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Assembly Source File | 1984-04-29 | 25KB | 648 lines

; CP/M FILE LISTING FACILITY, INCUDING ; AUTOMATIC PRINTING OF TIME AND DATE ; USING COMPU/TIME T-102 CLOCK BOARD ; ; ver. 1.1.A 12/02/79 - HARRY KAEMMERER ; TEL. NY TIME 201-221-2297 ; ; BASED ON VER. 1.1 4/17/79 BY DENNIS THOVSON ; ; Based on ver. 2.0 of IMSAI's IMDOS ; File List Facility ; ; FCB FOR FILE MUST BE SET UP BEFORE ENTRY ; i.e. "TLIST FILENAME.TYP" Command ; DO NOT ENTER AMBIGUOUS (? or *) FILENAME ; OR TYPE ; ; Default Title is FILENAME.TYP + ; any additional information (up to 48 ; characters) appended to the entry command. ; ; Optional Title and Subtitle may be ; entered after Entry Command is executed. ; PGSIZ EQU 65 ;NO. OF LINES PER PAGE PPPAGE EQU 60 ;NO. OF LINES TO PRINT PER PAGE PNOCOL EQU 64 ;COLUMN "PAGE" AND NUMBER RESET EQU 0CH ;FF CLEARS SCREEN ON MY CONSOLE ;SYSTEM CALL FUNCTION NUMBERS CLK EQU 0C0H ;MY CLOCK BOARD ADDRESS PORT CONIN EQU 1 ;CONSOLE INPUT CHAR CONOUT EQU 2 ;CONSOLE OUTPUT CHAR (E) CONRDY EQU 11 ;CONSOLE CHARACTER READY TEST BUFFRD EQU 10 ;BUFFERED READ COMMAND PRINT EQU 9 ;PRINT STRING (DE) TO $ LIST EQU 5 ;OUT CHAR (E) TO LST: DEVICE OPEN EQU 15 ;OPEN FILE CONTROL BLOCK READ EQU 20 ;READ NEXT SEQUENTIAL RECORD BDOS EQU 05H ;SYSTEM CALL ENTRY POINT FCB EQU 5CH ;DEFAULT FILE CONTROL BLOCK NR EQU FCB+32 ;NEXT RECORD TO READ TBUFF EQU 80H ;WHERE CCP PUTS COMMAND LINE DEFBUF EQU 80H ;WHERE SECTORS ARE READ TBASE EQU 100H ;TRANSIENT PROGRAM BASE ;EQUATES FOR ASCII CONTROL CHARACTERS TAB EQU 9 ;CONTROL I (HT) TAB. LF EQU 0AH ;LINE FEED FF EQU 0CH ;FORM FEED ALTFF EQU 0BH ;CONTROL K (VT) ALSO CAUSES FF CR EQU 0DH ;CARRIAGE RETURN CTRLZ EQU 1AH ;CONTROL Z. EOF. ; ; ORG TBASE ;ENTRY POINT ; TLIST: JMP LISTGO ;NORMAL ENTRY LXI SP,DSTACK ;DDT DEBUGGING ENTRY CALL LISTGO ;USE "I" COM'D TO SET FILE NAME RST 7 ;RETURN TO DDT ; ;MAIN PROGRAM BEGINS HERE LISTGO: LXI H,0 ; DAD SP ; SHLD CALRSP ; LXI SP,STACK ; ; ;SIGN-ON MESSAGES ; LXI D,CMSG1 ;MESSAGE 1 TO CONSLOLE CALL PCOMSG ; ;PRINT DEFAULT TITLE ON CONSOLE LXI H,TBUFF ;GET DEFAULT TITLE MOV B,M ;HOW MANY CHARACTERS TLTOUT: DCR B ; JM TLTEND ; INX H ; MOV A,M ; CALL CONO ;PRINT TITLE ON CONSOLE JNZ TLTOUT ;DO IT ALL TLTEND: LXI D,CMSG2 ;CONSOLE MESSAGE 2 CALL PCOMSG ; MVI C,CONIN ;GET CHAR. FROM CONSOLE CALL BDOS ; CPI CR ;IS IT A CR ? JNZ LTE1 ; CALL TITL1 ;DEFAULT TITLE JMP NSTEND ; LTE1: CPI 'Y' ;IS IT A YES ? JNZ TLTEND ;ASK AGAIN IF NOT LXI D,CMSG4 ;CONSOLE MESSAGE 4 CALL PCOMSG ; ;GET NEW TITLE LXI D,RDBUFF ; MVI A,60 ;LENGTH OF TITLE STAX D ; MVI C,BUFFRD ; CALL BDOS ;GET NEW TITLE LXI H,RDBUFF+1 ;SEE IF ANY CHARS. MOV A,M ; CPI 0 ; JNZ NBE1 ; CALL TITL1 ;DEFAULT TITLE JMP NTEND ; NBE1: LXI D,TTLBUF ;MOVE NEW TITLE TO MOV C,A ;BUFFER MVI B,60 ; CALL TITLUP ;DO IT NTEND: ; NSTBEG: LXI D,CMSG6 ;CONSOLE MESSAGE 6 CALL PCOMSG ; LXI H,STLBUF ;SUBTITLE OUTPUT BUFFER POINTER SHLD SBTPNT ; XRA A ; STA SUBTF ;SET SUBTITLE FLAG TO 0 GSBTL: LXI D,RDBUFF ;BUFFERED READ THRU CP/M MVI A,80 ; STAX D ; MVI C,BUFFRD ; CALL BDOS ; LXI H,RDBUFF ; LDA RDBUFF+1 ;NO. OF CHARS. THIS LINE CPI 0 ;SEE IF ANY CHARS. JZ NSTEND ;NO, IGNORE SUBTITLE INR A ; MVI D,0 ; MOV E,A ; DAD D ;ADDRESS OF LAST CHAR. MOV A,M ; CPI 1AH ;IS IT A CONTROL Z ? JZ GSB1 ;YES, MORE TO DO INX H ;ADD 0 TO END MVI M,0 ;END OF SUBTITLE CALL SASBTL ;PUT LINE IN BUFFER MVI A,0FFH ; STA SUBTF ;SET FLAG JMP NSTEND ;ALL DONE GSB1: MVI M,0DH ;CR, OVERWRITE CONTROL Z INX H ; MVI M,0AH ;LF CALL SASBTL ;PUT LINE IN BUFFER MVI A,LF ; CALL CONO ;SEND A LF TO CONSOLE JMP GSBTL ;GET NEXT LINE SASBTL: LHLD SBTPNT ;WHERE SUBTITLE GOES XCHG ; LXI H,RDBUFF+1 ;NO. OF CHARS IN LINE MOV B,M ; INR B ;ADD 1 FOR LF OR 0 SAS1: INX H ;MOVE LINE TO BUFFER MOV A,M ; STAX D ; INX D ; DCR B ; JNZ SAS1 ; XCHG ; SHLD SBTPNT ;SAVE SUBTITLE BUFF. PTR. RET ; ; NSTEND: LXI D,CMSG7 ;CONSOLE MESSAGE 7 CALL PCOMSG ; MVI C,CONIN ; CALL BDOS ; CPI CR ; JNZ NSTEND ; JMP TITL9 ; ;SET UP DEFAULT TITLE. TITLE CONSISTS OF FILE ;NAME AND ANYTHING USER TYPES AFTER IT. TITL1: LXI H,TTLBUF ;WHERE TO PUT TEXT XCHG ; LXI H,TBUFF ;WHERE CCP LEFT TEXT MOV C,M ;NUMBER OF CHARS IN TBUFF INX H ;DISCARD LEADING ' ' DCR C ; MVI B,60 ;MAX # CHARS TO USE CALL TITLUP ; RET ; ;COPY TEXT TITLUP: DCR C ; JM TITL2 ;STOP IF INPUT USED UP INX H ; MOV A,M ; STAX D ; INX D ;MOVE 1 CHARACTER DCR B ; JNZ TITLUP ;STOP AT MAX # CHARS ;TERMINATE WITH 0 TITL2: XRA A ; STAX D ; RET ; ;MAKE SURE NO ?'S IN FILE NAME: IF AFN IS GIVEN ;DIRECTORY ENTRIES GET CHANGED TO ?'S ON AUTOMATIC ;CLOSES ON GOING TO NEXT EXTENT, AND SUCCESSIVE ;EXTENTS ARE NOT NECESSARILY OF THE SAME FILE. ;CCP TRANSLATES *'S TO MULTIPLE ?'S. TITL9: LXI H,FCB ;WHERE NAME IS MVI C,11 ;NUMBER OF CHARS LXI D,EMQUES ;MESSAGE TO USE IF ? FOUND QLUP: INX H ;POINT NEXT CHARACTER MOV A,M ;GET CHARACTER CPI '?' ; JZ TERM ;JMP IF ? DCR C ;COUNT CHARACTERS TO TEST JNZ QLUP ;LOOP BACK UNLESS DONE ;OPEN FILE MVI C,OPEN ; LXI D,FCB ; CALL BDOS ;CALL SYSTEM CPI 255 ; LXI D,EMFNF ;MESSAGE IF ERROR JZ TERM ;IF NOT FOUND, ERROR EXIT XRA A ; STA NR ;SAY START AT RECORD 0 STA ICOUNT ;SAY EMPTY INPUT BUFFER ;INITIALIZE OUTPUT XRA A ; STA COL ; STA LINE ;INIT CURSOR POSITION STA PAGE+1 ; INR A ; STA PAGE ;.. PAGE STARTS AT DW 1 ;POSTION PAPER TO FIRST LINE BEFORE CALLING ;LIST. THE NEXT PROGRAM SEGMENT WILL SPACE ;DOWN TO THE 4th LINE AND PRINT TITLE ;(SUBTITLE) INFORMATION. MVI B,3 ;SEND 3 LINE FEEDS TOPPAG: PUSH B ; MVI A,LF ; CALL LOCH ; POP B ; DCR B ; XRA A ; CMP B ; JNZ TOPPAG ; ;PRINT TITLE AND SUBTITLE FOR FIRST PAGE CALL PTITL ; ;IGNORE ANY CR'S, LF'S, FORM FEEDS, ECT. ;AT BEGINNING OF FILE. CALL IGNORE ;IGNORE FF'S ETC. JMP CLOOP1 ;ENTER CHARACTER LOOP ;MAIN PROGRAM CONTROL LOOP STARTS HERE CLOOP: CALL INCH ;GET CHARACTER CLOOP1: PUSH B ; PUSH H ; CALL LSTCH ;PROCESS & LIST 1 CHAR ;CHECK CONSOLE STATUS MVI C,CONRDY ; CALL BDOS ; RAR ;TEST LSB CC CHKCON ;SEE WHAT CONSOLE WANTS POP H ; POP B ; JMP CLOOP ; ;CONSOLE CONTROL ROUTINE CHKCON: MVI C,CONIN ; CALL BDOS ;GET CHARACTER CPI 15H ;IS IT A CONTROL U ? JZ EOF ; CPI 13H ;IS IT A CONTROL S ? RNZ ;RETURN IF NOT CON1: MVI C,CONRDY ; CALL BDOS ; RAR ; JNC CON1 ;WAIT FOR CONSOLE MVI C,CONIN ; CALL BDOS ;WHAT IS IT ? CPI 13H ; RZ ;START LIST AGAIN CPI 15H ;WANT TO ABORT ? JZ EOF ;ABORT JMP CON1 ;WAIT FOR ANOTHER CHAR ;END OF FILE. FORM FEED AND EXIT. ;OUTPUT FF WITHOUT TITLE EOF: CALL LFFSUB ; ;EXIT ROUTINE EXIT: LHLD CALRSP ;ENTRY STACK POINTER SPHL ;RESET SP FOR CCP MVI A,0 ;SAY NO ERROR RET ; ;ERROR STUFF NSERR: LXI D,MERR ;MISCELLANEOUS ERRORS ;COME HERE WITH DE POINTING TO TEXT TERM: MVI C,PRINT ; CALL BDOS ; JMP EXIT ; ;READ NEW RECORD FROM OPEN FILE NEWREC: MVI C,READ ; LXI D,FCB ; CALL BDOS ;READ RECORD CPI 1 ; JZ EOF ;IF END OF FILE ORA A ; JNZ NSERR ;GOOD RETURN FROM BDOS ? LXI H,ICOUNT ; MVI M,128 ;INIT BUFFER COUNTER LXI H,DEFBUF ; SHLD IPOINT ;INIT BUFFFER POINTER POP H ; ;ENTRY POINT INCH: PUSH H ; LXI H,ICOUNT ; DCR M ;COUNT CHARS USED FROM RECORD JM NEWREC ;NEED ANOTHER RECORD LHLD IPOINT ;GET BUFFER POINTER MOV A,M ;FETCH CHARACTER CPI CTRLZ ; JZ EOF ;GO DIRECT TO EOF ROUTINE INX H ; SHLD IPOINT ;POINT NEXT POP H ; RET ; ;LIST CHAR IN A WITH PROCESSING OF SPECIAL CHARS ;KEEPS TRACK OF COLUMN, LINE, PAGE. ;EXPANDS TABS WITH STOPS EVERY 8 COLUMNS ;SIMULATES FORM FEEDS WITH LINE FEEDS. LSTCH: LXI H,COL ;INCREMENT COLUMN COUNTER INR M ; ;KILL PARITY BIT IN CHARS. FROM FILE. ;(NOTE: ELSE CERTAIN CHARS CAN PRODUCE ;INFINITE LOOP OF ^'S.) ANI 7FH ; ;SPACE OR GREATER ASCII CODE JUST GETS PRINTED CPI ' ' ; JP LOCH ;GO PRINT IT DCR M ;ELSE RESTORE COLUMN COUNTER ;PROCESS SPECIALS PUSH PSW ; CPI CR ; JNZ LSC2 ; XRA A ; STA COL ; POPLOC: POP PSW ;GET CHAR BACK JMP LOCH ;GO LIST IT LSC2: CPI LF ; JNZ LSC3 ; LDA LINE ; CPI PPPAGE-1 ; JP LISFF ;PAGE FULL, MAKE LIKE FF POP PSW ;CLEAR STACK AND PROCEED ;PROCESS AND PRINT LINE FEED LISLF: PUSH PSW ; MVI A,LF ; CALL LOCH ;OUTPUT LINE FEED LDA LINE ; INR A ;LINE+1 CPI PGSIZ ; JM LSC2A ;IF BOTTOM OF PAGE, MAKE IT.. XRA A ;..TOP OF NEXT PAGE. LHLD PAGE ; INX H ; SHLD PAGE ; LSC2A: STA LINE ; POP PSW ; RET ; ; LSC3: CPI ALTFF ; JZ LISFF ;ALTERNATE FORM FEED CPI FF ; JNZ LSC4 ; ;PRINT CR, LF'S TILL LINE=0 LISFF: CALL LFFSUB ;SIMULATE FORM FEED ;NEED A TITLE AT TOP OF NEXT PAGE, BUT FIRST SEE ;IF ANY MORE NON-CR, LF, FF CHARACTERS IN FILE. ;THUS IT AVOIDS BLANK SPACE AT TOP OF PAGE. CALL IGNORE ;PASS CR, FF, ETC ;IF HERE, NOT AT EOF AND NEXT CHAR IS IN A REG. CALL PTITL ;PRINT TITLE POP H ; JMP LSTCH ;CLEAR STACK, GO LIST CHAR LSC4: CPI TAB ; JNZ LSC5 ; ;PRINT SPACES TILL LO 3 BITS OF COL = 0 LSC4A: MVI A,' ' ; CALL LSTCH ; LDA COL ; ANI 7 ; JNZ LSC4A ; LPOPX: POP PSW ; RET ; ;ADD MISCELLANEOUS CHARACTERS HERE. ;PRINT ^ AND LETTER LSC5: MVI A,'^' ; CALL LSTCH ; POP PSW ; ORI 40H ; JMP LSTCH ; ;PROCESS AND OUTPUT (SIMULATED) FORM FEED LFFSUB: MVI A,CR ; CALL LSTCH ; LSFF2: LDA LINE ; ORA A ; CNZ LISLF ; JNZ LSFF2 ; RET ; ;SUBROUTINE TO IGNORE CR'S, LF'S, FORM FEEDS. ;CALLED AT TOP OF EACH PAGE. RETURNS NEXT NON- ;IGNORED CHAR. IN A. QUIT 'LIST' IF EOF FOUND. IGNORE: CALL INCH ;GET SOURCE FILE CHAR. IN A CPI CR ; JZ IGNORE ; CPI LF ; JZ IGNORE ; CPI FF ; JZ IGNORE ; CPI ALTFF ; JZ IGNORE ; RET ;CHARACTER IS IN A ;LIST OUTPUT CHAR IN A, WITHOUT PROCESSING LOCH: MOV E,A ; MVI C,LIST ; JMP BDOS ; ;SUBROUTINE TO PRINT PAGE TITLE PTITL: CALL CLOCK ;*** READ CLOCK AND PRINT IT ON TOP OF PAGE *** PUSH PSW ; PUSH H ; ;TITLE TEXT LDA TFLAG ; ORA A ; JZ NOTITL ; LXI H,TTLBUF ; CALL LSTRNG ; ;PAGE NUMBER NOTITL: LDA PNFLAG ; ORA A ; JZ NOPGNO ; ;SPACE TO COLUMN PAGN1: MVI A,' ' ; CALL LSTCH ;MINIMUM ONE SPACE LDA COL ; SBI PNOCOL ; JM PAGN1 ; ;"PAGE" TEXT LXI H,PGETXT ; CALL LSTRNG ; ;NUMBER LHLD PAGE ; CALL DECPR ; ;PRINT SUBTITLE IF ANY LDA STFLAG ; ORA A ; JZ NOPGNO ; LDA SUBTF ; ORA A ; JZ NOPGNO ; MVI A,CR ; CALL LSTCH ; MVI A,LF ; CALL LSTCH ; LXI H,STLBUF ; CALL LSTRNG ; ;TEST IF EITHER OF ABOVE WAS PRINTED NOPGNO: LHLD TFLAG ; LDA PNFLAG ; ORA L ; JZ PTTLEX ;NO, NEED NO CRLF'S ;CR AND 2 LF'S MVI A,CR ; CALL LSTCH ; MVI A,LF ; CALL LSTCH ; MVI A,LF ; CALL LSTCH ; PTTLEX: POP H ; POP PSW ; RET ; ;SUBR TO LIST STRING (HL) TO NULL LSTRNG: MOV A,M ; ORA A ; RZ ; INX H ; PUSH H ; CALL LSTCH ; POP H ; JMP LSTRNG ; ;DECIMAL PRINT HL, UNSIGNED DECPR: PUSH B ; PUSH D ; PUSH H ; LXI B,-10 ;MINUS RADIX LXI D,-1 ;BECOMES NUMBER/RADIX DECPR1: DAD B ; INX D ; JC DECPR1 ;SUBTRACT TILL NEGATIVE LXI B,10 ; DAD B ;AD RADIX BACK ONCE XCHG ;HAVE N/10 IN HL, REM. IN DE MOV A,H ; ORA L ; CNZ DECPR ;GET REMAINING DIGITS, IF ANY MOV A,E ; ADI '0' ; CALL LOCH ;PRINT THIS DIGIT POP H ; POP D ; POP B ; RET ; ;OUTPUT MESSAGE TO CONSOLE PCOMSG: MVI C,PRINT ;MSG POINTER IN DE CALL BDOS ; RET ; ;OUTPUT CHAR IN A REG. CONO: PUSH PSW ; PUSH B ; PUSH D ; PUSH H ; MOV E,A ; MVI C,CONOUT ; CALLEN: CALL BDOS ; POP H ; POP D ; POP B ; POP PSW ; RET ; ; CLOCK: PUSH PSW ;*** SAVE ALL REGISTERS *** PUSH B ; PUSH D ; PUSH H ; ; LXI H,TIME+4 ;SET MEM. POINTER TO START OF TIME SLOT MVI A,0 ;HR. TENS ADDRESS CALL GETDIG ;GET IT MVI A,1 ;HR. UNITS CALL GETDIG ;GET IT INX H ;SKIP ":" MVI A,2 ;MIN. TENS CALL GETDIG ;GET IT MVI A,3 ;MIN. UNITS CALL GETDIG ;GET IT INX H ;SKIP ":" MVI A,4 ;SEC. TENS CALL GETDIG ;GET IT MVI A,5 ;SEC. UNITS CALL GETDIG ;GET IT LXI H,TIME+19 ;SET DATE ADDRESS MVI A,8 ;MONTH TENS OUT CLK ;SEND TO CLOCK PORT CALL DELAY ;WAIST SOME TIME IN CLK ;READ PORT ANI 0FH ;CLEAR SOME BITS ADI 48 ;MAKE IT ASCII CPI 63 ;TEST FOR "15" CZ SET1 ;IF SO THEN SET TO BLANK MOV M,A ;PUT IN MEM. MVI A,9 ;MONTH UNITS CALL GETDIG ;GET IT INX H ;SKIP "/" MVI A,10 ;DAY TENS CALL GETDIG ;GET IT MVI A,11 ;DAY UNITS CALL GETDIG ;GET IT LXI H,TIME ;RESET INDEX REGISTER TO START OF TIME MESS. YY1 MOV A,M ;SEND IT TO THE PRINTER CPI '$' ;CHECK FOR END OF MESS. JZ ZZ1 ;IF SO JUMP TO RETURN SECTION PUSH H ; CALL LOCH ; POP H ; INX H ; JMP YY1 ;DO IT AGAIN ; ZZ1 POP H ;RESTORE ALL REGISTERS AND RETURN POP D ; POP B ; POP PSW ; RET ; ; SET1: MVI A,20H ; RET ; ; GETDIG: OUT CLK ;SEND CHAR. IN REG. A TO PORT CALL DELAY ; IN CLK ;READ PORT ANI 0FH ; ADI 48 ;MAKE IT ASCII INX H ;POINT TO NEXT SLOT IN MEM. MOV M,A ;PUT IT THERE RET ;RETURN ; DELAY: LXI D,02FFH ;WAIST SOME TIME WAIT1: DCR E ;CPU TOO FAST FOR CLOCK JNZ WAIT1 ; DCR D ; JNZ WAIT1 ; RET ; ; CMSG1: DB RESET DB '* * * XT VER. 1.1.A * * *' DB CR,LF,LF DB 'LISTING CONTROL CONSOLE COMMANDS:' DB CR,LF,LF DB 'Control U aborts listing' DB CR,LF DB 'Control S stops-restarts listing' DB CR,LF,LF DB 'The default Title Line is:' DB CR,LF,LF,24H CMSG2: DB CR,LF,LF DB 'Do you want to enter a new TITLE or ' DB 'SUBTITLE',CR,LF DB 'YES - enter Y',CR,LF DB 'NO - enter CR ??$' CMSG4: DB CR,LF,LF DB 'Enter New Title (enter a CR to ' DB 'retain Default Title)',CR,LF DB 'Title can be one line only - ' DB '60 characters maximum - ' DB 'End with a CR',CR,LF,'$' CMSG6: DB CR,LF,LF DB 'Enter Subtitle (a CR skips subtitle)' DB CR,LF DB 'SUBTITLE can be multiple lines. ' DB 'If you want to enter additional lines ' DB CR,LF DB 'end preceeding lines with a control Z. ' DB 'End Subtitle input with a CR.' DB CR,LF,24H CMSG7: DB CR,LF,LF DB '* * * POSITION PAPER TO TOP LINE * * *' DB CR,LF,LF DB 'Enter CR when ready',CR,LF,'$' MERR: DB CR,LF,'SOME KIND OF ERROR' DB CR,LF,24H EMFNF: DB LF,'FILE NOT FOUND',CR,LF,'$' TIME: DB 'TIME HH:MM:SS DATE MM/DD/1979',CR,LF,'$' EMQUES: DB LF,'NO *.S OR ?.S PLEASE!' DB CR,LF,24H PGETXT: DB 'PAGE ' DB 0 TFLAG: DB 0FFH ;MAKE 0 TO SUPPRESS TITLE PNFLAG: DB 0FFH ;MAKE 0 TO SUPPRESS PAGE NOS. STFLAG: DB 0FFH ;MAKE 0 TO SUPPRESS SUBTITLE DS 1 SUBTF: DS 1 ;SUBTITLE PRESENT FLAG SBTPNT: DS 2 ;SUBTITLE BUFFER POINTER IPOINT: DS 2 ;INPUT BUFFER POINTER ICOUNT: DS 1 ;INPUT BUFFER DOWN-COUNTER COL: DS 1 LINE: DS 1 PAGE: DS 2 CALRSP: DS 2 ;CALLER'S STACK POINTER RDBUFF: DS 84 ;SPACE FOR CP/M BUFFERED READ TTLBUF: DS 80 ;SPACE FOR TITLE STLBUF: DS 100H ;SPACE FOR SUBTITLE DS 80 TIMESP: DS 29 STACK: DS 4 DSTACK: DS 2