S-C DocuMentor — Applesoft
SAVE S.ED0A
1010 *--------------------------------
ED0A- 9B 3E BC
ED0D- 1F FD 1020 CON.99999999.9 .HS 9B3EBC1FFD 99,999,999.9
ED0F- 9E 6E 6B
ED12- 27 FD 1030 CON.999999999 .HS 9E6E6B27FD 999,999,999
ED14- 9E 6E 6B
ED17- 28 00 1040 CON.BILLION .HS 9E6E6B2800 1,000,000,000
1050 *--------------------------------
1060 * PRINT "IN <LINE #>"
1070 *--------------------------------
ED19- A9 58 1080 INPRT LDA #QT.IN PRINT " IN "
ED1B- A0 D3 1090 LDY /QT.IN
ED1D- 20 31 ED 1100 JSR GO.STROUT
ED20- A5 76 1110 LDA CURLIN+1
ED22- A6 75 1120 LDX CURLIN
1130 *--------------------------------
1140 * PRINT A,X AS DECIMAL INTEGER
1150 *--------------------------------
ED24- 85 9E 1160 LINPRT STA FAC+1 PRINT A,X IN DECIMAL
ED26- 86 9F 1170 STX FAC+2
ED28- A2 90 1180 LDX #$90 EXPONENT = 2^16
ED2A- 38 1190 SEC CONVERT UNSIGNED
ED2B- 20 A0 EB 1200 JSR FLOAT.2 CONVERT LINE # TO FP
1210 *--------------------------------
1220 * CONVERT (FAC) TO STRING, AND PRINT IT
1230 *--------------------------------
1240 PRINT.FAC
ED2E- 20 34 ED 1250 JSR FOUT CONVERT (FAC) TO STRING AT STACK
1260 *--------------------------------
1270 * PRINT STRING STARTING AT Y,A
1280 *--------------------------------
1290 GO.STROUT
ED31- 4C 3A DB 1300 JMP STROUT PRINT STRING AT A,Y
1310 *--------------------------------
1320 * CONVERT (FAC) TO STRING STARTING AT STACK
1330 * RETURN WITH (Y,A) POINTING AT STRING
1340 *--------------------------------
ED34- A0 01 1350 FOUT LDY #1 NORMAL ENTRY PUTS STRING AT STACK...
1360 *--------------------------------
1370 * "STR$" FUNCTION ENTERS HERE, WITH (Y)=0
1380 * SO THAT RESULT STRING STARTS AT STACK-1
1390 * (THIS IS USED AS A FLAG)
1400 *--------------------------------
ED36- A9 2D 1410 FOUT.1 LDA #'-' IN CASE VALUE NEGATIVE
ED38- 88 1420 DEY BACK UP PNTR
ED39- 24 A2 1430 BIT FAC.SIGN
ED3B- 10 04 1440 BPL .1 VALUE IS +
ED3D- C8 1450 INY VALUE IS -
ED3E- 99 FF 00 1460 STA STACK-1,Y EMIT "-"
ED41- 85 A2 1470 .1 STA FAC.SIGN MAKE FAC.SIGN POSITIVE ($2D)
ED43- 84 AD 1480 STY STRNG2 SAVE STRING PNTR
ED45- C8 1490 INY
ED46- A9 30 1500 LDA #'0' IN CASE (FAC)=0
ED48- A6 9D 1510 LDX FAC NUMBER=0?
ED4A- D0 03 1520 BNE .2 NO, (FAC) NOT ZERO
ED4C- 4C 57 EE 1530 JMP FOUT.4 YES, FINISHED
1540 *--------------------------------
ED4F- A9 00 1550 .2 LDA #0 STARTING VALUE FOR TMPEXP
ED51- E0 80 1560 CPX #$80 ANY INTEGER PART?
ED53- F0 02 1570 BEQ .3 NO, BTWN .5 AND .999999999
ED55- B0 09 1580 BCS .4 YES
1590 *--------------------------------
ED57- A9 14 1600 .3 LDA #CON.BILLION MULTIPLY BY 1E9
ED59- A0 ED 1610 LDY /CON.BILLION TO GIVE ADJUSTMENT A HEAD START
ED5B- 20 7F E9 1620 JSR FMULT
ED5E- A9 F7 1630 LDA #-9 EXPONENT ADJUSTMENT
ED60- 85 99 1640 .4 STA TMPEXP 0 OR -9
1650 *--------------------------------
1660 * ADJUST UNTIL 1E8 <= (FAC) <1E9
1670 *--------------------------------
ED62- A9 0F 1680 .5 LDA #CON.999999999
ED64- A0 ED 1690 LDY /CON.999999999
ED66- 20 B2 EB 1700 JSR FCOMP COMPARE TO 1E9-1
ED69- F0 1E 1710 BEQ .10 (FAC) = 1E9-1
ED6B- 10 12 1720 BPL .8 TOO LARGE, DIVIDE BY TEN
ED6D- A9 0A 1730 .6 LDA #CON.99999999.9 COMPARE TO 1E8-.1
ED6F- A0 ED 1740 LDY /CON.99999999.9
ED71- 20 B2 EB 1750 JSR FCOMP COMPARE TO 1E8-.1
ED74- F0 02 1760 BEQ .7 (FAC) = 1E8-.1
ED76- 10 0E 1770 BPL .9 IN RANGE, ADJUSTMENT FINISHED
ED78- 20 39 EA 1780 .7 JSR MUL10 TOO SMALL, MULTIPLY BY TEN
ED7B- C6 99 1790 DEC TMPEXP KEEP TRACK OF MULTIPLIES
ED7D- D0 EE 1800 BNE .6 ...ALWAYS
ED7F- 20 55 EA 1810 .8 JSR DIV10 TOO LARGE, DIVIDE BY TEN
ED82- E6 99 1820 INC TMPEXP KEEP TRACK OF DIVISIONS
ED84- D0 DC 1830 BNE .5 ...ALWAYS
1840 *--------------------------------
ED86- 20 A0 E7 1850 .9 JSR FADDH ROUND ADJUSTED RESULT
ED89- 20 F2 EB 1860 .10 JSR QINT CONVERT ADJUSTED VALUE TO 32-BIT INTEGER
1870 *--------------------------------
1880 * FAC+1...FAC+4 IS NOW IN INTEGER FORM
1890 * WITH POWER OF TEN ADJUSTMENT IN TMPEXP
1900 *
1910 * IF -10 < TMPEXP > 1, PRINT IN DECIMAL FORM
1920 * OTHERWISE, PRINT IN EXPONENTIAL FORM
1930 *--------------------------------
ED8C- A2 01 1940 FOUT.2 LDX #1 ASSUME 1 DIGIT BEFORE "."
ED8E- A5 99 1950 LDA TMPEXP CHECK RANGE
ED90- 18 1960 CLC
ED91- 69 0A 1970 ADC #10
ED93- 30 09 1980 BMI .1 < .01, USE EXPONENTIAL FORM
ED95- C9 0B 1990 CMP #11
ED97- B0 06 2000 BCS .2 >= 1E10, USE EXPONENTIAL FORM
ED99- 69 FF 2010 ADC #$FF LESS 1 GIVES INDEX FOR "."
ED9B- AA 2020 TAX
ED9C- A9 02 2030 LDA #2 SET REMAINING EXPONENT = 0
ED9E- 38 2040 .1 SEC COMPUTE REMAINING EXPONENT
ED9F- E9 02 2050 .2 SBC #2
EDA1- 85 9A 2060 STA EXPON VALUE FOR "E+XX" OR "E-XX"
EDA3- 86 99 2070 STX TMPEXP INDEX FOR DECIMAL POINT
EDA5- 8A 2080 TXA SEE IF "." COMES FIRST
EDA6- F0 02 2090 BEQ .3 YES
EDA8- 10 13 2100 BPL .5 NO, LATER
EDAA- A4 AD 2110 .3 LDY STRNG2 GET INDEX INTO STRING BEING BUILT
EDAC- A9 2E 2120 LDA #'.' STORE A DECIMAL POINT
EDAE- C8 2130 INY
EDAF- 99 FF 00 2140 STA STACK-1,Y
EDB2- 8A 2150 TXA SEE IF NEED ".0"
EDB3- F0 06 2160 BEQ .4 NO
EDB5- A9 30 2170 LDA #'0' YES, STORE "0"
EDB7- C8 2180 INY
EDB8- 99 FF 00 2190 STA STACK-1,Y
EDBB- 84 AD 2200 .4 STY STRNG2 SAVE OUTPUT INDEX AGAIN
2210 *--------------------------------
2220 * NOW DIVIDE BY POWERS OF TEN TO GET SUCCESSIVE DIGITS
2230 *--------------------------------
EDBD- A0 00 2240 .5 LDY #0 INDEX TO TABLE OF POWERS OF TEN
EDBF- A2 80 2250 LDX #$80 STARTING VALUE FOR DIGIT WITH DIRECTION
EDC1- A5 A1 2260 .6 LDA FAC+4 START BY ADDING -100000000 UNTIL
EDC3- 18 2270 CLC OVERSHOOT. THEN ADD +10000000,
EDC4- 79 6C EE 2280 ADC DECTBL+3,Y THEN ADD -1000000, THEN ADD
EDC7- 85 A1 2290 STA FAC+4 +100000, AND SO ON.
EDC9- A5 A0 2300 LDA FAC+3 THE # OF TIMES EACH POWER IS ADDED
EDCB- 79 6B EE 2310 ADC DECTBL+2,Y IS 1 MORE THAN CORRESPONDING DIGIT
EDCE- 85 A0 2320 STA FAC+3
EDD0- A5 9F 2330 LDA FAC+2
EDD2- 79 6A EE 2340 ADC DECTBL+1,Y
EDD5- 85 9F 2350 STA FAC+2
EDD7- A5 9E 2360 LDA FAC+1
EDD9- 79 69 EE 2370 ADC DECTBL,Y
EDDC- 85 9E 2380 STA FAC+1
EDDE- E8 2390 INX COUNT THE ADD
EDDF- B0 04 2400 BCS .7 IF C=1 AND X NEGATIVE, KEEP ADDING
EDE1- 10 DE 2410 BPL .6 IF C=0 AND X POSITIVE, KEEP ADDING
EDE3- 30 02 2420 BMI .8 IF C=0 AND X NEGATIVE, WE OVERSHOT
EDE5- 30 DA 2430 .7 BMI .6 IF C=1 AND X POSITIVE, WE OVERSHOT
EDE7- 8A 2440 .8 TXA OVERSHOT, SO MAKE X INTO A DIGIT
EDE8- 90 04 2450 BCC .9 HOW DEPENDS ON DIRECTION WE WERE GOING
EDEA- 49 FF 2460 EOR #$FF DIGIT = 9-X
EDEC- 69 0A 2470 ADC #10
EDEE- 69 2F 2480 .9 ADC #'0'-1 MAKE DIGIT INTO ASCII
EDF0- C8 2490 INY ADVANCE TO NEXT SMALLER POWER OF TEN
EDF1- C8 2500 INY
EDF2- C8 2510 INY
EDF3- C8 2520 INY
EDF4- 84 83 2530 STY VARPNT SAVE PNTR TO POWERS
EDF6- A4 AD 2540 LDY STRNG2 GET OUTPUT PNTR
EDF8- C8 2550 INY STORE THE DIGIT
EDF9- AA 2560 TAX SAVE DIGIT, HI-BIT IS DIRECTION
EDFA- 29 7F 2570 AND #$7F MAKE SURE $30...$39 FOR STRING
EDFC- 99 FF 00 2580 STA STACK-1,Y
EDFF- C6 99 2590 DEC TMPEXP COUNT THE DIGIT
EE01- D0 06 2600 BNE .10 NOT TIME FOR "." YET
EE03- A9 2E 2610 LDA #'.' TIME, SO STORE THE DECIMAL POINT
EE05- C8 2620 INY
EE06- 99 FF 00 2630 STA STACK-1,Y
EE09- 84 AD 2640 .10 STY STRNG2 SAVE OUTPUT PNTR AGAIN
EE0B- A4 83 2650 LDY VARPNT GET PNTR TO POWERS
EE0D- 8A 2660 TXA GET DIGIT WITH HI-BIT = DIRECTION
EE0E- 49 FF 2670 EOR #$FF CHANGE DIRECTION
EE10- 29 80 2680 AND #$80 $00 IF ADDING, $80 IF SUBTRACTING
EE12- AA 2690 TAX
EE13- C0 24 2700 CPY #DECTBL.END-DECTBL
EE15- D0 AA 2710 BNE .6 NOT FINISHED YET
2720 *--------------------------------
2730 * NINE DIGITS HAVE BEEN STORED IN STRING. NOW LOOK
2740 * BACK AND LOP OFF TRAILING ZEROES AND A TRAILING
2750 * DECIMAL POINT.
2760 *--------------------------------
EE17- A4 AD 2770 FOUT.3 LDY STRNG2 POINTS AT LAST STORED CHAR
EE19- B9 FF 00 2780 .1 LDA STACK-1,Y SEE IF LOPPABLE
EE1C- 88 2790 DEY
EE1D- C9 30 2800 CMP #'0' SUPPRESS TRAILING ZEROES
EE1F- F0 F8 2810 BEQ .1 YES, KEEP LOOPING
EE21- C9 2E 2820 CMP #'.' SUPPRESS TRAILING DECIMAL POINT
EE23- F0 01 2830 BEQ .2 ".", SO WRITE OVER IT
EE25- C8 2840 INY NOT ".", SO INCLUDE IN STRING AGAIN
EE26- A9 2B 2850 .2 LDA #'+' PREPARE FOR POSITIVE EXPONENT "E+XX"
EE28- A6 9A 2860 LDX EXPON SEE IF ANY E-VALUE
EE2A- F0 2E 2870 BEQ FOUT.5 NO, JUST MARK END OF STRING
EE2C- 10 08 2880 BPL .3 YES, AND IT IS POSITIVE
EE2E- A9 00 2890 LDA #0 YES, AND IT IS NEGATIVE
EE30- 38 2900 SEC COMPLEMENT THE VALUE
EE31- E5 9A 2910 SBC EXPON
EE33- AA 2920 TAX GET MAGNITUDE IN X
EE34- A9 2D 2930 LDA #'-' E SIGN
EE36- 99 01 01 2940 .3 STA STACK+1,Y STORE SIGN IN STRING
EE39- A9 45 2950 LDA #'E' STORE "E" IN STRING BEFORE SIGN
EE3B- 99 00 01 2960 STA STACK,Y
EE3E- 8A 2970 TXA EXPONENT MAGNITUDE IN A-REG
EE3F- A2 2F 2980 LDX #'0'-1 SEED FOR EXPONENT DIGIT
EE41- 38 2990 SEC CONVERT TO DECIMAL
EE42- E8 3000 .4 INX COUNT THE SUBTRACTION
EE43- E9 0A 3010 SBC #10 TEN'S DIGIT
EE45- B0 FB 3020 BCS .4 MORE TENS TO SUBTRACT
EE47- 69 3A 3030 ADC #'0'+10 CONVERT REMAINDER TO ONE'S DIGIT
EE49- 99 03 01 3040 STA STACK+3,Y STORE ONE'S DIGIT
EE4C- 8A 3050 TXA
EE4D- 99 02 01 3060 STA STACK+2,Y STORE TEN'S DIGIT
EE50- A9 00 3070 LDA #0 MARK END OF STRING WITH $00
EE52- 99 04 01 3080 STA STACK+4,Y
EE55- F0 08 3090 BEQ FOUT.6 ...ALWAYS
EE57- 99 FF 00 3100 FOUT.4 STA STACK-1,Y STORE "0" IN ASCII
EE5A- A9 00 3110 FOUT.5 LDA #0 STORE $00 ON END OF STRING
EE5C- 99 00 01 3120 STA STACK,Y
EE5F- A9 00 3130 FOUT.6 LDA #STACK POINT Y,A AT BEGINNING OF STRING
EE61- A0 01 3140 LDY /STACK (STR$ STARTED STRING AT STACK-1, BUT
EE63- 60 3150 RTS STR$ DOESN'T USE Y,A ANYWAY.)
3160 *--------------------------------
EE64- 80 00 00
EE67- 00 00 3170 CON.HALF .HS 8000000000 FP CONSTANT 0.5
3180 *--------------------------------
3190 * POWERS OF 10 FROM 1E8 DOWN TO 1,
3200 * AS 32-BIT INTEGERS, WITH ALTERNATING SIGNS
3210 *--------------------------------
EE69- FA 0A 1F
EE6C- 00 3220 DECTBL .HS FA0A1F00 -100000000
EE6D- 00 98 96
EE70- 80 3230 .HS 00989680 10000000
EE71- FF F0 BD
EE74- C0 3240 .HS FFF0BDC0 -1000000
EE75- 00 01 86
EE78- A0 3250 .HS 000186A0 100000
EE79- FF FF D8
EE7C- F0 3260 .HS FFFFD8F0 -10000
EE7D- 00 00 03
EE80- E8 3270 .HS 000003E8 1000
EE81- FF FF FF
EE84- 9C 3280 .HS FFFFFF9C -100
EE85- 00 00 00
EE88- 0A 3290 .HS 0000000A 10
EE89- FF FF FF
EE8C- FF 3300 .HS FFFFFFFF -1
3310 DECTBL.END
3320 *--------------------------------
S.EC4A