.SBTTL	DIRECTIONS
;
;	...DFX IS AN RSX PROGRAM TO DO ABSOLUTE DISK PATCHES ON
;	ANY DISK. CALLING SEQUENCE IS VIA A 
;
;	MCR>DFX
;
; IN RESPONSE TO ENTER DISK BLOCK # TYPE BLOCK NUMBER IN OCTAL
; OR "E" TO EXIT TO RSX. THE BLOCK WILL BE READ IN AND CAN BE
; DISPLAYED BY THE "L" COMMAND. DISPLAY IS ON LUN 6
;
; NOTE THAT LUN 2 IS USED FOR DISK READS AND LUN 4 FOR DISK WRITES,
; AS A PROTECTIVE MEASURE THESE ARE BOTH ASSIGNED TO DEVICE XX:
; AND MUST BE RE-ASSIGNED BY THE USER BEFORE RUNNING ...PAT
;
; ALSO NOT THAT LUN 6 IS USED FOR FULL BLOCK LISTINGS. IT IS INITIALLY
; SET TO TI: BUT CAN BE RE-ASSIGNED TO A DISK, AND WILL BE IN THE USERS
; UIC AS "DFX.DAT"
;
; IN RESPONSE TO "*" PROMPT, TYPE
; 
; L TO LIST REFERENCED BLOCK
; W TO WRITE THE CURRENTLY REFERENCED BLOCK BACK ONTO DISK
; N TO READ THE NEXT BLOCK
; R TO REREAD THE CURRENT BLOCK (WIPING OUT ALL CHANGES IN THE CURRENT
; 	BUFFER)
; B TO READ THE PREVIOUS BLOCK
; F FOR FULL-WORD ADDRESSES	(DEFAULTS TO BYTE ADDRESSES)
; H FOR HALF-WORD (BYTE) ADDRESSES IN BLOCK
; T TO TYPE OUT THE BLOCK AS ASCII TEXT
; S TO SET/CLEAR FLAG FOR SPOOLING OUTPUT FILE TO LP
;	IF LUN 6 IS A DISK, THE FILE WILL BE SPOOLED ON EXIT OR WHEN
;	THE SPOOLING FLAG IS CLEARED BY THE OPERATOR
; E TO EXIT TO THE MONITOR
; 
;		THERE ARE 4 M(ODIFY) TYPE COMMANDS, WHERE 
;		M=THE BYTE OFFSET OF THE BUFFER WORD TO BE LISTED/MODIFIED
; M/000000	CHANGE BUFFER WORD TO THE OCTAL VALUE 000000
; M,LLL		CHANGE BUFFER WORD TO RAD50 VALUE OF "LLL"
; M;AA		CHANGE BUFFER WORD TO ASCII VALUE OF "AA"
; M:		DISPLAY BUFFER WORD IN OCTAL, RAD50 AND ASCII
;	NOTE THAT FOR M COMMANDS, M MUST BE EVEN, 0 <= M < 1000
;
; 
; D,N TO CHANGE DEFAULT BLOCK NUMBER FOR READ AND WRITE TO N
;	WITHOUT CHANGING THE CONTENTS OF THE BUFFER IN CORE. THIS SHOULD
;	PERMIT MOVING DATA FROM ONE BLOCK TO ANOTHER.
; A,N TO READ AND LIST BLOCK N (N ABSENT IMPLIES NEXT BLOCK
; C,N TO READ AND LIST ALL BLOCKS UP TO AND INCLUDING BLOCK N.
; 	(N ABSENT IMPLIES TO END OF DISK.)
; P,N CHANGES THE HIGH-ORDER BLOCK NUMBER FROM THE DISK.
;	NO I/O WILL BE DONE, BUT THE BLOCK NUMBER WILL BE COPIED
;	FROM THE HIGH-ORDER AND LOW-ORDER BLOCKS TO RELATIVE
;	WORDS 400 AND 401 (BYTES 1000 AND 1002) JUST PAST THE I/O BUFFER
;	WHERE THE SINGLE-WORD EXAMINING COMMANDS CAN SEE THEM.
;
;
;	NOTE NOTE NOTE, DUE TO AN OBTUSE QUIRK IN THE PROGRAM, ALL
;	OCTAL VALUES ENTERED IN COMMANDS MUST BE 6 DIGITS LONG
;