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216 ADC HL.HL 217 EX DE.HL 218 EXX 219 ADC HL,HL 220 JR C.650A,SAVE If a bit drops into the carry, go and retrieve it for the quotient. 221 SBC HL.DE Trial subtract the divisor. 222 JRNC.650D, NRST Go, if no carry, to no restore. 223 ADD HL.DE Add back the divisor if there was carry. 224 AND A Clear the carry and go with no bit 225 JR 650E.C0NT for the quotient. 226 SAVE AND A Force no restore and one for the 227 SBC HLDE quotient here. 228 NRST SCF Set the carry flag: one for the quotient. 229 CONT DJNZ 64F6.DIVL Lop back for each bit of dividend (32 times!. 230 EXX 231 ADC HL,HI- Move last bit into quotient. 232 EX DE.HL 233 ADC HL.HL 234 EX DE.HL 235 EXX 236 LD A,H Now test the remainder. 237 0RL 238 JR Z.6527,FACT Go if it is zero. 239 AND A Clear the carry. 240 LD HL,
795 5'00 •BIG S20 33© 1O0) 540 ) TOO 960 REM SEE PRIMES NO-ONE HAS EUER SEEN EEFORE 970 REM SFTUE MODIFIED PROGRRM 960 REM GOOD LUCK 990 REM THE <strong>ZX</strong>S1 HOLDS 2**32-5 RND 2**31-1 iNftCCURftTELY 10000REM IT HOLDS 2**32-2-3 RND (2**32-2) 2 ft C C- U R FTT E L" V HEX CODE c, . _ FOR SPRF IN LINES 2 TO D9 S2 67 ED 53 SO 67 D9 11 03 00 CD E7 64 1 1 05 00 CD E7 64 11 ©7 ©0 CD E7 64 11 OB ©0 CD E 7 64 13 13 CD E7 6 4 13 13 1 -I -U W 13 CD 57 64 13 13 CD IN 57 64 13 13 13 13 CD E7 64 21 06 00 19 EE CD E 7 64 13 13 CD E7 64 21 ©6 3 00 19 EE CD E7 64 13 13 13 13 CD E7 64 13 13 CD 57 64 13 13 13 13 CD E7 0 64 21 ©6 00 19 EE CD E7 64 2 1 06 0© 19 EB CD E7 64 13 13 CD E 7 64 21 06 00 19 EE CD E7 64 13 13 E 13 13 CD E7 6 4 13 13 CD E7 64 21 06 ©0 19 EB CD E7 64 13 13 13 13 CD E7 64 21 06 ©0 19 EB CD E 7 64 21 06 00 13 EB CD E7 : - 64 13 13 13 13 CD E7 64 • • * H • 13 13 CD E7 64 13 13 13 > 13 CD E7 64 13 13 CD E7 64 13 13 13 13 CD E7 64 r E 21 08 00 19 EE CD E7 64 21 06 00 19 EB CD E7 64 13 13 13 13 CD E7 64 21 • 06 00 19 EB CD E7 64 13 5.S 13 CD E7 64 13 13 13 13 5 CD E"? 64 21 ©6 ©© 19 EB CD A E7 64 -L--I 13 CD E7 64 21 06 00 19 EB CD E7 64 3 21 06 00 19 EB CD E7 64 1 13 X W 13 13 CD E7 64 13 ? 13 CD E7 64 13 13 13 13 CD E7 64 21 ©6 ©© 19 EE i"l CD E7 64 13 13 CD E7 64 21 ©6 00 19 EB CD E7 64 13 13 13 13 CD E7 64 13 13 CD E7 64 13 13 13 13 CD E7 64 13 13 CD E7 64 21 ©ft ©0 19 EB CD E7 64 13 13 CD E7 64 21 ©ft 00 19 EB CD E7 64 C3 ft© 63 D9 2ft 90 67 ED SB 92 67 D9 21 0© ©0 ©6 2© ft7 D9 ED 6ft EB ED 6ft EB D9 ED 6ft 36 06 ED 3© ©7 19 R7 16 04 ft7 ED 52 37 10 E6 D9 ED 6ft EB ED 6ft EB D9 ?C B5 26 ©B R7 2ft 94 67 ED 52 DO 3E ©1 IS ©5 RF ED 53 8E 67 32 96 67 D9 2R 32 67 ED 5B S© 67 D9 E 1 C9 0© ©0 ©O ©Q ©0 ©0 ©0 ©0 0© ©0 ©© ©© 00 0© 00 0© ©© O© ©Q ©© ©0 00 0© 00 O© ©0 ©© ©0 ©0 ©O ©0 ©0 0© ©© ©© ©0 00 00 00 00 ©0 ©© 0© 0© 00 00 ©© 00 0© 0© ©O 0© 00 00 O© 0© ©© i t * > • « • i i • • • • • • • • • • • • • i t ' . _ _ J • I <strong>ZX</strong> COMPUTING AUG/SEPT 1982 31
Page 1 and 2: QsMTPQMK]® Britain's Biggest FOR T
Page 3 and 4: Fully cased keyboard £37.95 Uncase
Page 5 and 6: ZX Computing is published bi-monthl
Page 7 and 8: So as a business machine it really
Page 9 and 10: r « te i? ell ce • No-one asked
Page 11 and 12: "...the quality of the colour displ
Page 13 and 14: as ! Cassette £6: Fun to Learn ser
Page 15 and 16: to n The following week, at a ZX Mi
Page 17 and 18: ZX COMPUTING AUGUST/SEPT 1982 17
Page 19 and 20: an )ms 2 at ing out TO, if wn md th
Page 21 and 22: 2 9000 901© I" C'LS PRINT 9020 PRI
Page 23 and 24: two ; rom and The J as sive >!ied ;
Page 25 and 26: word Games The spectral Hangman rid
Page 27 and 28: " 260 PRINT CHR5 FL (133 ;CHR$ CHR$
Page 29: 32 The second program, MPRF, is a g
Page 33 and 34: The printout shows you what the scr
Page 35 and 36: OHMRND" 90 PRINT RT 1 3 , 2 ; " N ,
Page 37 and 38: 18 PRINT "NUMBER OP WORDS TO E £ S
Page 39 and 40: 'LIT N y RRT >' • m / L- >y R . u
Page 41 and 42: shown in the manual, then typing in
Page 43 and 44: Graphics The PLOT thickens The IF..
Page 45 and 46: Construction c 1 1 1 1 32 Bit 7 Bit
Page 47 and 48: ions cuit only :on- The eys y to at
Page 49 and 50: !28240 • Lines 390 to 480 single
Page 51 and 52: 1 There's no special reason for our
Page 53 and 54: [ Sample printouts from J. K Graye
Page 55 and 56: I V i If you've ever struggled with
Page 57 and 58: 5 PRINT "SEEK" 10 DIM P(2) 20 DIM Z
Page 59 and 60: Machine Code Figure 1. 01 1A00 LD B
Page 61 and 62: Book reviews Caring for your comput
Page 63 and 64: is a characteristic of earlier Time
Page 65 and 66: Sorting it out This utility program
Page 67 and 68: Colourthello is intended to highlig
Page 69 and 70: 0 Level Physics Paul Holmes from Su
Page 71 and 72: DO you use A CASserre DCCH WITH YOU
Page 73 and 74: 60 PRINT BT 2,3; M i i W M T T T f
Page 75 and 76: ZX81 Spectrum 16K 1 MANAGEMENT GAME
Page 77 and 78: Some BASlCs do not allow a computed
Page 79 and 80: t an ling idile it /erto the EN >nt
Page 81 and 82:
AS and B$. A$ holds information con
Page 83 and 84:
220 LET B1=P 225 LET Lfl=i 230 LET
Page 85 and 86:
Vegas Breaker Chuck Hopper's progra
Page 87 and 88:
y y Personal Software is a new quar
Page 89 and 90:
ZX80 Carries 150 LET D = 0 350 IF B
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Graphics User-definable graphics Th
Page 93 and 94:
frame counter as a timer use this r
Page 95 and 96:
Specialist Book$ Choosing program*
Page 97 and 98:
The Spectrum Listing 5 REM * MRTCHS
Page 99 and 100:
Make sure you get every issue of ZX
Page 101 and 102:
Business Keeping tabs on your chequ
Page 103 and 104:
JRS SOFTWARE 19 WAYSIDE AVENUE. WOR
Page 105 and 106:
11SO GOTO 1030 1150 LET X$ = X $ (
Page 107 and 108:
The variables used are as follows;
Page 109 and 110:
MELBOURNE HOUSE • ZX81 • SPECTR
Page 111 and 112:
L£T B=B+1; BEEP .2,B*2S -4.0 LET G
Page 113 and 114:
5 REM Pro g r am three 10 LET a$=CH
Page 115 and 116:
2° Cassette E3: Fun to Learn serie
Page 117 and 118:
ZX80 Dimensions Width 174mm (6.85 i
Page 119 and 120:
Mathematical Operations And Functio
Page 121 and 122:
FULLER FD SYSTEM £39*95 Profession
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