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/DECNET/8 V1A LSN TASK
/
/
/
/
/
/
/COPYRIGHT  (C)  1976,1977 BY DIGITAL EQUIPMENT CORPORATION
/
/
/
/
/
/
/
/
/
/
/THE INFORMATION IN THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE
/AND SHOULD NOT BE CONSTRUED AS A COMMITMENT BY DIGITAL EQUIPMENT
/CORPORATION.  DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY
/FOR ANY ERRORS THAT MAY APPEAR IN THIS DOCUMENT.
/
/THE SOFTWARE DESCRIBED IN THIS DOCUMENT IS FURNISHED TO THE PURCHASER
/UNDER A LICENSE FOR USE ON A SINGLE COMPUTER SYSTEM AND CAN BE COPIED
/(WITH INCLUSION OF DIGITAL'S COPYRIGHT NOTICE) ONLY FOR USE IN SUCH
/SYSTEM, EXCEPT AS MAY OTHERWISE BE PROVIDED IN WRITING BY DIGITAL.
/
/DIGITAL EQUIPMENT CORPORATION ASSUMES NO RESPONSIBILITY FOR THE USE
/OR RELIABILITY OF ITS SOFTWARE ON EQUIPMENT THAT IS NOT SUPPLIED BY
/DIGITAL.
/
/
/	ADMIRAL COMPANION TO DECNET/8 TLK

/	S.R. - MAY 1976
/JR	11-JAN-77	ADDED NSP CYCLE2 COMPATIBLILTY
/
/ DECNET/8 RELEASE VERSION 1
/ DECNET/8 PATCH LEVEL A
/ APRIL 8,1977
/
	VERSION=1
	PATCH="A
/
/	THERE MAY BE MULTIPLE LSN TAKS ON A SYSTEM
/	IF SO, ONE WOULD USE A TLK CONTROL BLOCK (TCB)

	IFNDEF LSNFLD <LSNFLD=30>
	IFNDEF LSNLOC <LSNLOC=4000>
	IFNDEF LSNCHN <LSNCHN=2>

	CUR=LSNFLD
	CHANNL=LSNCHN
	INIWT=0
	NXTERR=22	/NON-EXISTENT TERMINAL
	RBUFLN=	160	/SIZE FF RECEIVE BUFFER

	IFNDEF LSNNUM <LSNNUM=1>

	IFNDEF LSN1 <LSN1=LSN>

	IFZERO LSNNUM-1 <TASK=LSN1>
	IFZERO LSNNUM-2 <TASK=LSN2>
	IFZERO LSNNUM-3 <TASK=LSN3>
	IFZERO LSNNUM-4 <TASK=LSN4>
	IFZERO LSNNUM-5 <TASK=LSN5>
	IFZERO LSNNUM-6 <TASK=LSN6>
	IFZERO LSNNUM-7 <TASK=LSN7>
/
/	IF IT IS DESIRED TO BE ABLE TO LISTEN
/	ON MORE THAN 7 TABLES, THE TABLE ABOVE
/	CAN BE EASILY EXPANDED.

	FIELD CUR%10
	*LSNLOC
	VERSION		/VERSION
	PATCH		/AND PATCH IN CORE
START,	AC4000
	DCA TTYTSK
	CAL
	BLKARG
	MSGWT		/SIT AND WAIT FOR SOMETHING TO HAPPEN
	TAD TTYTSK
	SPA CLA
	JMP START	/IGNORE EVERYTHING IF 'TTYTSK' IS STILL NEGATIVE
	TAD (-RBUFLN+1	/ALLOW GETTING BUFSIZ-1 CHARS OF MESSAGE
	DCA RLEN
	CAL		/RECEIVE DATA FROM REMOTE TLK
	SENDW
	NSP
	RMSG		/RECEIVE
	TAD RSTA	/LOOK AT THE STATUS
	SZA CLA
	JMP DISC	/DISCONNECT ON SLIGHTEST ERROR
	TAD RLEN	/LOOK AT LENGTH RECEIVED
	CIA		/MAKE POSITIVE
	TAD (RBUF	/GET PTR TO FIRST BYTE AFTER END OF BUFFER
	DCA RPTR
	DCA I RPTR	/PUT 0 AT END OF BUFFER
	JMS I	(PUTPRE	/PRINT PRELIMINARY INFORMATION
	CAL
	SENDW		/SEND MESSAGE TO CORRECT TERMINAL
TTYTSK,	4000		/TTY NUMBER WE'RE SENDING TO
	TTMSG
	JMP START	/REITERATE
DISC,	CAL
	SENDW
	NSP
	DMSG
	JMP	START	/LOOP FOR MORE

DMSG,	ZBLOCK 3
		0
	DISCON
	CHANNL
	0

TTMSG,	ZBLOCK 3
	NOPACK+IND
	0
	RBUF		/SEND DATA FROM RECEIVE BUFFER

RMSG,	ZBLOCK 3
RSTA,	0
	RCVMSG
	CHANNL
	CDF CUR
	RBUF
RLEN,	-RBUFLN+1
REJ,	ZBLOCK 3
	0
	CONREJ
	CHANNL
	OPT2		/REJECT WITH BAD TTY MESSAGE IN OPT DATA

RPTR,	0

CNF,	ZBLOCK 3
CNFSTA,	0
	CONCNF
	CHANNL
	0		/NO OPTIONAL DATA
TTYTAB,		0;	TTY
		1;	TTY
		2;	TTY
IFDEF LPT <	3;	LPT>
IFDEF TTY2 <	4;	TTY2>
		4000
TSRCH,	0
	TAD (TTYTAB-1
	DCA TPTR	/SEARCH TTY TABLE FOR THIS NUMBER
TLUP,	ISZ TPTR
	TAD I TPTR
	SPA
	JMP I TSRCH	/A NEGATIVE NUMBER ENDS TABLE
	ISZ TPTR	/POINT TO ASSOCIATED TASK
	CIA
	TAD I (TTNUM
	SZA CLA		/HAVE WE FOUND IT?
	JMP TLUP	/NO, KEEP LOOKING
	TAD I TPTR	/YES, GET ASSOCIATED TASK
	SNA
	JMP I TSRCH	/TASK NON-EXISTENT
	DCA I (TTYTSK	/STORE AWAY
	ISZ TSRCH
	JMP I TSRCH

TPTR,	0
	PAGE
RBUF,	ZBLOCK RBUFLN
	/THE CCB FOLLOWS THE BUFFER IMMEDIATLY
	CCB=.

	*CCB+12

	0
	TEXT	/TLK/
	ZBLOCK	4

	1;2

	*CCB+130

USRAST,	TAD CCBRSN	/WHY WERE WE TRAPPED?
	TAD (-CONRSN
	SNA CLA
	JMP CON		/A CONNECT REQUEST
BAD,	CAL
	SENDW
	NSP
	DMSG		/DISCONNECT JUST IN CASE
/	TAD (START
/	DCA CCBPC	/JR TAKE OUT RESTART TO PREVENT DISCARD OF MESSAGES
	JMP CCBRTN	/GO BACK TO 'START' AT MAIN LEVEL

CON,	DCA TTNUM
	TAD I (TTYTSK
	SMA CLA
	JMP	NOTFND	/SHOULD NEVER HAPPEN
	TAD I (CCBOPL	/HOW MUCH OPTIONAL DATA DID WE GET?
	SNA CLA
	JMP NOTFND	/NO OPTIONAL DATA
	TAD CCBOPT
	DCA TTNUM	/GET TERMINAL NUMBER
	TAD CCBOPT+2
	DCA SRCTTY	/GET SOURCE TERMINAL NUMBER
	JMS I (TSRCH
	JMP NOTFND
	CAL
	SENDW
	NSP
	CNF		/ACCEPT THE CONNECTION
	TAD I (CNFSTA
	SNA CLA
	JMP CCBRTN
	JMP BAD

NOTFND,	CLA
	TAD TTNUM
	DCA OPT2+1	/SEND BACK BAD TTY NUMBER
	CAL
	SENDW
	NSP
	REJ		/REJECT THE CONNECTION
	JMP CCBRTN

OPT2,	NXTERR;0;-1

TTNUM,	0
SRCTTY,	0
	PAGE
	/PRINT PRELIMINARY INFORMATION OF THE FORM

	/ TLK>NODNAM_TTN:

PUTPRE,	0
	TAD	(PREBUF	/SET BUFFER POINTER
	DCA	BUFPTR
	JMS	PUTNAM	/GO PUT IN NODE NAME
	CCBND1
	TAD	("_	/PRINT BACKARROW
	JMS	PCH
	TAD	("T	/PRINT TTN
	JMS	PCH
	TAD	("T
	JMS	PCH
	TAD I	(SRCTTY
	AND	(7
	TAD	("0
	JMS	PCH
	TAD	(":	/PRINT COLON
	JMS	PCH
	DCA I	BUFPTR	/MARK END OF TEXT
	TAD I	(TTYTSK	/COPY TTY TASK NUMBER INLINE
	DCA	TTYTS2
	CAL
	SEND
TTYTS2,	4000
	PREMSG
	JMP I	PUTPRE	/DONE
PREMSG,	ZBLOCK	3	/SPACE FOR EF AND LINKAGE
	NOPACK+NOCRLF	/FORMAT CONTROL
	0		/NO INPUT
	"T;"L;"K;">
PREBUF,	ZBLOCK	20	/THE BUFFER

PCH,	0
	DCA I	BUFPTR
	ISZ	BUFPTR
	JMP I	PCH

PUTNAM,	0
	TAD I	PUTNAM
	ISZ	PUTNAM
	DCA	NAMPTR
	TAD	(-3
	DCA 	NAMCNT
NAMLP,	TAD I	NAMPTR
	RTR
	RTR
	RTR
	JMS	P6CH	/PRINT LEFT 6 BITS
	TAD I	NAMPTR
	JMS	P6CH	/PRINT RIGNT 6 BITS
	ISZ	NAMPTR
	ISZ	NAMCNT
	JMP	NAMLP	/LOOP IF MORE
	JMP I	PUTNAM	/FORCE EXIT
P6CH,	0
	AND	(77
	SNA
	JMP I	PUTNAM	/RETURN OF ENCOUNTER NULLS
	TAD	(240	/EXPAND TO 7BIT
	AND	(77
	TAD	(240
	JMS	PCH	/SEND IT
	JMP I	P6CH
NAMPTR,	0
NAMCNT,	0
BUFPTR,	0

	PAGE