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 REP 4/3	;09C1
	ND	TTIBRK,^D132		;MAX CHARS BEFORE BREAK CONDITION
	ND	TTIWRN,TTIBRK+^D40	;MAX CHARS BEFORE WE SEND AN XOFF
	ND	TTIMAX,^D300		;MAX CHARS BEFORE WE START TO SSIN??
 WIT

	;TERMINAL CHARACTER BUFFERING PARAMETERS

	ND	TTYMIC,^D60		;MAX CHARS BUFFERED IN DN8X
					;  (SHOULD MATCH "TTYMIC" IN DN8X CODE)

	;  ASCII & IMAGE MODES

	ND	TTIBRK,^D132		;MAX CHARS BEFORE BREAK CONDITION
	ND	TTIWRN,^D200		;MAX CHARS BEFORE WE SEND AN XOFF
	ND	TTIMAX,TTIWRN+<5*TTYMIC>;MAX CHARS BEFORE WE START TO DISCARD

	;  PIM MODE

	ND	TTPBRK,^D132		;MAX CHARS BEFORE WAKEUP (PIM MODE)
	ND	TTPWRN,^D500		;MAX CHARS BEFORE XOFF (PIM MODE)
	ND	TTPMAX,TTPWRN+<5*TTYMIC>;MAX CHARS BEFORE DISCARD (PIM MODE)

 DEL 10/3	;09C2
	;SIZE OF CHUNKS

 REP 16/53	;09C3
		CAMG	T2,RPIMWN	;TIME TO WARN HIM?
		JRST	REPIM2		;NO, NOT YET
		SUBI	T2,^D20		;IS HE OVER 20 CHARS?
		CAMLE	T2,RPIMWN	;OVER CURRENT LIMIT?
		JRST	[MOVE	T1,LDBPAG(U)
			 TLNN	T1,LPLXOF	;SENT XOF YET?
			 JRST	RPIM25		;NO, DO IT NOW
			 JRST	RCHLT1]		;YES, EAT CHAR
	RPIM25:	PUSHJ	P,SNDXOF	;SEND XOFF
		PUSHJ	P,RCVWAK
	REPIM2:	SKIPG	TTFREN##	;ROOM IN CHUNK SPACE?
		JRST	RCHLT2		;NO, SHUT IT DOWN
 WIT
		CAILE	T2,TTPWRN	;TIME TO WARN HIM?
		JRST	[CAILE	T2,TTPMAX	;YES, OVER CURRENT LIMIT?
			JRST	RCHLT1		;YES, PIM LIMIT EXCEEDED, EAT CHAR
			PUSHJ	P,SNDXOF	;NO, STILL HOPE, SEND XOFF
			PUSHJ	P,RCVWAK	;AND GET USER'S ATTENTION
			JRST	REPIM2]		;ACCEPT THIS CHARACTER
	REPIM2:	SKIPG	TTFREN##	;ROOM IN CHUNK SPACE?
		JRST	RCHLT1		;NO, SHUT IT DOWN
 REP 31/53	;09C4
		AOS	LDBTIC(U)	;INCREMENT COUNT
 WIT
		AOS	T1,LDBTIC(U)	;INCREMENT COUNT
 INS 36/53	;09C5
		CAIE	T1,TTPBRK	;TIME FOR A WAKEUP ON G.P.S?
 REP 2/54	;09C6
		TDNE	T1,LDBPAG(U)	;HAVE WE SENT ONE?
		POPJ	P,		;IF SO, DON'T SEND TWO
		IORM	T1,LDBPAG(U)	;SET THE BIT SO WE DON'T SEND ANOTHER
 WIT
		TDNN	T1,LDBPAG(U)	;HAVE WE SENT ONE?
		JRST	SNDXF2		;NO, ALWAYS SEND THE FIRST XOFF
		MOVE	T1,LDBTIC(U)	;INPUT CHARACTER COUNT
		ADD	T1,LDBECC(U)	;PLUS THOSE NOT-QUITE-FULLY-INPUT
		TRNE	T1,<-1_-<^L<TTYMIC>>>  ;ROUGHLY-MODULO TTYMIC?
		POPJ	P,		;NO, DON'T SEND GOBS OF XOFFS
		MOVSI	T1,LPLXOF	;YES, SEND ANOTHER XOFF
					; (IN CASE THE UGLY RACE BIT US THE FIRST
					;  TIME AND THE PREVIOUS XOFF GOT LOST -
					;  SUCH ARE THE VAGARIES OF REALITY)
	SNDXF2:	IORM	T1,LDBPAG(U)	;SET THE BIT SO WE DON'T SEND TOO MANY
 REP 32/84	;09C7
		CAIGE	T1,^D80
		MOVEI	T1,^D80
		EXCH	T1,TIWRNN	;STORE NEW LIMIT AND GET PREVIOUS
		MOVEM	T1,TIWRN1	;STORE PREVIOUS
		MOVE	T1,TIWRNN	;GET NEW BACK
		CAIGE	T1,^D600	;IF IT ISN'T AT LEAST 600
		MOVEI	T1,^D600	; THEN MAKE IT 600
		MOVEM	T1,RPIMWN	;AND SAVE
 WIT
		CAIGE	T1,TTIBRK
		MOVEI	T1,TTIBRK
		MOVEM	T1,TIWRNN	;STORE NEW LIMIT
 REP 39/125	;09C8
		 JRST	TOPXF2		;NO
 WIT
		 JRST	CPOPJ1##	;NO
 INS 56/125	;09C9
		PUSHJ	P,SETCHP	;MAKE SURE THE FRONT END KNOWS ABOUT THE CHANGE
 REP 17/207	;09C10
	RPIMWN::EXP	^D600		;(5)  PIM BUFFER SIZE
 WIT
		EXP	TTPWRN		;(5)  PIM BUFFER SIZE (BEFORE XOFF)
 SUM 60832