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Trailing-Edge - PDP-10 Archives - bb-bt99g-bb - msgser.c09
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 INS 26/9	;09C1
		MOVEI	T1,DVDIBP	;BATCH PTY (ALSO DISABLE MESSAGE REASSEMBLY)
		ANDCAM	T1,DEVCHR(P3)	;CLEAR IT FIRST
		TDNE	T1,DEVCHR(P2)	;CHECK MPX
		IORM	T1,DEVCHR(P3)	;PROPAGATE STATE TO TARGET
 SUM 145856