;;;MODIFICATION HISTORY
;;;
;;; 15 NOV 75  OBTAINED FROM DEC (KLDCP REV 7)
;;; 15 NOV 75  CONVERTED TO PALX FORMAT
;;;

.SBTTL	APT10 PDP-11 PROCESS, 13-AUG-75

ACTFIL:	CMP #5,LDCNTL		;LOADING ".BIN" ?
	BNE 1$
	MOV #1,LDCNTL		;YES, ACT10 CONVERTS TO ".A11"
1$:	COMENQ 			;REQUEST APT10 SERVICE
	MOV #$INBUF,R0
	COMCMD 			;SEND COMMAND TO REMOTE
	BCS 2$			;C-BIT SET, FILE NOT FOUND
	CLR ARETRY		;CLEAR RETRY COUNTER
	BR ACTLD1		;GO TO LOAD PROCESS
2$:	JMP $NONXF

ACTLD2:	TST DEVTYP
	BMI 1$			;ACT10
	JMP LLD2		;DECTAPE/RP04
1$:	COMACK 			;ACK PREVIOUS LINE
	BCS ACTEOF		;C-BIT SET, EOF
	CLR ARETRY		;CLEAR RETRY COUNTER

ACTLD1:	INC DEVLC		;COUNT LINE
	MOV DEVLC,SWR		;DISPLAY
	TST LDCNTL		;DOING A "HELP" ?
	BPL 1$			;NO
DAHLP=.
	TST DIAFLG		;DOING DIAMON
	BEQ 30$			;NO
	TST DEVLC		;YES, FIRST LINE ?
	BNE 31$			;NO
	JMP DIAFND		;YES, DIAMON FILE FOUND
31$:	JMP DIARNL		;DIAMON READ NEW LINE
30$:	TST IFILEF		;DOING AN INDIRECT FILE ?
	BEQ 4$
	JMP IFILEP		;YES, STORE INPUT
4$:	SETFLG
	HLPPNT 			;NORMAL BACKSLASHES
	MOV #$INBUF,R0		;YES, PRINT INPUT LINE
	TST DEVTYP
	BPL 41$
	MOV #CINBF,R0
41$:	PNTAL
	CLR HLPPNT
	BR ACTLD2		;REPEAT TILL "EOT"

1$:	JMP LDPROC		;GO TO LOAD PROCESS

ACTEOF:	COMCLR

DAHLPD=.
	TST DIAFLG		;DOING DIAMON ?
	BEQ 10$			;NO
	JMP DIAEOF		;YES, SEND DIAMON END OF FILE
10$:	TST IFILEF		;INDIRECT/DOUBLE INDIRECT ?
	BNE 21$			;YES
	PCRLF 			;NO, JUST HELP
	BR 23$			;BACK TO CONSOLE

21$:	TST JFILEF		;DOUBLE INDIRECT ?
	BPL 22$			;NO
	TSTB JFILEF		;PRESENT JUST INDIRECT ?
	BEQ 22$			;YES
	CLRB JFILEF		;SET DONE WITH READING "J"
	MOV #TOUTBF+5000,JFINP	;SET "J" POINTER TO BEGINNING
	JMP CONSL		;START RUNNING

22$:	MOV #TOUTBF,IFINP	;SET POINTER TO BEGINNING
	CLRB IFILEF
23$:	JMP $CONSL		;GO PROCESS INDIRECT FILE

ACTDON:	COMACK 			;ACK TRANSFER BLOCK
	BCC 3$
DADONE=.
	TST SRTFLG		;SELF START ?
	BEQ 1$
	JMP $$GO		;YES
1$:	JMP $CONSL		;NO

3$:	PMSG <?EOF,ERR>
$$C2:	JMP $CNTLC

ACTLDC:	PMSG <?LOAD CHR>
	BR ACTERR

ACTBCK:	PMSG <?CKSUM>
	BR ACTERR

ACTLDF:	PMSG <?FORMAT>

ACTERR:	PMSG < ERR: LOAD LINE >
	MOV DEVLC,R0
	PNTDEC 			;PRINT LOAD LINE NUMBER
	PCRLF
	TST DEVTYP
	BPL 2$			;DECTAPE/RP04
	INC ARETRY
	CMP #4,ARETRY		;REACHED RETRY LIMIT ?
	BEQ 1$			;YES
	COMNAK 			;NO, NAK MESSAGE & TRY AGAIN
	DEC DEVLC		;DECREMENT LINE COUNT
	JMP ACTLD1

1$:	PMSG <CAN'T LOAD>
2$:	BR $$C2

.SBTTL	COMMUNICATIONS ROUTINES

$COMACK:INC MSGNBR		;COUNT MESSAGE
$$CMACK:MOV #ACKMSG,R5		;MESSAGE ACKNOWLEDGE
	BR $COMCX

$COMNAK:MOV #NAKMSG,R5		;MESSAGE NEGATIVE ACKNOWLEDGE
	BR $COMCX

$COMCMD:CLR R5			;MESSAGE COMMAND

$COMCX:	MOV #3,R4		;RETRY 3 TIMES

1$:	TST R5
	BNE 2$

	COMSND 			;COMMAND SEND
	BR 3$

2$:	MOV R5,R0
	COMCTL 			;CONTROL SEQUENCE SEND

3$:	COMLIN 			;GET REPLY
	BCS 5$			;ERROR
	BPL 7$			;CONTROL SEQUENCE

	MOV #136,R3		;NORMAL MESSAGE
	BIT #1,MSGNBR		;ODD OR EVEN MESSAGE NUMBER
	BEQ 4$
	MOV #041,R3
4$:	CMP R3,COMNBR		;CORRECT MESSAGE NUMBER ?
	BNE $$CMACK		;NO, MUST BE REPEAT
	CLR R0
41$:	EXIT 			;NEW MESSAGE READY FOR PROCESS

5$:	DEC R4			;EXCEEDED RETRY LIMIT ?
	BNE 6$			;NO, TRY AGAIN
	JMP $COMERR		;YES, REPORT ERROR & ABORT

6$:	TST R5
	BNE 61$			;CONTROL REPEAT
	CMP #-5,R0		;RECIEVED CHECKSUM ERROR ?
	BEQ 61$			;YES, SEND NAK
	COMRTRY 		;COMMAND RETRY
	BR 3$

61$:	MOV #NAKMSG,R5
	BR 2$

7$:	TTICHR 			;GET CONTROL SEQUENCE CHARACTER
	CMPB #'A,R0
	BEQ 41$			;A, ACKNOWLEDGE
	CMPB #'Z,R0
	BEQ 8$			;Z, END OF TRANSMISSION
	CMPB #'N,R0
	BNE 71$
	MOV #-7,R0		;N, NEGATIVE ACKNOWLEDGE
	BR 5$

71$:	MOV #-10,R0		;UNKNOWN RESPONSE
	BR 5$

8$:	EXITERR 		;END OF FILE

$COMERR:PUSH R0
	PMSG <?COMM ERR >
	POP R0
	NEG R0
	MOV R0,R1
	PNTOCS
	PNTCI
	", 
	DEC R1
	SL R1,1
	MOV CMERTB(R1),R0
	PNTAL
	JMP $CNTLC

CMERTB:	CMER1
	CMER2
	CMER3
	CMER4
	CMER5
	CMER6
	CMER7
	CMER10

CMER1:	.ASCIZ %NO RESPONSE%
CMER2:	.ASCIZ %LONG LINE%
CMER3:	.ASCIZ %MSG NBR%
CMER4:	.ASCIZ %NO CR%
CMER5:	.ASCIZ %MSG CKSUM%
CMER6:	.ASCIZ %FORMAT%
CMER7:	.ASCIZ %NAK%
CMER10:	.ASCIZ %UNKNOWN%
.EVEN

$COMSND:MOV #COUTBF,R5
	CLR R3

1$:	CMPB (R0),#CR		;REACHED CR YET ?
	BEQ 2$			;YES
	CMPB (R0),#ALTMOD	;OR ALTMODE ?
	BEQ 12$			;YES, SUBSTITUTE CR

	TSTB (R0)		;REACHED NULL BYTE ?
	BNE 11$
	MOV #-6,R0		;YES, INCORRECT MESSAGE FORMAT
	BR $COMERR

11$:	MOVB (R0),R2
	ADD R2,R3		;ACCUMULATE CHECKSUM
	MOVB (R0)+,(R5)+	;TRANSFER MSG TO OUTPUT BUFFER
	BR 1$

12$:	MOV #ALTMOD,(R5)+
	BR 22$
2$:	MOVB (R0)+,(R5)+	;PUT CR IN OUTPUT
22$:	CLRB (R5)		;FOLLOW WITH NULL

	MOV #COUTBF-4,R5	;SETUP MESSAGE START
	MOVB #136,(R5)
	BIT #1,MSGNBR		;SET UP MESSAGE NUMBER CHAR
	BEQ 21$
	MOVB #041,(R5)
21$:	INC R5

	NEG R3			;NEGATE CHECKSUM

	MOV R3,R0
	SWAB R0
	BIC #177400,R0
	SHIFTR
	  4
	JSR PC,COMASC
	MOVB R0,(R5)+		;INSERT 1ST CHECK CHAR

	MOV R3,R0
	SHIFTR
	  6
	JSR PC,COMASC
	MOVB R0,(R5)+		;INSERT 2ND CHECK CHAR

	MOV R3,R0
	JSR PC,COMASC
	MOVB R0,(R5)+		;INSERT 3RD CHECK CHAR

$CMRTRY:MOV #COUTBF-4,R0	;SETUP MESSAGE POINTER

$COMCTL:TSTB @$CMTKS		;ANY OLD CHARS ?
	BPL 1$
	MOVB @$CMTKB,$TTYIN	;YES, GET GET OF IT
	BR $COMCTL

1$:	TSTB @$CMTPS		;WAIT TILL OUTPUT IS READY
	BPL $COMCTL

	MOV #2,R1		;SEND 2 SYNC CHARACTERS
2$:	MOVB #SYN,@$CMTPB
3$:	TSTB @$CMTPS
	BPL 3$
	DEC R1
	BNE 2$

4$:	MOVB (R0)+,R1		;GET MESSAGE CHAR
	BEQ 6$			;IF NULL, DONE

	MOVB R1,@$CMTPB		;SEND CHAR
5$:	TSTB @$CMTPS		;WAIT TILL OUTPUT READY
	BPL 5$
	BR 4$			;SEND TILL NULL

6$:	EXIT 			;COMPLETED

COMASC:	BIC #177700,R0		;KEEP 6 BITS
	CMP R0,#74		;LEAVE 75,76,77 ALONE
	BGT 1$
	BIS #100,R0		;SET BIT 7 FOR ASCIIZE
1$:	RTS PC

$COMLIN:MOV #CINBF-4,R1		;START BUFFER ADDRESS
	CLR $TTYTIM		;CLEAR TIMEOUT
	CLR R5			;CLEAR IN SYNC FLAG

1$:	JSR PC,C10COP		;PERFORM CLOCK OPERATIONS
	CMP $TTYTIM,#<20.*60.>	;20 SECS
	BGT 90$			;TIMED OUT

	TSTB @$CMTKS		;COMM IN FLAG SET ?
	BMI 2$			;YES

	JSR PC,$PTTYC		;ANY OPERATOR INTERRUPT ?
	BR 1$			;NO

2$:	MOVB @$CMTKB,(R1)	;MOVE CHAR TO BUFFER
	BICB #200,(R1)
	TSTB (R1)
	BEQ 1$			;IGNORE NULLS

	CMPB (R1),#SYN		;SYNC CHAR ?
	BEQ 21$			;YES

	TST R5			;RECIEVED SYNC YET ?
	BEQ 1$			;NO, DUMP GARBAGE CHARS

	CMPB (R1),#ALTMOD
	BEQ 3$			;ALTMODE, CONTROL SEQUENCE

	CMPB (R1),#'$		;DOLLAR, PDP-10 SENDS THIS FOR ALTMODE
	BNE 22$
	CMP R1,#CINBF		;LEGAL ONLY IF IN CONTROL SEQUENCE
	BLT 3$

22$:	CMPB (R1),#LF
	BEQ 4$			;LF, MESSAGE SEGMENT

	INC R1
	CMP R1,#CINBF+140.
	BLE 1$			;STILL ROOM
	BR 91$			;NO, LINE TOO LONG

21$:	MOV #-1,R5		;SYNC, SET IN SYNC FLAG
	BR 1$

3$:	INC R1			;NULL TO END BUFFER
	CLRB (R1)
	MOV R1,$INPTR		;SETUP INPUT POINTERS
	MOV #CINBF-4,$INPTC
	EXIT 			;CONTROL SEQUENCE RETURN

4$:	INC R1
	CLRB (R1)
	MOV R1,$INPTR		;SETUP INPUT POINTERS
	MOV #CINBF-4,R1
	CMPB #041,(R1)
	BEQ 41$
	CMPB #136,(R1)
	BEQ 41$
	BR 92$			;MESSAGE NUMBER INCORRECT

41$:	MOVB (R1)+,COMNBR	;SAVE MESSAGE NUMBER
	CLR R0			;SETUP FOR MESSAGE CHECKSUM
	MOV #3,R5		;CHARS 2,3,4 ARE CHECKSUM

42$:	SL R0,6
	MOVB (R1)+,R4		;GET 1ST CHECK CHAR
	BIC #100,R4		;CLEAR ASCIIZE BIT
	BIS R4,R0		;INSERT IN 16 BIT CHECKSUM
	DEC R5
	BGT 42$			;DO 3 CHARS

43$:	CMPB (R1),#CR		;REACHED EOL ?
	BEQ 44$			;YES
	TSTB (R1)		;PAST EOL WITHOUT CR ?
	BEQ 93$			;YES, NO CR ERROR

	MOVB (R1)+,R3
	ADD R3,R0		;ACCUMULATE CHECKSUM
	BR 43$

44$:	TST R0			;DID CHECKSUM COMPUTE TO 0 ?
	BNE 94$			;NO, CHECKSUM ERROR

	MOV #CINBF,$INPTC	;MESSAGE SEGMENT OK
	BIS #NBIT,14(SP)	;SET NORMAL MESSAGE INDICATOR
	EXIT

90$:	MOV #-1,R0		;NO RESPONSE ERROR
	BR 99$

91$:	MOV #-2,R0		;LINE TOO LONG ERROR
	BR 99$

92$:	CMPB #'?,(R1)		;IS MESSAGE NUMBER QUESTION MARK ?
	BEQ COMQ		;YES, HOST ERROR
	MOV #-3,R0		;MESSAGE NUMBER CHAR ERROR
	BR 99$

93$:	MOV #-4,R0		;NO CARRIAGE RETURN ERROR
	BR 99$

94$:	MOV #-5,R0		;MESSAGE CHECKSUM ERROR

99$:	EXITERR 		;ERROR EXIT, C-BIT SET, CODE IN R0

COMQ:	$PMSG 			;PRINT ERROR REPLY
	 CINBF-4
	JMP $CNTLC

$COMENQ:COMCLR 			;CLEAR COMMUNICATIONS
	SETFLG
	  ENQFLG		;SET APT10 IN PROGRESS
	MOV #3,R4
10$:	CLR MSGNBR		;INITIALIZE MESSAGE NUMBER
	MOV #ENQMSG,R0
	COMCTL 			;SEND "ENQ" MESSAGE

	COMLIN 			;WAIT FOR REPLY
	BCS 1$			;ERROR, CODE IN R0
	BMI 3$			;NORMAL MESSAGE REPLY ?
	TTICHR
	CMPB #'A,R0		;A, ACKNOWLEDGE
	BNE 1$
	EXIT 			;ACKED, GO AHEAD

1$:	TST R0			;IS REPLY CODE NEGATIVE ?
	BMI 4$			;YES, COMLIN ERROR

	CMPB #'Z,R0		;IS REPLY EOT, WAIT ?
	BNE 3$			;NO

	CLR $TTYTIM		;YES, WAIT 10 SECONDS
2$:	JSR PC,$PTTYC
	JSR PC,C10COP
	CMP $TTYTIM,#<10.*60.>
	BLE 2$
	BR $COMENQ		;THEN TRY AGAIN

3$:	PMSG <?APT10 ENQ>
	JMP $CNTLC

4$:	DEC R4
	BNE 10$			;RETRY
	JMP $COMERR		;COMMUNICATIONS ERROR

$COMEOT:MOV #EOTMSG,R0
	COMCTL
	EXIT

$COMCLR:CLR ENQFLG
	MOV #CANMSG,R0
	COMCTL
	MOV #100000,R1
1$:	TSTB @$CMTKS		;ANY INPUT IN PROGRESS ?
	BPL 2$
	MOVB @$CMTKB,R0		;IF SO, GET RID OF IT
	BR 1$
2$:	DEC R1
	BNE 1$			;A LITTLE DELAY
	EXIT

ENQMSG:	.BYTE 'E,33,0
ACKMSG:	.BYTE 'A,33,0
NAKMSG:	.BYTE 'N,33,0
CANMSG:	.BYTE 'C,33,0
EOTMSG:	.BYTE 'Z,33,0

	.EVEN

IFILEP:	MOV #$INBUF,R0		;SETUP POINTERS
	TST DEVTYP
	BPL 10$
	MOV #CINBF,R0
10$:	MOV IFINP,R1
1$:	MOVB (R0)+,(R1)+	;TRANSFER CHARS TO STORAGE
	BNE 1$			;TILL NULL
	CLRB (R1)		;THEN STORE 2ND NULL
	MOV R1,IFINP		;RESAVE POINTER
	CMP R1,#TOUTBF+10000-200
	BLE 2$			;EXCEEDED BUFFER ROOM ?
	JMP $LINERR		;YES
2$:	JMP ACTLD2		;REPEAT TILL EOF