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ccint.txt
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ORG 0
NAM SMALL-C INTERPRETER
OPT NOP,NOG
*
* LAST UPDATE 9-SEP-82
*
JMP BEGIN START THE INTERPRETER
* AN INDIRECT CALL TABLE
NOP PUT ON A BOUNDARY OF 4
FCB 86
JMP fclose+1
FCB 86
JMP fopen+1
FCB 86
JMP getc+1
FCB 86
JMP getchar+1
FCB 86
JMP gets+1
FCB 86
JMP putc+1
FCB 86
JMP putchar+1
FCB 86
JMP puts+1
NOP
JMP RTSC
FCB 86
JMP isalpha+1
FCB 86
JMP isdigit+1
FCB 86
JMP isalnum+1
FCB 86
JMP islower+1
FCB 86
JMP isupper+1
FCB 86
JMP isspace+1
FCB 86
JMP toupper+1
FCB 86
JMP tolower+1
FCB 86
JMP strclr+1
FCB 86
JMP strlen+1
FCB 86
JMP strcpy+1
FCB 86
JMP strcat+1
FCB 86
JMP strcmp+1
RMB 4*4 ROOM FOR 4 MORE
LIB FLEXPTRS
NFILES EQU 4 MAX NO OF DISK FILES OPEN AT ONCE
PC RMB 2 PSEUDO PROGRAM COUNTER
R1A RMB 1 WORKING 16 BIT
R1B RMB 1 --REGISTER
DFLAG FCB NFILES-1 DIVIDE ROUTINE FLAG
STEMP RMB 2 TEMP STORAGE FOR STACK POINTER
X1TMP RMB 2 TEMP STORAGE FOR X REG
X2TMP RMB 2 ... DITTO ...
FCBPTR RMB 2 POINTER INTO FCB TABLE
FCBTBL FDB FCB TABLE OF FCB POINTERS
RMB NFILES*2 ROOM FOR THE REST
***************************************************
BEGIN LDX #FCBTBL+2 POINT TO FCB ADDRESSES
LDA A #NFILES-1
STA A DFLAG INIT COUNTER
LDA A $AC2B GET TOP OF MEMORY
LDA B $AC2C
BLOOP SUB B #$40 SUBTR 320 (SIZE OF FCB)
SBC A #1
STA A 0,X SAVE FCB ADDRESS
INX
STA B 0,X
INX
DEC DFLAG DONE ???
BNE BLOOP
CLR 0,X MARK END OF TABLE
CLR 1,X
STA A STEMP TOP OF STACK AREA
STA B STEMP+1
LDX STEMP
TXS SET STACK POINTER
LDX #FCBTBL POINT TO TABLE OF FCB ADDRESSES
Init STX FCBPTR
LDX 0,X GET FCB ADDRESS
BEQ Initend QUIT IF END OF TABLE
CLR 2,X MARK AS NOT IN USE
LDX FCBPTR
INX
INX
BRA Init
Initend LDX #$800
BRA NEXT2 START THE INTERPRETATION
**************************************************************
*
* THE HEART OF THE INTERPRETER--- NEXT INSTRUCTION FETCHER.
*
BUMP2 LDX PC GET PROG COUNTER
BUMP2A INX INCR BY 2
INX
BRA NEXT1 FETCH NEXT INSTRUCTION
NEXT LDX PC
NEXT1 STA A R1A SAVE THE WORK
STA B R1B --REGISTER
NEXT2 LDA B 0,X GET THE PSEUDO-INSTRUCTION
INX (B CONTAINS A TABLE OFFSET)
STX PC SAVE NEW PC
STA B JJJ+2 SAVE AS PAGE OFFSET
LDA B R1B RESTORE
JJJ LDX JTABLE POINT TO ROUTINE (SELF MODIFYING CODE)
JMP 0,X GO EXECUTE THE PSEUDO-INSTR.
**************************************************************
* THE JUMP TABLE *
**************************************************************
ORG *+255/256*256 MUST START ON A PAGE BOUNDARY
JTABLE FDB LD1IM #0
FDB LD1SOFF #1
FDB LD1 #2
FDB LDB1 #3
FDB LD1R #4
FDB LDB1R #5
FDB ST1 #6
FDB STB1 #7
FDB ST1SP #8
FDB STB1SP #9
FDB PUSHR1 #10
FDB EXG1 #11
FDB JMPL #12
FDB BRZL #13
FDB JSRL #14
FDB JSRSP #15
FDB RTSC #16
FDB MODSP #17
FDB DBL1 #18
FDB ADDS #19
FDB SUBFST #20
FDB MUL1 #21
FDB DIV1 #22
FDB MOD #23
FDB ORS #24
FDB XORS #25
FDB ANDS #26
FDB ASRS #27
FDB ASLS #28
FDB NEGR #29
FDB NOTR #30
FDB INCR #31
FDB DECR #32
FDB ZEQ #33
FDB ZNE #34
FDB ZLT #35
FDB ZLE #36
FDB ZGT #37
FDB ZGE #38
FDB ULT #39
FDB ULE #40
FDB UGT #41
FDB UGE #42
FDB ASMC #43
*************************************************************
*-------------------------
* #0 LOAD REG WITH IMMED. VALUE
LD1IM LDX PC
LDA A 0,X HIGH BYTE
LDA B 1,X LOW BYTE
JMP BUMP2A
*-------------------------
* #1 LOAD STACK ADDRESS + OFFSET INTO REG
LD1SOFF STS R1A SAVE STACK VALUE
LDX PC
LDA A 0,X GET OFFSET
LDA B 1,X -- VALUE
SEC
ADC B R1B ADD OFFSET + 1
ADC A R1A
JMP BUMP2A
*-------------------------
* #2 LOAD WORD @ ADDRESS
LD1 LDX PC
LDX 0,X GET ADDRESS
LD1A LDA A 0,X GET WORD
LDA B 1,X
JMP BUMP2
*-------------------------
* #3 LOAD BYTE @ ADDRESS
LDB1 LDX PC
LDX 0,X GET ADDRESS
CLR A
LDA B 0,X GET BYTE
BPL LDB1A
COM A SIGN EXTEND
LDB1A JMP BUMP2
*-------------------------
* #4 LOAD WORD INDIRECT (ADDR IN REG)
LD1R LDX R1A GET ADDRESS
LDA A 0,X GET WORD
LDA B 1,X
JMP NEXT
*-------------------------
* #5 LOAD BYTE INDIRECT (ADDR IN REG)
LDB1R LDX R1A
CLR A
LDA B 0,X GET BYTE
BPL LDB1RA
COM A
LDB1RA JMP NEXT
*-------------------------
* #6 STORE WORD @ ADDRESS
ST1 LDX PC
LDX 0,X GET ADDRESS
STA A 0,X STORE WORD
STA B 1,X
JMP BUMP2
*-------------------------
* #7 STORE BYTE @ ADDRESS
STB1 LDX PC
LDX 0,X GET ADDR
STA B 0,X STORE BYTE
JMP BUMP2
*-------------------------
* #8 STORE WORD @ ADDRESS ON STACK
ST1SP TSX STACK TO INDEX
LDX 0,X GET ADDRESS
STA A 0,X STORE WORD
STA B 1,X
INS
INS POP STACK
JMP NEXT
*-------------------------
* #9 STORE BYTE @ ADDRESS ON STACK
STB1SP TSX
LDX 0,X
STA B 0,X STORE BYTE
INS POP ...
INS
JMP NEXT
*-------------------------
* #10 PUSH WORD ON STACK
PUSHR1 PSH B
PSH A
LDX PC
JMP NEXT2
*-------------------------
* #11 SWAP REG AND TOP OF STACK
EXG1 TSX
LDX 0,X GET VALUE ON STACK
STX R1A SAVE
INS
INS
PSH B
PSH A REG ON STACK
LDA A R1A NEW REG
LDA B R1B
LDX PC
JMP NEXT2
*-------------------------
* #12 JUMP TO LABEL
JMPL LDX PC
JMP1 LDX 0,X GET ADDRESS (NEW PC)
JMP NEXT2
*-------------------------
* #13 JUMP TO LABEL IF FALSE
BRZL ORA A R1B SET FLAGS
BEQ JMPL IF REG=0 -- JUMP
JMP BUMP2 ELSE, PROCEED
*-------------------------
* #14 CALL TO LABEL
JSRL LDX PC
INX ADJUST RETURN
INX -- ADDRESS
DES
STS *+5 *** SELF MODIFYING CODE ***
DES
STX $FFFF PUSH RETURN ADDRESS
BRA JMPL
*-------------------------
* #15 CALL TO TOP OF STACK
JSRSP TSX POINT TO STACK
LDX 0,X GET ADDRESS (NEW PC)
INS POP
INS
LDA B PC+1 GET RETURN ADDRESS
PSH B
LDA B PC
PSH B SAVE RETURN ADDRESS
JMP NEXT2
*-------------------------
* #16 RETURN TO CALLER
RTSC TSX
LDX 0,X GET ADDRESS
INS POP
INS
JMP NEXT1
*-------------------------
* #17 MODIFY THE STACK POINTER
MODSP LDX PC
LDA A 0,X GET VALUE
LDA B 1,X
STS STEMP
ADD B STEMP+1 ADD STACK POINTER
ADC A STEMP
STA A STEMP
STA B STEMP+1
LDS STEMP NEW STACK POINTER
LDA A R1A RESTORE REGISTER
LDA B R1B
JMP BUMP2A
*---------------------------
* #18 DOUBLE THE PRIMARY REGISTER
DBL1 ASL B
ROL A
JMP NEXT
*---------------------------
* #19 ADD REG AND TOP OF STACK (THEN POP)
ADDS TSX
ADD B 1,X DO THE ADD
ADC A 0,X
JMP POPS POP & RETURN
*---------------------------
* #20 SUBTRACT REG FROM TOP OF STACK
SUBFST PUL A GET VALUE OFF STACK
PUL B
SUB B R1B SUBTRACT REGISTER
SBC A R1A
JMP NEXT
*---------------------------
* #21 MULTIPLY TOP OF STACK BY REG (RESULT IN REG)
MUL1 PSH B
PSH A REG ON STACK
LDA A #16
PSH A SET COUNTER
CLR A
CLR B
TSX POINT TO DATA
M2 ROR 3,X SHIFT MULTIPLIER
ROR 4,X
DEC 0,X DONE ?
BMI M4
BCC M3
ADD B 2,X
ADC A 1,X
M3 ROR A
ROR B SHIFT RESULT
BRA M2 AND LOOP
M4 INS CLEAN STACK
INS
INS
PUL A GET RESULT
PUL B
JMP NEXT
*-----------------------------
* #22 DIVIDE THE TOP OF STACK BY REG --- RESULT IN REG.
DIV1 BSR BDIV DO THE BASIC DIVIDE
LDA A DFLAG GET SIGN FLAG
AND A #1 MASK OFF BIT ZERO
PUL A GET RESULT
PUL B
BEQ DIV1R
DIV1N BSR NEGATE NEGATE THE VALUE IN A,B
DIV1R JMP NEXT
*-----------------------------
* #23 DIVIDE TOP OF STACK BY REG --- REMAINDER IN REG
MOD BSR BDIV
INS CLEAN STACK
INS
PSH A TEMP SAVE
LDA A DFLAG GET SIGN FLAG
BPL MOD1
COM A
MOD1 AND A #1 MASK OFF BIT 0
PUL A
BNE DIV1N IF BIT 0 SET, NEGATE
JMP NEXT
*****************************************************
* BASIC 16 BIT DIVIDE ROUTINE
* ENTER WITH: DIVIDEND ON STACK
* DIVISOR IN A,B
* EXIT WITH: QUOTIENT ON STACK
* REMAINDER IN A,B
* SIGN FLAG IN DFLAG
*
BDIV CLR DFLAG
TST A CHECK DIVISOR SIGN
BPL BDIV1
INC DFLAG ADJUST SIGN FLAG
BSR NEGATE TAKE ABSOLUTE VALUE
BDIV1 PSH B FORCE ON STACK
PSH A
LDA A #17 BIT COUNTER
PSH A
TSX POINT TO DATA
LDA A 5,X CHECK SIGN
BPL BDIV2 -- OF DIVIDEND
COM DFLAG ADJUST FLAG
LDA B 6,X
BSR NEGATE
STA A 5,X
STA B 6,X
BDIV2 CLR A
CLR B
* MAIN DIVIDE LOOP (UNSIGNED)
UDIV1 CMP A 1,X
BHI UDIV3
BCS UDIV2
CMP B 2,X
BCC UDIV3
UDIV2 CLC
BRA UDIV4
UDIV3 SUB B 2,X
SBC A 1,X
SEC
UDIV4 ROL 6,X
ROL 5,X
DEC 0,X
BEQ UDIV5
ROL B
ROL A
BCC UDIV1
BRA UDIV3
UDIV5 INS
INS
INS
RTS
*----------------------------------------
* NEGATE THE VALUE IN A,B
NEGATE COM A
COM B
ADD B #1
ADC A #0
RTS
*----------------------------------
* #24 INCLUSIVE OR THE TOP OF STACK AND REG.
ORS TSX
ORA A 0,X
ORA B 1,X
POPS INS POP THE STACK
INS
JMP NEXT
*----------------------------------
* #25 EXCLUSIVE OR ......
XORS TSX
EOR A 0,X
EOR B 1,X
BRA POPS
*----------------------------------
* #26 AND .........
ANDS TSX
AND A 0,X
AND B 1,X
BRA POPS
*----------------------------------
* #27 ARITH. SHIFT RIGHT THE TOP OF STACK
ASRS TSX
AND B #$1F MAX REASONABLE SHIFT
BEQ ASRS2
ASRS1 ASR 0,X
ROR 1,X
DEC B
BNE ASRS1
ASRS2 PUL A GET THE RESULT
PUL B
JMP NEXT
*--------------------------------
* #28 ARITH. SHIFT LEFT THE TOP OF STACK
ASLS TSX
AND B #$1F
BEQ ASRS2
ASLS1 ASL 1,X
ROL 0,X
DEC B
BNE ASLS1
BRA ASRS2
*--------------------------------
* #29 NEGATE THE REGISTER
NEGR BSR NEGATE
JMP NEXT
*--------------------------------
* #30 COMPLEMENT THE REGISTER
NOTR COM A
COM B
JMP NEXT
*--------------------------------
* #31 ADD 1 TO REG
INCR ADD B #1
ADC A #0
JMP NEXT
*--------------------------------
* #32 SUBTRACT 1 FROM REG
DECR SUB B #1
SBC A #0
JMP NEXT
*****************************************************
*
* BASIC COMPARE INSTRUCTION SUBROUTINE
* Compare the top of Stack to Register and set Condition codes
*
* Signed compare -- Carry reflects the sign of difference
* (set means: top of stack < A,B )
*
SCMP TSX
LDA A 2,X GET TOP OF STACK
LDA B 3,X
SUB B R1B SET CONDITION
SBC A R1A ... FLAGS
BPL STCMP1 SKIP IF PLUS
STA B R1B TEMP SAVE
ORA A R1B SET/RESET ZERO FLAG
SEC AND SET CARRY
RTS
STCMP1 STA B R1B
ORA A R1B
CLC CLEAR THE CARRY
RTS
*
* Unsigned compare, Carry set if top of stack < A,B
*
BCMP TSX
LDA A 2,X GET TOP OF STACK
LDA B 3,X
CMP A R1A CHECK TOP BYTE
BNE BCMP1
CMP B R1B
BCMP1 RTS
*-------------------------------
* #33 TEST FOR EQUALITY
ZEQ BSR BCMP
BEQ TRUE
BRA FALSE
*-------------------------------
* #34 TEST FOR NOT-EQUAL
ZNE BSR BCMP
BNE TRUE
BRA FALSE
*-------------------------------
* #35 TEST FOR LESS THAN
ZLT BSR SCMP
BCS TRUE
BRA FALSE
*-------------------------------
* #36 TEST FOR LESS THAN OR EQUAL
ZLE BSR SCMP
BLS TRUE
BRA FALSE
*-------------------------------
* #37 TEST FOR GREATER THAN
ZGT BSR SCMP
BHI TRUE
BRA FALSE
*-------------------------------
* #38 TEST FOR GREATER THAN OR EQUAL
ZGE BSR SCMP
BCC TRUE
BRA FALSE
*-------------------------------
* #39 TEST FOR LESS THAN (UNSIGNED)
ULT BSR BCMP
BCS TRUE
BRA FALSE
*-------------------------------
* #40 TEST FOR LESS THAN OR EQUAL (UNSIGNED)
ULE BSR BCMP
BLS TRUE
BRA FALSE
*-------------------------------
* #41 TEST FOR GREATER THAN (UNSIGNED)
UGT BSR BCMP
BHI TRUE
BRA FALSE
*------------------------------
* #42 TEST FOR GREATER THAN OR EQUAL (UNSIGNED)
UGE BSR BCMP
BCC TRUE
FALSE CLR B RETURN FALSE
BRA TRUE1
TRUE LDA B #1 RETURN TRUE
TRUE1 CLR A
JMP POPS POP STACK AND PROCEED
*-------------------------------------
* #43 SWITCH TO EXECUTABLE (ASSEMBLY) CODE
ASMC LDX PC POINT TO CODE
JMP 0,X GO EXECUTE IT
***********************************************************
*
* RUN-TIME SUBROUTINE LIBRARY
*
***********************************************************
* fopen(file-name, "type")
* Open a File..........
fopen FCB 86 SWITCH TO INLINE CODE
LDX #FCBTBL-2 POINT TO FCB ADDRESSES TABLE
NXTFIL INX
INX
STX FCBPTR SAVE POINTER
LDX 0,X GET FCB ADDRESS
BEQ NOFILE
TST 2,X BUSY ?
BEQ GODOIT NO,
LDX FCBPTR ELSE, NEXT IN LINE
BRA NXTFIL
NOFILE LDX #FMSG POINT TO MESSAGE
JSR PSTRNG PRINT IT
JMP WARMS --AND BACK TO FLEX
GODOIT STX R1A SAVE FCB ADDRESS
TSX
LDX 4,X POINT TO FILE NAME
STX $AC14 SAVE IN LINE BUFFER POINTER
LDX R1A GET FCB POINTER
JSR GETFIL GET FILE SPEC
BCS FERROR REPORT IF ERROR
TSX
LDX 2,X POINT TO MODE
LDA A #1
LDA B #'w' OPEN FOR WRITE
CMP B 0,X -- ????
BEQ OWRITE YES,
* DEFAULT TO OPEN FOR READ
LDX R1A POINT TO FCB
STA A 0,X STORE IN FCB
JSR FMS DO THE OPEN
BEQ FEXIT
FERROR JSR RPTERR REPORT THE TYPE OF ERROR
JSR FMSCLS CLOSE ALL OPEN FILES
JMP WARMS RETURN TO FLEX
* OK, OPEN FOR WRITE
OWRITE LDA A #2 CODE FOR WRITE
LDX R1A GET FCB ADDRESS
STA A 0,X
JSR FMS TRY AN OPEN
BEQ FEXIT IF SUCCESSFULL--DONE
LDA A 1,X GET ERROR STATUS
CMP A #3 ALREADY EXISTS ?
BNE FERROR NO--SOME OTHER ERROR
LDA A #12 DELETE THE EXISTING FILE
STA A 0,X
JSR FMS
BNE FERROR
LDA A 36,X FIX NAME
STA A 4,X
BRA OWRITE
FEXIT TSX
LDX 2,X POINT TO MODE AGAIN
LDA B 1,X GET OPTIONAL CHAR
CMP B #'u UNCOMPRESSED (BINARY) ???
BNE FEXIT1 NO, SO SKIP
LDA B #$FF
LDX R1A
STA B 59,X SET FLAG IN FCB
FEXIT1 LDA A R1A RETURN THE FCB POINTER
LDA B R1B
JMP RTSC RETURN TO INTERPRETER
*-------------------------------------------------
* fclose(unit)
* CLOSE A FILE
fclose FCB 86 SWITCH TO IN-LINE
TSX
LDX 2,X POINT TO FCB
LDA A #4 CLOSE CODE
STA A 0,X
JSR FMS DO THE CLOSE
BNE FERROR
CLR A
LDA B #1 OK CODE
JMP RTSC RETURN TO INTERPRETER....
*--------------------------------------------------
* getc(unit) read a byte from file
* return a char, else a -1 if EOF
getc FCB 86
TSX
LDX 2,X POINT TO FCB
JSR FMS GET BYTE
BEQ CHOK
LDA A 1,X GET ERROR
CMP A #8 EOF ?
BNE FERROR
LDA A #$FF LOAD EOF INDICATOR
CHOK TAB COPY CHAR IN A
CHOK1 CLR A
TST B
BPL GETC1
COM A SIGN EXTEND
GETC1 JMP RTSC
*----------------------------------------------
* putc(c,unit) write to file
putc FCB 86
TSX
LDA A 5,X GET CHAR
LDX 2,X GET FCB ADDR
PSH A SAVE CHAR
JSR FMS
BNE FERROR
PUL B GET CHAR
BRA CHOK1
*-----------------------------------------------
FMSG FCC 'NO MORE FILES MAY BE OPENED.'
FCB $0D,$0A,4
*-----------------------------------------------
* getchar() get a char from standard input
getchar FCB 86
JSR GETCHR
CMP A #$0D CR ???
BEQ GETCH1 SKIP IF TRUE
CMP A #$1A COMPARE TO CNTRL-Z (EOF)
BNE CHOK NO
LDA B #$FF YES...
BRA CHOK1 RETURN -1
GETCH1 LDA A #$0A LOAD A LF
JSR PUTCHR ECHO IT
LDA B #$0D
BRA CHOK1
*-----------------------------------------------
* putchar(c) write a char to standard output
putchar FCB 86
TSX
LDA A 3,X GET THE CHAR
PSH A SAVE CHAR
CMP A #$0D IS IT A CR ?
BEQ PUTC2 YES, SKIP
JSR PUTCHR ELSE, OUTPUT IT
PUTC1 PUL B RESTORE CHAR
BRA CHOK1
PUTC2 JSR PCRLF OUTPUT CR/LF PAIR
BRA PUTC1
*----------------------------------------------
* gets(buffer) get a char string into buffer
gets FCB 86
TSX
LDX 2,X GET START OF BUFFER
CLR B
GETS1 JSR GETCHR READ A CHAR
CMP A $AC00 BACKSPACE ?
BNE GETS2
LDA A #$20
JSR PUTCHR
LDA A #$08
JSR PUTCHR
TST B BEGINNING OF LINE ?
BEQ GETS1 YES,
DEC B ELSE,
DEX ADJUST LINE POINTER
BRA GETS1
GETS2 CMP A $AC01 DELETE LINE CHAR ?
BNE GETS3
LDA A #$0D CR...
JSR PUTCHR
LDA A #$0A LF...
JSR PUTCHR
BRA gets+1 GO TRY AGAIN....
GETS3 STA A 0,X GOOD CHAR--STORE IN BUFFER
INX AND BUMP POINTER
INC B AND COUNTER
CMP A #$0D IS IT A CR ?
BNE GETS1 NO
DEX
CLR 0,X MARK END OF STRING WITH A NULL
STX R1A SAVE POINTER VALUE
LDA A R1A GET IT INTO WORK
LDA B R1B .. REG
TSX
SUB B 3,X RETURN LENGTH
SBC A 2,X --OF BUFFER
GETS4 JMP RTSC
*----------------------------------------------
* puts(string) print a string on the terminal
puts FCB 86
TSX
LDX 2,X GET STRING ADDRESS
PLOOP LDA A 0,X GET THE CHAR
BEQ GETS4 IF END OF STRING--QUIT
CMP A #'\ SPECIAL CHAR ?
BNE PLOOP1 NO, SKIP
BSR SPECIAL YES, INTERPRET
CMP A #$0D IS IT A CR (NEWLINE)
BNE PLOOP1 NO--SKIP
JSR PCRLF YES PRINT CR/LF PAIR
BRA PLOOP2
PLOOP1 JSR PUTCHR PRINT IT
PLOOP2 INX BUMP POINTER
BRA PLOOP
* This subroutine interprets the backslash (\) sequence.
SPECIAL INX
LDA A 0,X GET NEXT CHAR
CMP A #'b
BNE SP1
LDA A #08 BACKSPACE
BRA SPEXIT
SP1 CMP A #'f
BNE SP2
LDA A #$0C FORMFEED
BRA SPEXIT
SP2 CMP A #'n
BNE SP3
LDA A #$0D NEWLINE
BRA SPEXIT
SP3 CMP A #'\ BACKSLASH
BEQ SPEXIT
CMP A #'' SINGLE QUOTE
BEQ SPEXIT
CMP A #'" DOUBLE QUOTE
BEQ SPEXIT
CMP A #'x START OF HEX SEQUENCE
BEQ SPHEX
CMP A #'0 OCTAL SEQUENCE ?
BLT SPERR
CMP A #'7
BLE SPOCTAL YES
SPERR DEX BACKUP THE POINTER
LDA A 0,X RESTORE CHAR
SPEXIT RTS RETURN
SPOCTAL LDA B #3
STA B DFLAG SAVE COUNTER
CLR B
SPOCT1 SUB A #'0 CONVERT TO DIGIT
ASL B SHIFT ACCUM
ASL B
ASL B
ABA ADD IN NEW DIGIT
TAB SAVE
DEC DFLAG
BEQ SPBYE IF MAX COUNT--EXIT
INX
LDA A 0,X GET NEXT CHAR
CMP A #'0 VERIFY IF OCTAL
BLT SPFINI
CMP A #'7
BLE SPOCT1 YES, CONTINUE
SPFINI DEX BACKUP
SPBYE TBA GET ACCUM CHAR
RTS
SPHEX LDA B #2
STA B DFLAG
CLR B
SPHEXL INX
LDA A 0,X GET NEXT CHAR
CMP A #'0 VERIFY IF HEX
BLT SPFINI ..
CMP A #'9 ..
BLE SPHEX2 ..
CMP A #'A ..
BLT SPFINI ..
CMP A #'F ..
BLE SPHEX1 ..
CMP A #'a ..
BLT SPFINI ..
CMP A #'f ..
BGT SPFINI ..
SUB A #$20 YES IT IS HEX