Libris Britannia 4

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Text File | 1986-07-31 | 54KB | 2,480 lines

***************************************************************** * RAFOS FORTH V1.0 26 March 1986 * * * * --- ROM #2 of 2 * * * * (C) Copyright 1986, Everett Carter. All rights reserved. * * * * This FORTH is a subset of the FORTH-79 standard. * * Some changes have been made in order to save on * * space in the limited memory of the float. * * * ***************************************************************** * ROM EQU $1000 ROM #2 start address ROM1 EQU $1800 ROM #1 start address * ORG ROM * CR EQU $0D CARRIAGE RETURN LF EQU $0A LINE FEED BL EQU $20 BLANK BS EQU $08 Back Space DEL EQU $7F Delete * DDR EQU 4 DATA DIRECTION REGISTER OFFSET * PORTA EQU 0 I/O PORT 0 PORTB EQU 1 I/O PORT 1 PUT EQU PORTB SERIAL I/O PORT * INITSP EQU $7F INITIAL STACK POINTER VALUE STACK EQU INITSP-5 TOP OF STACK MEMSIZ EQU $2000 MEMORY ADDRESS SPACE SIZE * SP0 EQU $0F00 RP0 EQU $0E00 TIB EQU $0D80 * * * * RAM VARIABLES * * ATEMP EQU $10 TEMP USED IN PUTDEC XTEMP EQU $11 INDEX TEMPORARY GETR EQU $12 PICK & DROP TEMPORARY COUNT EQU $16 NUMBER OF BITS LEFT TO get/send CHAR EQU $17 Current input/output character * BYTCNT EQU $1E bytcnt. WTIME EQU $20 TIMER INTERRUPT FROM WAIT STATE * * PH EQU $21 MISC SCRATCH AREAS PL EQU $22 TEMPA EQU $23 TEMPB EQU $24 QH EQU $25 QL EQU $26 TEMP EQU $27 TERM EQU $28 * * IN EQU $29 Where FORTH will look for input OUT EQU $2A COUNTR EQU $2B DP EQU $2C The initial Dictionary pointer START EQU $2E The start up vector * * IP EQU $30 THE FORTH INSTRUCTION POINTER RP EQU $32 THE RETURN POINTER OFFSET SP EQU $33 THE STACK POINTER OFFSET BASE EQU $34 * USER EQU $35 The space for USER variables FENCE EQU 0 USER + 0 STATE EQU 2 USER + 2 FORTH EQU 4 USER + 4 CONTEXT EQU 6 USER + 6 CURRENT EQU 8 USER + 8 HLD EQU $0A USER + $0A * * * List of previous FORTH words (ROM 1) * DOCOL EQU $80 DOCOL DOCOL1 EQU DOCOL NEXT EQU $009E NEXT NEXT1 EQU $00CE LOAD EQU $00D1 GET EQU $00D5 TYPE EQU $00DF TYPE FIN6 EQU $0116 <FIND> BRAN EQU $01A9 BRAN ZBRAN EQU $19D2 ZBRANCH ZBREX EQU ZBRAN+$12 EXIT EQU $19F8 EXIT EXE7 EQU $1A10 EXECUTE INLINE EQU $1A22 EMIT EQU $1A79 EMIT BL2 EQU $1A8D BL WORD EQU $1AA4 WORD MPY16 EQU $1AFD NUM8 EQU $1B27 <NUMBER> DROP EQU $1BBE DROP CFCH EQU $1BCC C@ FTCH EQU $1BF2 @ DP2 EQU $1C1D DP HERE EQU $1C34 HERE NOT3 EQU $1C42 NOT ONEP EQU $1C5B 1+ HLD3 EQU $1C78 HLD DOUSE EQU $1C7A DOUSE STA5 EQU $1C91 STATE CON7 EQU $1C9B CONTEXT CUR7 EQU $1CA5 CURRENT FOR5 EQU $1CAF FORTH STO EQU $1CB9 ! CSTO EQU $1CE4 C! COMA EQU $1D04 , CCOMA EQU $1D37 C, DUP3 EQU $1D55 DUP PLSTO EQU $1D75 +! LAT6 EQU $1DAE LATEST ALL5 EQU $1DBE ALLOT LIT3 EQU $1DCC LIT SWAP EQU $1F07 SWAP CRE6 EQU $1FDE CREATE * * * LOK EQU $1E53 OK EQU LOK+1 * * OUTER EQU $1E57 * COLD EQU $1EA5 WARM EQU $1EE6 GETC EQU $1F43 GETCHAR EQU GETC PUTC EQU $1F7A OUTCHAR EQU PUTC WAIT EQU $1FA8 DELAY EQU WAIT CRLF EQU $1FC3 * RESET EQU COLD * ************************************************************************** * QUES LDA DP checks for errors at end of OUTER STA GET+1 LDA DP+1 STA GET+2 LDX #1 JSR GET CMP #$80 = buffer end ? BNE QERR QEXIT LDX SP * H1 EQU LOK/$100*$100 L EQU LOK-H1 H EQU LOK/$100 * LDA #L DECX STA SP0,X LDA #H DECX STA SP0,X STX SP LDA START STA IP LDA START+1 STA IP+1 JMP NEXT QERR LDA DP STA LOAD+1 LDA DP+1 STA LOAD+2 CLRX JSR GET INCA INCA JSR LOAD TAX LDA #$3F A='?' JSR LOAD LDX SP LDA DP+1 DECX STA SP0,X LDA DP DECX STA SP0,X STX SP JMP WARM * FCB 4 QUIT FCC 'QUI' FDB CRE6-6 link to CREATE QUIT BRA QEXIT * FCB 6 TOGGLE FCC 'TOG' FDB QUIT-6 link to QUIT TOG6 LDX SP INCX drop high byte LDA SP0,X INCX STA ATEMP LDA SP0,X get addr INCX STA LOAD+1 STA GET+1 LDA SP0,X INCX STX SP STA LOAD+2 STA GET+2 CLRX JSR GET EOR ATEMP JSR LOAD JMP NEXT * FCB 9 IMMEDIATE FCC 'IMM' FDB TOG6-6 link to TOGGLE IMM9 JMP DOCOL FDB LAT6 FDB LIT3 FDB $80 FDB TOG6 FDB EXIT * FCB 5 -FIND FCC '-FI' FDB IMM9-6 link to IMMEDIATE DFND JMP DOCOL FDB BL2 FDB WORD FDB CON7 FDB FTCH FDB FTCH FDB FIN6 FDB EXIT * FCB 5 COUNT FCC 'COU' FDB DFND-6 link to -FIND COU5 JMP DOCOL FDB DUP3 FDB ONEP FDB SWAP FDB CFCH FDB EXIT * FCB 1 0 FCC '0 ' FDB COU5-6 link to COUNT ZERO LDX SP CLRA DECX STA SP0,X DECX STA SP0,X STX SP JMP NEXT * FCB 1 1 FCC '1 ' FDB ZERO-6 link to 0 ONE LDX SP LDA #1 DECX STA SP0,X DECX CLRA STA SP0,X STX SP JMP NEXT * FCB 1 2 FCC '2 ' FDB ONE-6 link to 1 TWO LDX SP LDA #2 DECX STA SP0,X CLRA DECX STA SP0,X STX SP JMP NEXT * FCB 2 2+ FCC '2+ ' FDB TWO-6 link to 2 TWOP LDX SP INCX point to low LDA #2 ADD SP0,X STA SP0,X DECX point to high CLRA A=0 note carry ADC SP0,X is not affected STA SP0,X JMP NEXT * FCB $81 [ (IMMEDIATE) FCC '[ ' FDB TWOP-6 link to 2+ LBRAK JMP DOCOL FDB ZERO FDB STA5 FDB STO FDB EXIT * FCB 1 ] FCC '] ' FDB LBRAK-6 link to [ RBRAK JMP DOCOL FDB LIT3 FDB $C0 FDB STA5 FDB STO FDB EXIT * FCB 11 DEFINITIONS FCC 'DEF' FDB RBRAK-6 link to ] DEFS JMP DOCOL FDB CON7 FDB FTCH FDB CUR7 FDB STO FDB EXIT * FCB 1 + FCC '+ ' FDB DEFS-6 link to DEFINITIONS PLUS LDX SP LDA SP0,X INCX STA PH LDA SP0,X INCX STX SP INCX point to low on stack ADD SP0,X STA SP0,X LDX SP LDA PH ADC SP0,X STA SP0,X JMP NEXT * FCB 1 - FCC '- ' FDB PLUS-6 link to + MINUS LDX SP LDA SP0,X INCX STA PH LDA SP0,X INCX STA PL STX SP INCX point to low on stack LDA SP0,X SUB PL STA SP0,X LDX SP LDA SP0,X SBC PH STA SP0,X JMP NEXT * FCB 2 U* FCC 'U* ' FDB MINUS-6 link to - UMULT LDX SP LDA SP0,X INCX STA PH LDA SP0,X INCX STA PL LDA SP0,X INCX STA QH LDA SP0,X STA QL STX XTEMP JSR MPY16 LDX XTEMP LDA QL push low word STA SP0,X LDA QH DECX STA SP0,X LDA TEMPB push high word DECX STA SP0,X LDA TEMPA DECX STA SP0,X STX SP JMP NEXT * SEC EQU PH * DIV16 LDA SEC+2 Dividend: (H to L) LDX SEC PL,PH,TEMPB,TEMPA STX SEC+2 (SEC +1,+0,+3,+2) LSLA STA SEC LDA SEC+3 Divisor is QH,QL LDX SEC+1 STX SEC+3 ROLA STA SEC+1 LDA #$10 STA TEMP DBEG ROL SEC+2 ROL SEC+3 LDA SEC+2 SUB QL TAX LDA SEC+3 SBC QH BCS DSKIP STX SEC+2 STA SEC+3 SEC BRA DSKIP+1 DSKIP CLC ROL SEC Quotient (H,L) is ROL SEC+1 SEC+1,SEC DEC TEMP Remainder (H,L) is BNE DBEG SEC+3,SEC+2 RTS * FCB 5 U/MOD FCC 'U/M' FDB UMULT-6 link to U* UDMD LDX SP LDA SP0,X INCX STA QH divisor to Q LDA SP0,X INCX STA QL LDA SP0,X INCX STA SEC+1 high word to P LDA SP0,X (SEC +1, +0) INCX STA SEC LDA SP0,X INCX STA SEC+3 low word to TEMPA/B LDA SP0,X (SEC +3, +2) STA SEC+2 STX SP BSR DIV16 LDX SP LDA SEC+2 push remainder STA SP0,X (HL: SEC+3, +2) LDA SEC+3 DECX STA SP0,X LDA SEC push quotient DECX (HL: SEC+1, +0) STA SP0,X LDA SEC+1 DECX STA SP0,X STX SP JMP NEXT * FCB 4 S->D FCC 'S->' FDB UDMD-6 link to U/MOD STOD LDX SP LDA SP0,X TSTA BPL SPOS LDA #$FF BRA SEXIT SPOS CLRA SEXIT DECX STA SP0,X DECX STA SP0,X STX SP JMP NEXT * FCB 3 PAD FCC 'PAD' FDB STOD-6 link to S->D PAD JMP DOCOL FDB HERE FDB LIT3 FDB $0044 FDB PLUS FDB EXIT * FCB 2 <# FCC '<# ' FDB PAD-6 link to PAD LSHP JMP DOCOL FDB PAD FDB HLD3 FDB STO FDB EXIT * FCB 4 OVER FCC 'OVE' FDB LSHP-6 link to <# OVER LDX SP INCX INCX LDA SP0,X INCX STA ATEMP LDA SP0,X LDX SP DECX STA SP0,X LDA ATEMP DECX STA SP0,X STX SP JMP NEXT * FCB 2 #> FCC '#> ' FDB OVER-6 link to OVER SPGR JMP DOCOL FDB DROP FDB DROP FDB HLD3 FDB FTCH FDB PAD FDB OVER FDB MINUS FDB EXIT * FCB 2 >R FCC '>R ' FDB SPGR-6 link to #> TOR LDX SP LDA SP0,X INCX STA ATEMP LDA SP0,X INCX STX SP LDX RP DECX STA RP0,X LDA ATEMP DECX STA RP0,X STX RP JMP NEXT * FCB 2 R> FCC 'R> ' FDB TOR-6 link to >R RTO LDX RP LDA RP0,X INCX STA ATEMP LDA RP0,X INCX STX RP LDX SP DECX STA SP0,X LDA ATEMP DECX STA SP0,X STX SP JMP NEXT * FCB 2 R@ FCC 'R@ ' FDB RTO-6 link to R> RFTCH LDX RP LDA RP0,X pop high INCX STA ATEMP LDA RP0,X pop low LDX SP DECX STA SP0,X push low LDA ATEMP DECX STA SP0,X push high STX SP JMP NEXT * FCB 3 ROT FCC 'ROT' FDB RFTCH-6 link to R@ ROT JMP DOCOL FDB TOR FDB SWAP FDB RTO FDB SWAP FDB EXIT * FCB 4 HOLD FCC 'HOL' FDB ROT-6 link to ROT HOLD JMP DOCOL FDB LIT3 FDB $FFFF ( -1 ) FDB HLD3 FDB PLSTO FDB HLD3 FDB FTCH FDB CSTO FDB EXIT * FCB 5 M/MOD FCC 'M/M' FDB HOLD-6 link to HOLD MDM5 JMP DOCOL FDB TOR FDB ZERO FDB RFTCH FDB UDMD FDB RTO FDB SWAP FDB TOR FDB UDMD FDB RTO FDB EXIT * FCB 4 BASE FCC 'BAS' FDB MDM5-6 link to M/MOD BAS4 JMP DOCOL FDB LIT3 FDB BASE FDB EXIT * FCB 6 SMUDGE FCC 'SMU' FDB BAS4-6 link to BASE SMUDG JMP DOCOL FDB LAT6 FDB LIT3 FDB $0020 FDB TOG6 FDB EXIT * FCB 3 ABS FCC 'ABS' FDB SMUDG-6 link to SMUDGE ABS LDX SP LDA SP0,X TSTA BPL ABXIT COMA STA SP0,X INCX LDA SP0,X NEGA STA SP0,X ABXIT JMP NEXT * FCB 2 0< FCC '0< ' FDB ABS-6 link to ABS ZLESS LDX SP LDA SP0,X TSTA BPL ZLPOS LDA #$FF BRA ZLXIT ZLPOS CLRA ZLXIT STA SP0,X INCX STA SP0,X JMP NEXT * FCB 2 0= FCC '0= ' FDB ZLESS-6 link to 0< ZEQ LDX SP LDA SP0,X INCX ORA SP0,X BNE ZEN LDA #$FF BRA ZEXIT ZEN CLRA ZEXIT STA SP0,X DECX STA SP0,X JMP NEXT * FCB 1 < FCC '< ' FDB ZEQ-6 link to 0= LESS JMP DOCOL FDB MINUS FDB ZLESS FDB EXIT * FCB 1 > FCC '> ' FDB LESS-6 link to < GREAT JMP DOCOL FDB SWAP FDB LESS FDB EXIT * FCB 1 = FCC '= ' FDB GREAT-6 link to > EQUAL JMP DOCOL FDB MINUS FDB ZEQ FDB EXIT * FCB 4 SIGN FCC 'SIG' FDB EQUAL-6 link to = SIGN JMP DOCOL FDB ZLESS FDB ZBRAN FDB $0008 FDB LIT3 FDB $002D FDB HOLD FDB EXIT * FCB 6 NEGATE FCC 'NEG' FDB SIGN-6 link to SIGN NEG6 LDX SP LDA SP0,X COMA STA SP0,X INCX LDA SP0,X NEGA STA SP0,X JMP NEXT * FCB 2 +- FCC '+- ' FDB NEG6-6 link to NEGATE PLMI JMP DOCOL FDB ZLESS FDB ZBRAN FDB $0004 FDB NEG6 FDB EXIT * FCB 1 # FCC '# ' FDB PLMI-6 link to +- SHARP JMP DOCOL FDB BAS4 FDB CFCH FDB MDM5 FDB ROT FDB LIT3 FDB $0009 FDB OVER FDB LESS FDB ZBRAN FDB $0008 FDB LIT3 FDB $0007 FDB PLUS FDB LIT3 FDB $0030 FDB PLUS FDB HOLD FDB EXIT * FCB 2 OR FCC 'OR ' FDB SHARP-6 link to # OR2 LDX SP LDA SP0,X INCX INCX ORA SP0,X STA SP0,X DECX LDA SP0,X INCX INCX ORA SP0,X STA SP0,X DECX STX SP JMP NEXT * FCB 3 AND FCC 'AND' FDB OR2-6 link to OR AND3 LDX SP LDA SP0,X INCX INCX AND SP0,X STA SP0,X DECX LDA SP0,X INCX INCX AND SP0,X STA SP0,X DECX STX SP JMP NEXT * FCB 3 XOR FCC 'XOR' FDB AND3-6 link to AND XOR3 LDX SP LDA SP0,X INCX INCX EOR SP0,X STA SP0,X DECX LDA SP0,X INCX INCX EOR SP0,X STA SP0,X DECX STX SP JMP NEXT * FCB 4 DDUP FCC 'DDU' FDB XOR3-6 link to XOR DDUP JMP DOCOL FDB OVER FDB OVER FDB EXIT * FCB 2 #S FCC '#S ' FDB DDUP-6 link to DDUP SHRPS JMP DOCOL FDB SHARP FDB DDUP FDB OR2 FDB ZEQ FDB ZBRAN FDB $FFF6 FDB EXIT * FCB 1 . FCC '. ' FDB SHRPS-6 link to #S DOT JMP DOCOL FDB DUP3 FDB DUP3 FDB ABS FDB STOD FDB LSHP FDB SHRPS FDB ROT FDB SIGN FDB SPGR FDB TYPE FDB DROP FDB BL2 FDB EMIT FDB EXIT * FCB 7 COMPILE FCC 'COM' FDB DOT-6 link to . COMP JMP DOCOL FDB RTO FDB DUP3 FDB TWOP FDB TOR FDB FTCH FDB COMA FDB EXIT * FCB $81 ; (IMMEDIATE) FCC '; ' FDB COMP-6 link to COMPILE SEMI JMP DOCOL FDB COMP FDB EXIT FDB SMUDG FDB LBRAK FDB EXIT * FCB 1 : FCC ': ' FDB SEMI-6 link to ; COLON JMP DOCOL FDB CUR7 FDB FTCH FDB CON7 FDB STO FDB CRE6 FDB SMUDG FDB COMP JMP DOCOL FDB RBRAK FDB EXIT * FCB $81 ' (IMMEDIATE) FCB $27 FCC ' ' FDB COLON-6 link to : TICK JMP DOCOL FDB DFND FDB ZBRAN FDB $0006 FDB DROP FDB EXIT FDB QUES * DOVAR LDX SP LDA NEXT1+2 low byte of W ADD #3 DECX STA SP0,X LDA NEXT1+1 high byte of W ADC #0 DECX STA SP0,X STX SP JMP NEXT * FCB 8 VARIABLE FCC 'VAR' FDB TICK-6 link to ' VAR8 JMP DOCOL FDB CRE6 FDB LIT3 compile a jump FDB $00CC to DOVAR FDB CCOMA FDB COMP FDB DOVAR FDB TWO FDB ALL5 FDB EXIT * DOCON LDA NEXT1+2 put W+2 into GET ADD #3 STA GET+2 LDA NEXT1+1 ADC #0 STA GET+1 LDX #1 JSR GET get low byte of constant LDX SP DECX STA SP0,X STX SP CLRX JSR GET then the high byte LDX SP DECX STA SP0,X STX SP JMP NEXT * FCB 8 CONSTANT FCC 'CON' FDB VAR8-6 link to VARIABLE CON8 JMP DOCOL FDB CRE6 FDB LIT3 compile a jump to DOCON FDB $00CC FDB CCOMA FDB COMP FDB DOCON FDB COMA FDB EXIT * FCB 1 * FCC '* ' FDB CON8-6 link to CONSTANT MULT JMP DOCOL FDB UMULT FDB DROP FDB EXIT * FCB $89 [COMPILE] IMMEDIATE FCC '[CO' FDB MULT-6 link to * BCOM9 JMP DOCOL FDB TICK FDB COMA FDB EXIT * FCB $85 BEGIN IMMEDIATE FCC 'BEG' FDB BCOM9-6 link to [COMPILE] BEGN JMP DOCOL FDB HERE FDB EXIT * FCB $85 AGAIN IMMEDIATE FCC 'AGA' FDB BEGN-6 link to BEGIN AGAIN JMP DOCOL FDB COMP FDB BRAN FDB HERE FDB MINUS FDB COMA FDB EXIT * FCB $85 UNTIL IMMEDIATE FCC 'UNT' FDB AGAIN-6 link to AGAIN UNTIL JMP DOCOL FDB COMP FDB ZBRAN FDB HERE FDB MINUS FDB COMA FDB EXIT * FCB $82 IF IMMEDIATE FCC 'IF ' FDB UNTIL-6 link to UNTIL IF2 JMP DOCOL FDB COMP FDB ZBRAN FDB HERE FDB ZERO FDB COMA FDB EXIT * FCB $84 THEN IMMEDIATE FCC 'THE' FDB IF2-6 link to IF THEN JMP DOCOL FDB HERE FDB OVER FDB MINUS FDB SWAP FDB STO FDB EXIT * FCB $84 ELSE IMMEDIATE FCC 'ELS' FDB THEN-6 link to THEN ELSE JMP DOCOL FDB COMP FDB BRAN FDB HERE FDB ZERO FDB COMA FDB SWAP FDB THEN FDB EXIT * FCB $85 WHILE IMMEDIATE FCC 'WHI' FDB ELSE-6 link to ELSE WHILE JMP DOCOL FDB IF2 FDB EXIT * FCB $86 REPEAT IMMEDIATE FCC 'REP' FDB WHILE-6 link to WHILE REPET JMP DOCOL FDB TOR FDB AGAIN FDB RTO FDB THEN FDB EXIT * FCB 4 <."> FCC '<."' FDB REPET-6 link to REPEAT BDOTQ JMP DOCOL FDB RFTCH FDB COU5 FDB DUP3 FDB ONEP FDB RTO FDB PLUS FDB TOR FDB TYPE FDB EXIT * FCB 3 TIB FCC 'TIB' FDB BDOTQ-6 link to <."> TIB3 JMP DOCOL FDB LIT3 FDB TIB FDB EXIT * FCB 3 >IN FCC '>IN' FDB TIB3-6 link to TIB FRIN JMP DOCOL FDB LIT3 FDB IN FDB EXIT * FCB 7 'STREAM FCB $27 FCC 'ST' FDB FRIN-6 link to >IN TSTRM JMP DOCOL FDB TIB3 FDB FRIN FDB CFCH FDB PLUS FDB EXIT * FCB 4 <DO> FCC '<DO' FDB TSTRM-6 link to 'STREAM BDO LDA #4 STA COUNTR ADD SP make 2 artificial pops STA SP DOAGIN LDX SP move limit DECX then index LDA SP0,X from SP STX SP to RP LDX RP DECX STA RP0,X STX RP DEC COUNTR BNE DOAGIN LDA #4 adjust SP ADD SP STA SP JMP NEXT * FCB 6 <LOOP> FCC '<LO' FDB BDO-6 link to <DO> BLOP CLR PH set increment to 1 LDA #1 STA PL LOOPS LDX RP increment index INCX by value LDA PL in P H/L ADD RP0,X STA RP0,X DECX LDA PH ADC RP0,X STA RP0,X INCX LDA RP0,X test index-limit INCX INCX SUB RP0,X LDX RP LDA RP0,X INCX INCX SBC RP0,X EOR PH also check increment sign BMI LAGIN loop again if negative INCX INCX STX RP JMP ZBREX LAGIN JMP BRAN * FCB 7 <+LOOP> FCC '<+L' FDB BLOP-6 link to <LOOP> BPLOP LDX SP LDA SP0,X INCX STA PH set increment LDA SP0,X from the stack INCX STA PL STX SP BRA LOOPS * FCB $82 DO IMMEDIATE FCC 'DO ' FDB BPLOP-6 link to <+LOOP> DO JMP DOCOL FDB COMP FDB BDO FDB HERE FDB EXIT * FCB $84 LOOP IMMEDIATE FCC 'LOO' FDB DO-6 link to DO LOOP JMP DOCOL FDB COMP FDB BLOP FDB HERE FDB MINUS FDB COMA FDB EXIT * FCB $85 +LOOP IMMEDIATE FCC '+LO' FDB LOOP-6 link to LOOP PLOOP JMP DOCOL FDB COMP FDB BPLOP FDB HERE FDB MINUS FDB COMA FDB EXIT * FCB 7 DNEGATE FCC 'DNE' FDB PLOOP-6 link to +LOOP DNEG7 LDA #3 STA COUNTR LDX SP DNLP LDA SP0,X ones complement COMA three bytes STA SP0,X INCX DEC COUNTR BNE DNLP LDA SP0,X twos complement NEGA the fourth STA SP0,X JMP NEXT * FCB $81 I IMMEDIATE FCC 'I ' FDB DNEG7-6 link to DNEGATE I1 JMP DOCOL FDB COMP FDB RFTCH FDB EXIT * * * * END $ ***************************************************************** * RAFOS FORTH V1.0 26 March 1986 * * -- ROM #1 of 2 * * * * (C) Copyright 1986, Everett Carter. All rights reserved. * * * * This FORTH is a subset of the FORTH-79 standard. * * Some changes have been made in order to save on * * space in the limited memory of the float. * * * ***************************************************************** * * EQUATES FOR ROM 2 QUES EQU $1000 * TOG6 EQU $105F TOGGLE IMM9 EQU $1089 IMMEDIATE DFND EQU $109B -FIND COU5 EQU $10B1 COUNT ZERO EQU $10C3 0 ONE EQU $10D8 1 TWO EQU $10EF 2 TWOP EQU $1106 2+ LBRAK EQU $1121 [ RBRAK EQU $1131 ] DEFS EQU $1143 DEFINITIONS PLUS EQU $1155 + MINUS EQU $117C - UMULT EQU $11A7 U* * PAD EQU $1289 PAD LSHP EQU $129B <# OVER EQU $12AB OVER SPGR EQU $12CE #> TOR EQU $12E6 >R RTO EQU $130A R> RFTCH EQU $132E R@ ROT EQU $134F ROT HOLD EQU $1361 HOLD * COMP EQU $1557 COMPILE SEMI EQU $156D ; COLON EQU $157F : TICK EQU $159B ' VAR8 EQU $15C5 VARIABLE * I1 EQU $17EE I * LATEST EQU I1-6 Last Dictionary entry * ROM EQU $1800 ROM #1 start address * CR EQU $0D CARRIAGE RETURN LF EQU $0A LINE FEED BL EQU $20 BLANK BS EQU $08 Back Space DEL EQU $7F Delete * DDR EQU 4 DATA DIRECTION REGISTER OFFSET * PORTA EQU 0 I/O PORT 0 PORTB EQU 1 I/O PORT 1 PUT EQU PORTB SERIAL I/O PORT * INITSP EQU $7F INITIAL STACK POINTER VALUE STACK EQU INITSP-5 TOP OF STACK MEMSIZ EQU $2000 MEMORY ADDRESS SPACE SIZE * SP0 EQU $0F00 RP0 EQU $0E00 TIB EQU $0D80 * * * * RAM VARIABLES * * ORG $10 ON-CHIP RAM (112 BYTES) * ATEMP EQU $10 TEMP USED IN PUTDEC XTEMP EQU $11 INDEX TEMPORARY GETR EQU $12 PICK & DROP TEMPORARY COUNT EQU $16 NUMBER OF BITS LEFT TO get/send CHAR EQU $17 Current input/output character * BYTCNT EQU $1E bytcnt. WTIME EQU $20 TIMER INTERRUPT FROM WAIT STATE * * PH EQU $21 MISC SCRATCH AREAS PL EQU $22 TEMPA EQU $23 TEMPB EQU $24 QH EQU $25 QL EQU $26 TEMP EQU $27 TERM EQU $28 * ORG $0029 * IN FCB #0 Where FORTH will look for input OUT FCB #0 COUNTR FCB #0 DP FDB #$01D0 The initial Dictionary pointer START FDB #0 The start up vector * * IP FDB #0 THE FORTH INSTRUCTION POINTER RP FCB #0 THE RETURN POINTER OFFSET SP FCB #0 THE STACK POINTER OFFSET BASE FCB #$10 * USER EQU * The space for USER variables FENCE EQU 0 USER + 0 FDB #0 INITIALIZE USER VARS STATE EQU 2 USER + 2 FDB #0 FORTH EQU 4 USER + 4 FDB #0 CONTEXT EQU 6 USER + 6 FDB USER+FORTH CURRENT EQU 8 USER + 8 FDB USER+FORTH HLD EQU $0A USER + $0A FDB #0 * ORG $0080 * * The start of the INNER interpreter * DOCOL LDX RP * Push IP to RS * DOCOL1 EQU DOCOL * DECX LDA IP+1 STA RP0,X DECX LDA IP STA RP0,X STX RP LDA NEXT1+2 ADD #2 STA IP+1 LDA NEXT1+1 ADC #0 STA IP * * fall thru to NEXT * NEXT LDA IP+1 NEXT The Inner Interpreter STA CA+2 SELF-MODIFYING LDA IP STA CA+1 CA LDA SP0 -- SP0 is a dummy STA NEXT1+1 LDA IP+1 ADD #1 STA CA2+2 LDA IP ADC #0 STA CA2+1 CA2 LDA SP0 -- SP0 is a dummy STA NEXT1+2 LDA IP+1 ADD #2 STA IP+1 LDA IP ADC #0 STA IP NEXT1 JMP COLD -- COLD is a dummy * * SELF MODIFYING CODE FIRST * LOAD STA SP0,X STA (HERE),X RTS move A to HERE+X * GET LDA SP0,X LDA (HERE),X RTS get HERE+X into A * FCB 4 TYPE -- SELF MODIFYING FCC 'TYP' FDB #0 end link TYPE LDX SP INCX Drop high byte LDA SP0,X INCX STA COUNTR COUNTR = byte count LDA SP0,X INCX STA TYSCR+1 LDA SP0,X INCX STA TYSCR+2 STX SP CLR OUT TST COUNTR BEQ TXIT TLOOP LDX OUT TYSCR LDA SP0,X -- SP0 is a dummy JSR OUTCHAR INC OUT LDA OUT SUB COUNTR BMI TLOOP TXIT JMP NEXT * * FCB 6 <FIND> -- SELF MODIFYING FCC '<FI' FDB TYPE-6 link to TYPE FIN6 LDX SP LDA SP0,X get addr1 high INCX STA GET+1 LDA SP0,X addr1 low INCX STA GET+2 LDA SP0,X get addr2 high INCX STA FINSCR+1 STA FINCNT+1 LDA SP0,X INCX STA FINSCR+2 STA FINCNT+2 STX SP FINCNT LDA SP0 -- SP0 is a dummy STA COUNTR save byte count TSTA count = 0 ? BEQ NONE FINLP1 CLRX FINLP2 JSR GET AND #$7F ignore bit 7 FINSCR CMP SP0,X -- SP0 is a dummy BNE NFND CPX #3 X = 3 ? if so quit as FOUND BEQ FOUND CPX COUNTR X = count ? BEQ FOUND INCX BRA FINLP2 NFND LDX #4 Not found, go to next element JSR GET STA ATEMP INCX JSR GET ORA ATEMP =0 ? BEQ NONE if yes, end of list JSR GET else move new pointer to get STA GET+2 LDA ATEMP STA GET+1 BRA FINLP1 and try again NONE LDX SP nothing, push a FALSE to stack CLRA BRA FQUIT FOUND LDX SP LDA GET+2 push CA of found word ADD #6 DECX STA SP0,X LDA GET+1 ADC #0 DECX STA SP0,X STX SP CLRX JSR GET get the byte count and push it LDX SP DECX STA SP0,X CLRA DECX STA SP0,X LDA #$FF push a TRUE flag FQUIT DECX STA SP0,X DECX STA SP0,X STX SP JMP NEXT * FCB 4 BRAN -- SELF MODIFYING FCC 'BRA' FDB FIN6-6 link to <FIND> BRAN LDA IP STA BRSC1+1 STA BRSC2+1 LDA IP+1 STA BRSC1+2 STA BRSC2+2 LDX #1 BRSC1 LDA SP0,X ADD IP+1 STA IP+1 CLRX BRSC2 LDA SP0,X ADC IP STA IP JMP NEXT ***************************************************************** * * NO SELF MODIFYING CODE BEYOND THIS POINT * OFFSET EQU * ORG ROM+OFFSET * ROM #2 ORIGIN * * FCB 7 0BRANCH FCC '0BR' FDB BRAN-6 link to BRAN ZBRAN LDX SP LDA SP0,X INCX ORA SP0,X INCX STX SP TSTA BNE ZBREX JMP BRAN ZBREX LDA IP+1 bump IP past offset ADD #2 STA IP+1 LDA IP ADC #0 STA IP JMP NEXT * FCB 4 EXIT FCC 'EXI' FDB ZBRAN-6 link to 0BRANCH EXIT LDX RP Pop RS into IP LDA RP0,X High byte INCX STA IP LDA RP0,X then low byte INCX STA IP+1 STX RP JMP NEXT * FCB 7 EXECUTE FCC 'EXE' FDB EXIT-6 link to EXIT EXE7 LDX SP Pop SP into W (NEXT1+1) LDA SP0,X First high byte INCX STA NEXT1+1 LDA SP0,X Then low byte INCX STA NEXT1+2 STX SP JMP NEXT1 * INLINE JSR CRLF LDA #BL CLR COUNTR CLRX Clear line buffer INLP1 STA TIB,X INCX CPX #$7E Buffer end ? BNE INLP1 CLR IN CLRX Clear buffer pointer INLP2 JSR GETCHAR ( X = IN ) CMP #DEL = DELETE ? BNE INTST2 branch if not INDEL CPX #0 BEQ INLP2 Skip if IN (LBP) = 0 already DECX LDA #BL DELETE CHAR STA TIB,X LDA #BS JSR OUTCHAR LDA #BL JSR OUTCHAR LDA #BS JSR OUTCHAR BRA INLP2 INTST2 CMP #BS maybe its a backspace BEQ INDEL CMP #CR or a CR BEQ INEX STA TIB,X CPX #$7D BHS INSKP INCX INSKP JSR OUTCHAR BRA INLP2 Back to main loop INEX LDA #BL JSR OUTCHAR JMP NEXT * FCB 4 EMIT FCC 'EMI' FDB EXE7-6 link to EXECUTE EMIT LDX SP INCX drop high byte LDA SP0,X INCX STX SP JSR OUTCHAR JMP NEXT * FCB 2 BL FCC 'BL ' FDB EMIT-6 link to EMIT BL2 LDX SP LDA #BL DECX STA SP0,X CLRA DECX STA SP0,X STX SP JMP NEXT * FCB 4 WORD FCC 'WOR' FDB BL2-6 link to BL WORD LDA DP start by setting up LOAD STA LOAD+1 LDA DP+1 STA LOAD+2 CLR COUNTR CLRA CLRX JSR LOAD clear DP LDX SP get terminator INCX drop high byte LDA SP0,X STA TERM INCX STX SP LDX IN get INput pointer CMP #BL seperator = space ? BNE TOK IGNBL LDA TIB,X ignore blank CMP #BL BNE TOK INCX BRA IGNBL TOK INC COUNTR LDA TIB,X STX XTEMP save X LDX COUNTR JSR LOAD move char to DP + COUNTR LDX XTEMP get X back INCX CMP #$80 character = buffer end ? BEQ WORXIT CMP TERM BNE TOK continue unless terminator WORXIT STX IN save new value of IN LDA COUNTR move count-1 to DP DECA CLRX JSR LOAD LDA DP+1 Push DP addr to stack LDX SP DECX STA SP0,X LDA DP DECX STA SP0,X STX SP JMP NEXT * MPY16 LDX #$10 16 bit X 16 bit multiply 32 bit result CLR TEMPA CLR TEMPB ROR QH ROR QL MPYNXT BCC ROTAT LDA TEMPB ADD PL STA TEMPB LDA TEMPA ADC PH STA TEMPA ROTAT ROR TEMPA ROR TEMPB ROR QH ROR QL DECX BNE MPYNXT RTS * FCB 8 <NUMBER> FCC '<NU' FDB WORD-6 link to WORD NUM8 LDX SP pop stack into GET LDA SP0,X INCX STA GET+1 LDA SP0,X INCX STA GET+2 STX SP CLRX Put char count into COUNTR JSR GET STA COUNTR TSTA count = 0 ? BEQ NOTNO INCX CLR TEMP TEMP is the sign flag CLR QH CLR QL CLR PH Set P = BASE LDA BASE STA PL JSR GET Get first char CMP #$2D = '-' ? BNE NUMSKP DEC TEMP Minus flag = TRUE INCX bump X CPX COUNTR X > COUNTR ? BHI NOTNO JSR GET NUMSKP INCX at this point X points 1 past char in A SUB #$30 BMI NOTNO if negative, not a number CMP #$0A less than 10 ? BMI NUMB CMP #$11 valid char? BMI NOTNO SUB #7 NUMB CMP BASE valid for this base ? BLO ANUMB NOTNO CLRA NOPE, push a FALSE NUMXT LDX SP DECX STA SP0,X DECX STA SP0,X STX SP JMP NEXT ANUMB STX XTEMP save X in XTEMP STA ATEMP and A in ATEMP JSR MPY16 Q = Q * BASE LDA ATEMP get A back ADD QL Q = Q + A STA QL LDA QH ADC #0 STA QH LDX XTEMP get X back CPX COUNTR X > COUNTR ? BHI NUMOK JSR GET BRA NUMSKP NUMOK LDA TEMP number OK, now check sign TSTA BEQ NUMPOS CLRA NEG QL SBC QH STA QH NUMPOS LDX SP push number at Q and flag LDA QL DECX STA SP0,X LDA QH DECX STA SP0,X LDA #$FF TRUE flag BRA NUMXT+2 * FCB 4 DROP FCC 'DRO' FDB NUM8-6 link to <NUMBER> DROP LDX SP INCX INCX STX SP JMP NEXT * FCB 2 C@ FCC 'C@ ' FDB DROP-6 link to DROP CFCH LDX SP LDA SP0,X INCX STA GET+1 LDA SP0,X STA GET+2 STX SP CLRX get the byte JSR GET LDX SP STA SP0,X CLRA zero high byte DECX STA SP0,X STX SP JMP NEXT * FCB 1 @ FCC '@ ' FDB CFCH-6 link to C@ FTCH LDX SP LDA SP0,X INCX STA GET+1 LDA SP0,X STA GET+2 STX SP LDX #1 get low byte JSR GET LDX SP STA SP0,X CLRX get high byte JSR GET LDX SP DECX STA SP0,X STX SP JMP NEXT * FCB 2 DP FCC 'DP ' FDB FTCH-6 link to @ DP2 LDX SP push address of DP to stack LDA #DP this routine knows that DP is on page zero DECX STA SP0,X CLRA DECX STA SP0,X STX SP JMP NEXT * FCB 4 HERE FCC 'HER' FDB DP2-6 Link to DP HERE JMP DOCOL FDB DP2 FDB FTCH FDB EXIT * FCB 3 NOT FCC 'NOT' FDB HERE-6 Link to HERE NOT3 LDX SP LDA SP0,X COMA STA SP0,X INCX LDA SP0,X COMA STA SP0,X JMP NEXT * FCB 2 1+ FCC '1+ ' FDB NOT3-6 Link to NOT ONEP LDX SP INCX point to low byte LDA SP0,X ADD #1 STA SP0,X LDX SP now the high byte LDA SP0,X ADC #0 STA SP0,X JMP NEXT * FCB 3 HLD FCC 'HLD' FDB ONEP-6 link to 1+ HLD3 LDA #HLD (fall through to DOUSE) * DOUSE ADD #USER Does the common part of the LDX SP execution of a user variable DECX STA SP0,X CLRA DECX STA SP0,X STX SP JMP NEXT * FCB 5 STATE FCC 'STA' FDB HLD3-6 link to HLD STA5 LDA #STATE BRA DOUSE * FCB 7 CONTEXT FCC 'CON' FDB STA5-6 link to STATE CON7 LDA #CONTEXT BRA DOUSE * FCB 7 CURRENT FCC 'CUR' FDB CON7-6 link to CONTEXT CUR7 LDA #CURRENT BRA DOUSE * FCB 5 FORTH FCC 'FOR' FDB CUR7-6 link to CURRENT FOR5 LDA #FORTH BRA DOUSE * FCB 1 ! FCC '! ' FDB FOR5-6 link to FORTH STO LDX SP move addr to Load LDA SP0,X INCX STA LOAD+1 LDA SP0,X INCX STA LOAD+2 LDA SP0,X now move data to addr INCX high byte first STX SP CLRX JSR LOAD LDX SP LDA SP0,X now the low byte INCX STX SP LDX #1 JSR LOAD JMP NEXT * FCB 2 C! FCC 'C! ' FDB STO-6 link to ! CSTO LDX SP move addr to Load LDA SP0,X INCX STA LOAD+1 LDA SP0,X INCX STA LOAD+2 INCX drop high data byte LDA SP0,X and move low byte INCX STX SP CLRX JSR LOAD JMP NEXT * FCB 1 , FCC ', ' FDB CSTO-6 link to C! COMA LDA DP move DP to Load STA LOAD+1 LDA DP+1 STA LOAD+2 LDX SP move data to DP LDA SP0,X high byte INCX STX SP CLRX JSR LOAD LDX SP low byte LDA SP0,X INCX STX SP LDX #1 JSR LOAD LDA #2 INCDP ADD DP+1 bump DP STA DP+1 LDA DP ADC #0 STA DP JMP NEXT * FCB 2 C, FCC 'C, ' FDB COMA-6 CCOMA LDA DP STA LOAD+1 LDA DP+1 STA LOAD+2 LDX SP move data to DP INCX drop high byte LDA SP0,X get low byte INCX STX SP CLRX JSR LOAD LDA #1 bump DP by 1 BRA INCDP * FCB 3 DUP FCC 'DUP' FDB CCOMA-6 link to C, DUP3 LDX SP LDA SP0,X get high byte DECX and bump SP to point to new location DECX STA SP0,X then store it LDX SP INCX get low byte LDA SP0,X DECX bump SP for it too DECX STA SP0,X and store it DECX update SP STX SP JMP NEXT * FCB 2 +! FCC '+! ' FDB DUP3-6 link to DUP PLSTO LDX SP move Addr to Load and Get LDA SP0,X INCX STA LOAD+1 STA GET+1 LDA SP0,X INCX STA LOAD+2 STA GET+2 STX SP LDX #1 get low byte of addr data JSR GET LDX SP get low byte of number INCX ADD SP0,X LDX #1 JSR LOAD and save it back CLRX The same for the high byte JSR GET LDX SP ADC SP0,X CLRX JSR LOAD INC SP update SP INC SP JMP NEXT * FCB 6 LATEST FCC 'LAT' FDB PLSTO-6 link to +! LAT6 JMP DOCOL FDB CUR7 FDB FTCH FDB FTCH FDB EXIT * FCB 5 ALLOT FCC 'ALL' FDB LAT6-6 link to LATEST ALL5 JMP DOCOL FDB DP2 FDB PLSTO FDB EXIT * FCB 3 LIT FCC 'LIT' FDB ALL5-6 LIT3 LDA IP move IP to Get STA GET+1 LDA IP+1 STA GET+2 LDX #1 move low byte to stack JSR GET LDX SP DECX STA SP0,X STX SP CLRX and then the high byte JSR GET LDX SP DECX STA SP0,X STX SP LDA #2 now bump IP ADD IP+1 STA IP+1 CLRA ADC IP STA IP JMP NEXT * QIMM LDX SP Tests for IMMEDIATE INCX using count byte LDA SP0,X from <FIND> TSTA BMI QID CLRA BRA QSKIP QID LDA #$FF QSKIP STA SP0,X DECX STA SP0,X JMP NEXT * * MESS FCB 67 FCC 'RAFOS ' FCC 'FORTH ' FCC 'V1.0' * FCB CR FCB LF FCC 'A TEAM ROSSBY PRODUCTION' * FCB CR FCB LF FCC '(C) EVERETT CARTER 1986' * LOK FCB 3 OK FCC ' OK' The FORTH prompt * * * DEFAULT OUTER INTERPRETER * * OUTER FDB COU5 FDB TYPE FDB INLINE FDB DFND FDB ZBRAN FDB $001E FDB QIMM FDB NOT3 FDB ZBRAN FDB $0010 FDB STA5 FDB FTCH FDB ZBRAN FDB $0008 FDB COMA FDB BRAN FDB $FFE6 FDB EXE7 FDB BRAN FDB $FFE0 FDB HERE FDB NUM8 FDB ZBRAN FDB $0014 FDB STA5 FDB FTCH FDB ZBRAN FDB $FFD0 FDB COMP FDB LIT3 FDB COMA FDB BRAN FDB $FFC6 FDB QUES FDB BRAN FDB $FFBA * * POWER ON RESET ROUTINE * FCB 4 COLD FCC 'COL' FDB LIT3-6 link to LIT * COLD BSET3 $05 BSET3 PUT LDX #$3F Move the default RAM data SDAT LDA ROM,X STA 0,X DECX CPX #$20 BNE SDAT LDX #$80 Move the self-modifying code SREPT LDA ROM,X to its executable location STA 0,X (done in two steps to avoid the INCX CPUs stack: 40-7F) BNE SREPT CLRX SREP2 LDA ROM+$100,X (moving 200 HEX bytes) STA $100,X DECX BNE SREP2 * * Calculate the HIGH and LOW BYTES of OUTER * HO EQU OUTER/$100*$100 LO EQU OUTER-HO HO1 EQU OUTER/$100 * LDA #LO Load the default STA START+1 Outer Interpreter LDA #HO1 into START STA START * * Calculate the HIGH and LOW BYTES of Latest entry * HCR EQU LATEST/$100*$100 LCR EQU LATEST-HCR H1CR EQU LATEST/$100 * LDA #H1CR Initialize FORTH STA USER+FORTH LDA #LCR STA USER+FORTH+1 * * * Calculate the HIGH and LOW BYTES of MESS * H EQU MESS/$100*$100 L EQU MESS-H H1 EQU MESS/$100 * CLRX LDA #L Push start up message DECX STA SP0,X LDA #H1 DECX STA SP0,X STX SP Initialize Stack Pointer WARM LDA #$80 Initialize input terminators STA TIB+$7E STA TIB+$7F CLR USER+STATE Put system in EXECUTION state CLR USER+STATE+1 CLR RP Initialize Return Stack pointer JSR CRLF LDA START Load the IP STA IP LDA START+1 STA IP+1 JMP NEXT GO... * * FCB 4 SWAP FCC 'SWA' FDB COLD-6 link to COLD SWAP LDX SP LDA SP0,X INCX STA PH LDA SP0,X INCX STA PL LDA SP0,X INCX STA QH LDA SP0,X STA QL LDA PL STA SP0,X LDA PH DECX STA SP0,X LDA QL DECX STA SP0,X LDA QH DECX STA SP0,X JMP NEXT * FCB 3 SP! FCC 'SP!' FDB SWAP-6 link to SWAP SPSTO CLR SP JMP NEXT * * * * S E R I A L I/O R O U T I N E S * * * * GETCHAR/GETC --- GET A CHARACTER FROM THE TERMINAL * * A GETS THE CHARACTER TYPED, X IS UNCHANGED * GETC STX XTEMP GETCHAR EQU GETC LDA #8 STA COUNT GETC4 CLI SEI BRSET2 PUT,GETC4 LDA PUT AND #!11 TAX LDX DELAYS,X load Baud delay GETC3 LDA #4 GETC2 DECA BNE GETC2 TSTA DECX BNE GETC3 BRSET2 PUT,GETC4 TST ,X TST ,X GETC7 BSR DELAY BRCLR2 PUT,GETC6 GETC6 TST ,X ROR CHAR DEC COUNT BNE GETC7 CLI BSR DELAY LDA CHAR AND #$7F Mask the eighth bit. LDX XTEMP RTS * * * * OUTCHAR/PUTC --- PRINT A ON THE TERMINAL * * X AND A UNCHANGED * PUTC STA CHAR OUTCHAR EQU PUTC STA ATEMP STX XTEMP LDA #9 STA COUNT CLRX CLC SEI BRA PUTC2 PUTC5 ROR CHAR PUTC2 BCC PUTC3 BSET3 PUT BRA PUTC4 PUTC3 BCLR3 PUT BRA PUTC4 PUTC4 JSR DELAY,X DEC COUNT BNE PUTC5 BSET2 PUT BSET3 PUT CLI BSR DELAY LDX XTEMP LDA ATEMP RTS * * * WAIT --- PRECISE DELAY * A AND X ARE ZERO AT EXIT. * WAIT LDA #1 ADJUST FOR FIRST TIME DELAY EQU WAIT AND #!11 TAX LDX DELAYS,X LDA #$F9 DEL3 ADD #$08 DEL2 DECA BNE DEL2 TSTX BSET1 PUT DECX BNE DEL3 LDA #0 RTS * DELAYS FCB $20 300 BAUD FCB $08 1200 BAUD FCB $01 9600 BAUD * * CRLF LDA #CR JSR OUTCHAR LDA #LF JSR OUTCHAR RTS * FCB 2 CR FCC 'CR ' FDB SPSTO-6 link to SP! CR2 BSR CRLF JMP NEXT * FCB 6 CREATE FCC 'CRE' FDB CR2-6 link to CR CRE6 JMP DOCOL FDB BL2 FDB WORD FDB LIT3 FDB #04 FDB ALL5 FDB LAT6 FDB COMA FDB CUR7 FDB FTCH FDB STO FDB EXIT * * * * ******************************************************************************** * * INTERRUPT VECTORS * ORG MEMSIZ-10 START OF VECTORS * FDB WTIME TIMER IRQ VECTOR FROM WAIT STATE FDB WTIME+3 ALTERNATE TIMER VECTOR FDB WTIME+6 IRQ VECTOR. FDB WARM SWI TO FORTH INITIALIZATION POINT FDB COLD POWER ON VECTOR * END