1000
/
/   PDP-8 MODE INSTRUCTIONS FOR USE AFTER IOB
/
	LRMF=6244
	LRIB=6234
	LRIF=6224
/
/
/     ENTRY POINTS FOR MAJOR ROUTINES OF FRED
/
/
	DJR
	JMP LOOKUP
	DJR
	JMP NTR0R.
/
/     RETURN IMMEDIATELY FOLLOWING THE JMP (P+1) IF THE FILE ALREADY EXISTS.
/     RETURN TO P+2 IF THERE IS NO ROOM FOR THE FILE.
/     RETURN TO P+3 IF OPERATION COMPLETE (DIAL INDEX HAS BEEN UPDATED).
/
NTR000,	SET RET3	/ SAVE RETURN
	0
	JMP LKP010	/ LOOKUP NAME IN INDEX
	JMP NTR020	/ THIS NAME IS NOT IN INDEX
	JMP NTR010	/ NAME IS IN INDEX, BUT NOT WITH THIS TYPE
/
/     WE FOUND A FILE OF THIS NAME AND TYPE
/
	LDA I 		/ GET CONSTANT -2
	-2
	ADD XPNT2	/ POINT TO POINTER AREA - 2
	STC MARK	/ SAVE PO 	/ INDICATE READ OPERATION
	700
	JMP COMMON 	/ GO TO COMMON PROCESSING
WRITE,	SET RETURN 	/ SAVE RETURN
	0
	SET I RDWR 	/ INDICATE WRITE OPERATION
	704
COMMON,	SET I RET2 	/ SET CODE FOR USER CALL
	7777
	JMP GETFLD 	/ SETUP TO ADDRESS PARAMETERS
RWENT,	LDA PARAM 	/ GET FIRST WORD OF PARAMETERS
	ROR 6		/ MOVE BANK NO TO RIGHT HALF
	STH		/ HOLD FOR EXTENDED ADDRESSING
	EXT
	ROL I 6		/ RESTORE UNIT BITS RIGHT
	BCL I		/ KEEP TWO HIGH-ORDER BITS FOR AXO
	7774		/. . .  PLUS LOW-ORDER IN LINK
	BSE I		/ SET HIGH-ORDER UNIT BITS FOR AXO
EXT,	0020
	AXO		/ SET EXTENDED OPERATIONS BITS
	LDA I PARAM	/ GET MEMORY ADDR FROM PARAMS
	STC MEMADD	/ HOLD FOR TAPE USE
	ROL I 4		/ GET UNIT BIT INTO POSITION
	BSE 		/ SET DESIRED READ/WRITE OP CODE
	RDWR
	STC CMND	/ SET READ/WRITE INSTRUCTION
	LDA I PARAM	/ GET START BLOCK NUMBER
	STC IOBLK	/ SET APPOROPRIATELY
	LDA I PARAM	/ BLOCK COUNT...
	COM		/... MADE NEGATIVE
	STC RDWR	/ STORE IN INDEX
IOLOOP,	LDA I		/ GET MEMORY ADDRESS FOR DATA
MEMADD,	0		/ ADDRESS FOR NEXT BLOCK
	TMA		/ TELL THE TAPE WHERE
	ADA I		/ UPDATE ADDRESS
	400		/ BY BLOCK LENGTH
	STC MEMADD	/ STORE NEW ADDR
CMND,	RDC		/ MODIFIED FOR DESIRED OPERATION
IOBLK,	0		/ BLOCK NUMBER WANTED
	LDA I		/ GET CONSTANT 1
	1
	ADM		/ UPDATE BLOCK NUMBER
	IOBLK
	XSK I RDWR	/ SKIP IF END OF OPERATION
	JMP IOLOOP	/ ELSE CONTINUE
	EJECT
/
/       IO IS COMPLETE -- RETURN TO CALLER
/
	XSK RET2	/ SKIP IF USER CALL
	JMP RETURN	/ RETURN NOW IF INTERNAL CALL
	IOB
	LRMF		/ RESTORE TO DESIRED STATUS
	SET 0		/ RESTORE RETURN JMP
	RETURN
	JMP 0		/ GO TO CALLER
/
/
/
/     GETFLD -- GET CALLERS FIELDS AND PARAMETERS
/
/     ENTERED IN LINC MODE, WITH 10-BIT PARAMETER POINTER IN AC.
/     RETURN WITH INDIRECT POINTER IN LOCATION 1 TO
/     DATA FIELD CONTAINING PARAMETERS.
/
GETFLD,	BSE I 		/ SET BIT 0 (SOON BECOMES BIT 1)
	4000
	ROL I 2		/ BIT 1 TO LINK
	ROR 2		/ RESTORE 2-11, SET BIT 1
	STC PARAM	/ HOLD AC CONTENTS
	STC ENTSW	/ CLEAR ENTSW
	IOB
	LRIB
	ROR 3		/ INST FLD TO AC 7-11
	LZE		/ SKIP IF PARMS IN INST FLD
	ROL 5		/ DF TO AC 7-11
	BCL I		/ DROP OTHER BITS
	7740
	BSE I		/ BUILD LDF INST
	LDF
	STC GTF010	/ SAVE IT
	LZE I		/ IS DF ALREADY SET?
GTF010,	LDF		/ NO - SET IT
	JMP 0		/ RETURN TO CALLER
	EJECT
/
/     LOOKUP - FIND NAMED FILE IN DIAL INDEX
/
/     ENTERED IN LINC MODE WITH ADDRESS OF A PARAMETER
/     LIST IN AC.
/     
/   0/ UNIT NUMBER  /
/   1/ FILE NAME    /
/   2/  CONTD       /
/   3/  CONTD       /
/   4/  CONTD       /
/   5/ TYPE (S OR B)/
/   6/ STARTING BLOCK 
/   7/ NO OF BLOCKS /
/ 
LOOKUP,	SET I RET3	/ INDICATE EXTERNAL CALL
	7777
LKP000,	SET RET2	/ SAVE RETURN JMP
	0
	JMP GETFLD 	/ SETUP PARAMETER POINTER
/
/     READ THE INDEX
/
	SET PARM2	/ MOVE PARAMETER POINTER TO ALT AREA
	PARAM
	LDA	 I	/ INIT AC
	1
	IOB
	LRIF		/ GET INSTRUCTION FIELD
	ROL 3		/ MOVE FIELD NO TO RIGHT HALFWORD
	STH 		/ STORE DATA ADDRESS FOR INDEX READ
	XPARM+1
	ROL 3		/ BANK NO TO BITS 0-2
	BCL I		/ DROP ALL BUT BANK NO
	0777
	BSE PARM2	/ COMBINE WITH UNIT NO
	STC XPARM	/ STORE INTO PARAMETER LIST
	SET I RDWR	/ SETUP READ CODE
	700
	SET I RETURN	/ SETUP RETURN JMP FROM READ
	JMP LKP010	/ INST MOVED FOR LATER USE
	SET I PARAM 	/ SETUP PARAMETER POINTER
	XPARM
	JMP RWENT	/ GO TO READ INDEX
LKP010,	SET I XPNT
	INDEX
	LDA XPNT	/ GET FIRST WORD OF INDEX
	SAE I		/ SKIP IF VALID FOR INDEX
	5757		/ FIRST WORD OF INDEX
	SKP		/ NOT AN INDEX -- BUILD ONE
	JMP LKP020	/ INDEX IS OK -- GO TO NAME SCAN
/
/     THERE IS NO INDEX -- CREATE ONE
/
	LDA I		/ GET FILLER WORD
	5757
	STA XPNT	/ STORE IN NEXT INDEX WORD
	XSK I XPNT	/ INCREMENT AND TEST FOR END
	JMP .-2		/ ZAP ANOTHER
	STA XPNT	/ ZAP LAST WORD
	XSK I PARM2	/ MAKE PARM2 LOOK LIKE WE SOUGHT MATCH
	JMP ERRTN	/ RETURN NO FIND
	EJECT
/
/     SCAN INDEX FOR NAME
/
LKP020,	LDA I PARM2	/ GET FIRST WORD OF NAME
	STC WORD1	/ SAVE AT COMPARE INST
LKP030,	LDA I		/ CONSTANT 7
	7
	ADM		/ ADD IT TO INDEX POINTER
	XPNT
	XSK XPNT	/ TEST FOR END OF INDEX
	SKP		/ SKIP NOT END
	JMP ERRTN	/ OTHERWISE RETURN NO SUCCESS
	LDA I XPNT	/ GET A WORD OF INDEX NAME
	SAE I		/ SKIP OUT OF LOOP IF FIRST WORDS EQUAL
WORD1,	0
	JMP LKP030	/ LOOP IF NOT EQUAL
	SET XPNT2	/ FIRST WORDS EQUAL
	XPNT		/ START FINAL COMPARE
	SET FDV		/ POINT TEMPORARY FDV INDEX
	PARM2
	SET I LP2	/ SET LOOP COUNTER
	-3
LKP050,	LDA I FDV	/ GET NEXT TWO CHARS
	SAE I XPNT2	/ COMPARE TO THOSE IN INDEX ENTRY
	JMP LKP030	/ UNEQUAL - RETURN TO SEARCH LOOP
	XSK I LP2	/ LOOP TO COMPARE ENTIRE NAME
	JMP LKP050
/
/     IF WE GET HERE, WEVE FOUND THE NAME
/
	LDA I FDV	/ PICK UP SOURCE/BINARY CODE
	SHD I		/ IS THE CODE S?
	2300
	JMP WNTS	/ YES - GIVE HIM SOURCE
	SHD I 		/ IS THE CODE B?
	0200
	JMP WNTB	/ YES - GIVE HIM BINARY
/
/     COME HERE ON DETECTING ERROR, OR UNSUCCESSFUL FIND
/
ERRTN,	XSK RET3	/ TEST FOR INTERNAL CALL
	JMP RET2	/ RETURN NOW IF INTERNAL
	SET 0		/ MOVE IN RETURN JMP
	RET2
	IOB
	LRMF
	JMP 0		/RETURN TO CALLER
	EJECT
/
/     WEVE FOUND WHAT HE WANTS - GIVE IT HIM
/
WNTB,	XSK I XPNT2	/ CANT SKIP, BUT THIS ...
	XSK I XPNT2	/...FAKES OUT THE POINTER
WNTS,	XSK RET3	/ IF INTERNAL CALL...
	XSK I RET2	/...SETUP FOR THREE RETURNS
	LDA I XPNT2	/ GET STARTING BLOCK NO FROM INDEX
	STA I FDV	/ STORE IN CALLERS PARAMETER LIST
	LDA I XPNT2 	/ GET NO OF BLOCKS
	APO		/ SKIP IF DESIRED DATA EXISTS
	JMP ERRTN	/ RETURN ERROR IF NO FILE
	XSK RET3	/ DONT STORE RESULT IF INTERNAL
	SKP
	STA I FDV	/ RETURN NO OF BLOCKS
	XSK I RET2	/ INCREMENT JMP RETURN ADDRESS
	JMP ERRTN	/ NOT REALLY AN ERROR
/
/     PARAMETERS TO READ ROUTINE
/
XPARM,	0		/ FIELD AND UNIT
	INDEX		/ DATA ADDRESS
	346		/ BLOCK NUMBER
	2		/ BLOCK COUNT
	EJECT
/
/     REPLACE -- REPLACE A NAMED ENTRY IN DIAL INDEX
/
/     ENTERED IN LINC MODE AFTER CALLING ENTER.
/     MAY BE CALLED ONLY IMMEDIATELY AFTER ENTER HAS RETURNED TO P+1,
/     INDICATING THAT A FILE OF THE PROPOSED NAME AND TYPE ALREADY EXISTS.
/
RPL000,	SET RET3	/ SAVE RETURN
	0
	XSK I ENTSW	/ TEST FOR NAME FOUND, SET "REPLACE"
RPL010,	HLT		/ ILLEGAL SEQUENCE -- STOP
	XSK ENTSW	/ TEST FOR CONTINUE AFTER HALT
	JMP RPL010	/ BAD BOY -- STOP AGAIN
	JMP GTF010	/ SET CORRECT DF
	LDA I		/ ZAP LENGTH FIELD OF THIS FILE
	5757
	STA XPNT2
	JMP FSP000	/ ALL LOOKS GOOD -- DO YOUR THING
/
/     ENTER -- ADD A NAMED ENTRY TO DIAL INDEX
/
/     ENTERED IN LINC MODE WITH AC POINTING TO A PARAMETER LIST
/     IDENTICAL TO THAT FOR LOOKUP, EXCEPT THAT THE FILE-LENGTH
/     FIELD IS FILLED BY THE USER.
/
/     RETURN IMMEDIATELY FOLLOWING THE JMP (P+1) IF THE FILE ALREADY EXISTS.
/     RETURN TO P+2 IF THERE IS NO ROOM FOR THE FILE.
/     RETURN TO P+3 IF OPERATION COMPLETE (DIAL INDEX HAS BEEN UPDATED).
/
NTR000,	SET RET3	/ SAVE RETURN
	0
	JMP LKP000	/ LOOKUP NAME IN INDEX
	JMP NTR020	/ THIS NAME IS NOT IN INDEX
	JMP NTR010	/ NAME IS IN INDEX, BUT NOT WITH THIS TYPE
/
/     WE FOUND A FILE OF THIS NAME AND TYPE
/
	LDA I 		/ GET CONSTANT -2
	-2
	ADD XPNT2	/ POINT TO POINTER AREA - 2
	STC MARK	/ SAVE POINTER FOR REPLACE
	SET I ENTSW	/ INDICATE READY-FOR-REPLACE
	1776
	JMP RTRN0	/ GO HOME
/
/     FOUND THE NAME, BUT NOT TYPE
/
NTR010,	LDA I		/ CONSTANT -2
	-2
	ADD XPNT2	/ FROM POINTER INDEX
	STC MARK	/ SAVE ADDR OF FILE POINTERS
	JMP NTR030	/ GO BEGIN SCAN FOR FILE SPACE
/
/     NOTHING FOUND IN THE LOOKUP SCAN
/
NTR020,	SET I MARK	/ INDICATE NO FIND
	7777
NTR030,	XSK I RET3	/ NO NAME CONFLICT, INCREMENT RETURN
	EJECT
/
/     FSP - FIND SPACE ON DIAL TAPE FOR NEW FILE
/
FSP000,	LDA I		/ PICK UP SKIP-NEG INSTRUCTION
	APO I		/ MOVED TO FCF050
	STC FCF050	/ STORE IN INDEX-SCAN ROUTINE
	LDA I
	5
	ADD PARM2	/ POINT TO USERS START BLOCK FIELD
	STA 		/ HOLD FOR LATER
	LP1
	STC LP2		/ STORE POINTER
	LDA I LP2	/ PICK UP LENGTH
	APO		/ TEST FOR POSITIVE LEN REQUEST
	JMP RTRN0	/ ELSE RETURN ERROR 
	AZE I		/ SKIP IF LEN NOT ZERO
	JMP RTRN0	/ BOMB IF NULL REQUEST
	STA 		/ HOLD LENGTH HANDY
	TRYLEN
	COM
	ADA I		/ SUBTRACT LEN FROM HIGHEST BLOCK NO, LOW FILE
	270
FSP010,	AZE I		/ SKIP NOT ZERO
	CLR		/ FORCE TRUE ZERO IF RESULT IS 7777
	APO		/ SKIP IF STILL ON THE TAPE
	JMP FSP020	/ NO SPACE IN LOW FILE AREA
	STC TRY		/ HOLD TRIAL STARTING BLOCK
	JMP FCF000	/ GO FIND POSSIBLE CONFLICT
	JMP FSP030	/ HOORAY -- NO CONFLICT
	LDA		/ NOPE -- THAT TRY IS NO GOOD
	TRYLEN
	COM		/ SUBTRACT THE SEARCH LENGTH FROM...
	ADA XPNT	/... THE START BLOCK OF CONFLICT FILE...
	JMP FSP010	/...AND TRY AGAIN
/
/     WEVE FOUND NO SPACE LARGE ENOUGH IN THE LOWER FILE AREA
/
FSP020,	SET I NFSW	/ SET NO-FIND SWITCH
	0
	LDA I		/ PICK UP MINUS END OF TAPE
	-1000
	ADD TRYLEN	/ MINUS LAST FEASIBLE START BLOCK
	STC UPLIM	/ HOLD AS SCAN LIMIT
	JMP FSP035	/ ENTER UPPER SCAN
/
/     TRY POINTS TO GOOD SPACE IN LOWER AREA
/
FSP030,	SET I NFSW	/ INDICATE SPACE FOUND
	7777
	LDA		/ PICK UP OLD TRY
	TRY
	STA		/ SAVE IT
	SVTRY
	ADD TRYLEN	/ GET END BLOCK
	ADA I		/ GET COMPARE CONSTANT (TRYEND-2*INDEX LOC)
	-716
	STC UPLIM	/ MINUS HIGHEST DESIRABLE STARTING BLOCK
FSP035,	LDA I 		/ GET SKIP-POS INSTRUCTION
	APO		/ MOVED TO FCF050
	STC FCF050	/ STORE IN INDEX SCAN ROUTINE
	LDA I 		/ INITIAL STARTING BLOCK, UPPER FILE
	470
FSP040,	STA		/ SET NEW TRY BLOCK
	TRY
	ADD UPLIM	/ COMPARE TO MAXIMUM USABLE BLOCK
	APO I		/ SKIP IF STILL IN USEFUL REGION
	JMP FSP050	/ NO SPACE IN THIS AREA
	JMP FCF000	/ SEARCH FOR CONFLICT
	JMP FSP060	/ WEVE FOUND SPACE
	LDA XPNT	/ THIS TRY WONT WORK...
	ADA XPNT2	/...SO TRY AT END OF CONFLICT FILE
	JMP FSP040
/
/     THERE WAS NO SPACE FOUND IN UPPER FILE AREA
/
FSP050,	XSK NFSW	/ SKIP IF FOUND IN LOWER AREA
	JMP RTRN0	/ RETURN BAD NEWS -- NO SPACE
	LDA		/ GET START BLOCK OF FILE IN LOWER AREA
	SVTRY
	STC TRY		/ THATS THE ONE WELL USE
/
/     THERE IS SPACE AT TRY
/
FSP060,	XSK MARK	/ WAS THERE A FILE BY THIS NAME
	JMP FSP100	/ YES - GO USE THAT ENTRY
/
/     WE MUST SEARCH FOR EMPTY INDEX SPACE
/
	SET I MARK	/ INITIALIZE MARK POINTER
	INDEX
FSP070,	LDA I 		/ BUMP INDEX INDEX
	7
	ADM
	MARK
	XSK MARK	/ TEST FOR END OF INDEX
	SKP		/ NOT END
	JMP RTRN0	/ NO SPACE IN INDEX -- RETURN ZERO
	LDA I MARK	/ FIRST WORD OF INDEX NAME
	SAE I		/ CHECK FOR EMPTY ENTRY
	5757
	JMP FSP070	/ NOT EMPTY, TRY NEXT
/
/     MARK POINTS TO AN UNUSED INDEX ENTRY
/     PUT THE NAME INTO IT
/ 
	LDA PARM2	/ FIRST WORD OF USER NAME
	STA MARK	/ PLUNK INTO INDEX
	LDA I PARM2	/ 2ND
	STA I MARK
	LDA I PARM2	/ 3RD
	STA I MARK
	LDA I PARM2	/ 4TH
	STA I MARK
	LDA I PARM2	/ TYPE CONTROL (S OR B)
	SHD I		/ IS TYPE S
	2300
	JMP FSP080	/ YES
	SHD I		/ IS TYPE B
	0200
	JMP FSP090	/ YES
	JMP RTRN0	/ NO-- BOMB NOW
	EJECT
/
/     HE WANTS A SOURCE FILE -- SCRATCH THE BINARY POINTERS
/
FSP080,	SET LP2		/ TEMP POINTER
	MARK
	XSK I LP2	/ CANT SKIP
	XSK I LP2	/ DITTO
	LDA I 		/ GET 57S...
	5757
	STA I LP2	/ STORE THEM...
	STA I LP2	/... IN BINARY POINTERS
	JMP FSP100
/
/     HE WANTS BINARY FILE
/
FSP090,	LDA I 
	5757
	STA I MARK	/ STORE 57S...
	STA I MARK	/...IN SOURCE POINTERS
/
/     MARK NOW POINTS TO POINTER AREA OF DESIRED TYPE IN A NAMED INDEX ENTRY
/
FSP100,	LDA		/ PICK UP STARTING BLOCK
	TRY
	STA I MARK	/ STORE IN INDEX
	STA LP1		/ STORE IN USERS LIST
	LDA I LP1	/ GET LENGTH
	STA I MARK	/ STORE IN INDEX
/
/     NOW EVERYBODY IS HAPPY EXCEPT THE TAPE, WHICH HASNT BEEN UPDATED
/
	SET I RDWR	/ SETUP WRITE CODE
	704
	SET I RETURN	/ SETUP RETURN JMP
	JMP FSP110	/ INST MOVED FOR LATER USE
	SET I PARAM	/ SETUP PARAMETER POINTER
	XPARM
	JMP RWENT	/ GO DO THE WRITE
FSP110,	XSK I RET3	/ BUMP RETURN ADDR
RTRN0,	SET 0		/ MOVE RETURN JMP TO 0
	RET3
	IOB
	LRMF		/ RESTORE USERS FIELDS
	JMP 0		/ GO TO CALLER
	EJECT
/
/     FIND POSSIBLE CONFLICT BETWEEN INDEX ENTRY AND TRIAL STARTING BLOCK
/
/     CALLER MUST SET OR CLEAR I-BIT IN FCF050 TO SELECT DESIRED FILE AREA
/
FCF000,	SET RET2	/ SAVE RETURN
	0
	SET I XPNT	/ INITIALIZE POINTER TO INDEX IN CORE
	INDEX+6
FCF010,	XSK I XPNT	/ SKIP ON END OF INDEX
	SKP
	JMP RET2	/ END OF INDEX, RETURN NO CONFLICT
	XSK I XPNT	/ INCREMENT AGAIN, NO SKIP POSSIBLE
	LDA		/ PICK UP POINTER
	XPNT
	ROR I 3		/ MOVE BIT 9 TO LINK
	LZE		/ SKIP IF NAME AREA OF ENTRY
	JMP FCF040	/ JMP IF POINTER AREA
	LDA XPNT	/ GET FIRST WORD OF NAME
	SAE I		/ SKIP IF EMPTY ENTRY
	5757
	JMP FCF030	/ WORD IS VALID NAME
	LDA I		/ GET CONSTANT 6
	6
	ADM		/ ADDRESS NEXT ENTRY - 2, THIS ONE IS EMPTY
	XPNT
	JMP FCF010	/ TRY NEXT INDEX ENTRY
FCF030,	LDA I		/ INCREMENT BY 4
	4
	ADM		/...TO ADDRESS POINTER
	XPNT
/
/     XPNT NOW ADDRESSES A STARTING BLOCK NO
/
FCF040,	LDA XPNT	/ PICK UP STARTING BLOCK
	ADA I		/ SUBTRACT INDEX LOCATION
	-347
FCF050,	APO		/ REVERSE SENSE BIT MAY BE SET BY CALLER
	JMP FCF010	/ TRY AGAIN IF WRONG FILE AREA
	SET XPNT2	/ TEMP POINT TO LENGTH WORD
	XPNT
	LDA I XPNT2	/ PICK UP LENGTH
	APO		/ SKIP IF LENGTH POS
	JMP FCF010	/ NEG LEN -- NO FILE HERE
	EJECT
/
/     WE NOW HAVE A VALID INDEX ENTRY
/     COMPARE IT TO TRY
/
	LDA XPNT	/ STARTING BLOCK OF THIS FILE
	BCL I		/ CLEAR GARBAGE IN HIGH THREE BITS
	7000
	COM
	ADD TRY		/ SUBTRACT XSTART FROM TRY
	APO		/ SKIP IF TRY ABOVE XSTART
	JMP FCF060	/ JMP IF BELOW
/
/     TRY IS ABOVE THE START OF THIS FILE
/
	COM		/ MAKE DIFFERENCE NEGATIVE
	ADA XPNT2	/ SUBTRACT DIFFERENCE FROM FILE LENGTH
	APO		/ ZERO RESULT WILL BE NEG (7777)
	JMP FCF010	/ NO CONFLICT, TRY NEXT ENTRY
	JMP FCF070	/ CONFLICT FOUND -- RETURN
/
/     THE TRY IS BELOW OR AT THE START OF THIS FILE
/
FCF060,	ADD TRYLEN	/ SUBTRACT STARTING DIFF FROM LEN OF TRY
	APO		/ SKIP IF CONFLICT
	JMP FCF010	/ NO CONFLICT - TRY NEXT ENTRY
/
/     WE HAVE FOUND A CONFLICT -- RETURN IT TO CALLER
/
FCF070,	XSK I RET2	/ INCREMENT RETURN ADDRESS
	JMP RET2	/ GO BACK
/
/     WORK AREA
/
TRY,	0
TRYLEN,	0
SVTRY,	0
UPLIM,	0
	EJECT
/
/     DELETE -- REMOVE A FILE FROM THE DIAL INDEX
/
/     SAME CALLING SEQUENCE AS LOOKUP, EXCEPT NO ALTERNATE RETURNS
/
DEL000,	SET RET3	/ SAVE RETURN
	0
	JMP LKP000	/ LOOKUP NAME IN INDEX
	JMP RTRN0	/ DIDNT FIND THE FILE
	JMP RTRN0	/ DITTO
	LDA I		/ DECREMENT XPNT2
	-1
	ADM		/...TO ADDRESS START BLOCK FIELD
	XPNT2
	LDA I		/ EMPTY AREA INDICATOR
	5757
	STA XPNT2	/ ZAP START BLOCK FIELD
	STA I XPNT2	/ DITTO LEN
	LDA 		/ GET POINTER
	XPNT2
	BCO I		/ ADDRESS OTHER TYPE LEN FIELD
	2
	STC XPNT2
	LDA XPNT2	/ PICK LENGTH OF OTHER-TYPE FILE
	APO I		/ SKIP IF OTHER-TYPE EMPTY
	JMP DEL030	/ GO RE-WRITE INDEX
	LDA I		/ BOTH TYPES EMPTY -- CLEAR NAME
	5757
	STA XPNT	/ ZAP FIRST WORD OF NAME
	STA I XPNT	/ 2ND
	STA I XPNT	/ 3RD
	STA I XPNT	/ 4TH
/
/	WAS THAT THE LAST FILE
/
	SET I XPNT	/ POINT TO START OF INDEX
	INDEX-1
DEL010,	SAE I XPNT	/ IS THERE A NON-EMPTY ENTRY
	JMP DEL030	/ YES - REWRITE
	XSK XPNT	/ CHECK FOR END
	JMP DEL010	/ NOT YET - LOOP
/
/	INDEX IS EMPTY: MAKE IT A NON-INDEX
/
	CLR
	SET I XPNT	/ POINT TO INDEX
	INDEX-1
	STA I XPNT	/ ZERO ONE WORD
	XSK XPNT	/ LAST ONE ?
	JMP .-2		/ NO - LOOP
/
/     RE-WRITE INDEX
/
DEL030,	SET I RDWR	/ SET WRITE CODE
	704
	SET I RETURN	/ RETURN JUMP FOR R/W ROUTINE
	JMP RTRN0
	SET I PARAM
	XPARM
	JMP RWENT	/ DO THE WRITE THING, AND RETURN TO CALLER
	EJECT
/
/     THIS WILL CAUSE AN ASSEMBLY ERROR IF ROUTINE BECOMES SO LARGE
/     THAT INDEX WILL OVERLAY CODE WHEN IT IS READ IN
	ASMIFM INDEX-.
	NAUGHTY BAD BOY - ROUTINE IS TOO BIG FOR ONE FIELD.
/	IN CASE OF MINOR SIZE PROBLEMS, REMOVE 5 LINES OF CODE AT FCF040.
/	REMOVE 3 LINES AT FSP000, AND THREE LINES AT FSP035.  THIS SHOULD
/	REMOVE ALL REFERENCES TO FCF050.  ALL OTHER TAGS MUST BE RETAINED.
/
/
/
/	END OF FRED
/