;ALTERNATE PDP-10 MNEMONICS.

	DEFINE O(A,B){OPDEF A[B]}
	O LIP,HLR↔O LAP,HRR↔O DIP,HRLM↔O DAP,HRRM
	O ZIP,HRRZS↔O ZAP,HLLZS↔O WIP,HRROS↔O WAP,HRRZS
	O CAR,HLRZ↔O LIPI,HRLI↔O LAPI,HRRI↔O DIPZ,HRLZM
	O CDR,HRRZ↔O LACI,MOVEI↔O SLACI,MOVSI↔O DAPZ,HRRZM
	O LAC,MOVE↔O LACN,MOVN↔O LACM,MOVM↔O SLAC,MOVS
	O DAC,MOVEM↔O DACN,MOVNM↔O DACM,MOVMM↔O SDAC,MOVSM
	O NIP,HLRE↔O NAP,HRRE↔O NIM,HRREI↔O GO,JRST
	O DZM,SETZM↔O DOM,SETOM
	O FLOAT,FSC 233↔O FLO,FSC 225↔O FIXX,FIX 233000

;SAIL LIKE SUBROUTINE LINKAGE.

	↓P←←17
	DEFINE SUBR(NAME){HALT .↔XWD 777077,[SIXBIT|NAME|]↔INTERN NAME↔↓NAME: ;}
	DEFINE CALL(NAME,X1,X2,X3,X4){
	IFDIF<><X1>{PUSH 17,X1↔IFDIF<><X2>{PUSH 17,X2
	IFDIF<><X3>{PUSH 17,X3↔IFDIF<><X4>{PUSH 17,X4}}}}
	IFDIF<><NAME>{PUSHJ 17,NAME}}
	DEFINE ARG1<-1(17)>↔DEFINE ARG2<-2(17)>
	DEFINE ARG3<-3(17)>↔DEFINE ARG4<-4(17)>
	DEFINE SETQ(VAR,LIST){CALL(LIST)↔DAC 1,VAR}

;RETURN FROM AN N-ARGUMENT SUBROUTINE CALL.

	DEFINE POP0J <POPJ 17,>
	↓POP1J.:SUB 17,[2(2)]↔GO@2(17)↔DEFINE POP1J<GO POP1J.>
	↓POP2J.:SUB 17,[3(3)]↔GO@3(17)↔DEFINE POP2J<GO POP2J.>
	↓POP3J.:SUB 17,[4(4)]↔GO@4(17)↔DEFINE POP3J<GO POP3J.>
	↓POP4J.:SUB 17,[5(5)]↔GO@5(17)↔DEFINE POP4J<GO POP4J.>

;ACCUMULATOR AND TEMPORARY DATA MANAGEMENT.

	FOR @$ I←0,17{↓AC$I:0↔}
	DEFINE SAVAC $(N){LAC[XWD 2,AC2]↔BLT AC$N}
	DEFINE GETAC (N){LAC[XWD AC2,2]↔BLT N}
	DEFINE ACCUMULATORS(LIST){ACPTR←←2
	FOR AC⊂(LIST)<AC←ACPTR↔ACPTR←←ACPTR+1↔>}
	DEFINE DECLARE (LIST){
	FOR VARNAM⊂(LIST)<VARNAM: 0↔>}

;FATAL ERROR MESSAGE.

COMMENT |
	DEFINE FATAL(STR){JSR FATAL.↔JFCL[ASCIZ/STR/]}
	FATAL.:0↔OUTSTR[BYTE(7)15,12(21)"FAT"↔"AL - "⊗1↔0]
	CDR@FATAL.↔OUTSTR@↔INCHRW↔GO .-1↔LIT
|;
	EXTERNAL FATAL.
	DEFINE FATAL(STR){PUSHJ P,FATAL.↔JFCL[ASCIZ|STR|]}

	DEFINE CRLF{OUTSTR[BYTE(7)15,12]}