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The program, written for a 1 6K ZX81, would be fairly easy to convert to run on other systems. It is meant for small businesses with up to 100 customers. It will print out their names and address, tell you who hasn't paid their bills, and other things you'll discover. It's pretty easy to use the program, because all the prompts are self-explanatory. There's one point to watch, and this concerns the entering of a customer's name and address. The format for this is: "Customer's name* 1st line of the address* 2nd line of the address* . . and so on. . last line of the address NEWLINE". Entering * (shift B| after each line of the name and address ensures that it is correctly formatted when dumping on the printer. The second point to be careful of in entering the program is that in certain lines a double asterisk
4090 GOTO 9100 5000 GOSUB 9500 5010 IF F = 1 THEN RETURN 5020 LET A${G) = *' [80 x Z ]" 5030 GOSUB9100 5040 LET C = C- 1 5050 RETURN 6000 LET H = 0 6010 FOR D = 1 TOC 6020 IF AID) >0 THEN GOSUB 9700 6030 IF A{D)>0 THEN LPRINT, A(D),,,, 6040 NEXT D 6050 RETURN 7000 GOSUB 9500 7010 IF F = 1 THEN RETURN 7020 LET H = 0 7030 LET D = G 7040 GOTO 9700 8000 PRINT "SET TAPE TO RECORD AND PLAY" 8010 PRINT "THEN PRESS NEWLINE" 8020 INPUT B$ 8030 SAVE "CUSTOMER" 8040 GOTO 240 9000 PRINT "HAVE YOU SAVED THE PROGRAM ON" 9010 PRINT "TAPE?" 9020 INPUT B$ 9030 IF B$(1) = "N" THEN RETURN 9040 NEW 9099 REM BUBBLESORT 9100 LET J = 0 9110 FOR D = 1 TOC-1 9120 IF A$(DXA$(D+ 1) THEN GOTO 9200 9130 LET K$ = A$(DI 9140 LET K = AID) 9150 LET A$(D) = A$(D+1) 9160 LET A$(D|=*A(D+1> 9170 LET A$(D+ 1) = K$ 9180 LET AID + 11 = K 9190 LET J = 1 9200 NEXT D 9210 IF J = 0 THEN RETURN 9220 GOTO 9100 9499 REM NAME OR NUMBER 9500 LET F = 0 9510 PRINT "NAME OR NUMBER (1 or 2)?" 9520 INPUTJ 9530 IF J = 2 THEN GOTO 9630 9540 PRINT "WHAT NAME?" 9550 INPUT B$ 9560 FOR K = 1 TO C 9570 IF A$(K) (TO LEN(B$)| = B$ THEN GOTO 9660 9580 NEXT K 9590 PRINT "NAME NOT FOUND" 9600 LET F = 1 9610 PAUSE 100 9620 RETURN 9630 PRINT "WHAT NUMBER?" 9640 INPUT G 9650 RETURN 9660 LET G = K 9670 RETURN 9699 REM PRINT A CUSTOMER 9700 LET X = 0 9710 IF H = 1 THEN LPRINT D; 9720 LPRINT TABI5); 9730 LET X = X + 1 9740 IF A${D,X) = THEN GOTO 9780 9750 IF A${D,X) = THEN GOTO 9810 9760 LPRINT A$(D,X); 9770 GOTO 9730 9780 LPRINT 9790 LPRINT TABI5); 9800 GOTO 9730 9810 LPRINT 9820 LPRINT 9830 LPRINT 9840 RETURN Business Software review we take a look at one of the leaders in the ZX81 business software field — Hilderbay Ltd. Hilderbay produce a number of splendid software packs for the ZX81, including STOCK CONTROL and PAYROLL, and their follow-up service and documentation is an object lesson in how professional software should be presented. Hilderbay produce a number of splendid software packs for the ZX81, including STOCK CON- TROL and PAYROLL, and their follow-up service and documentation is an object lesson in how professional software should be presented. All programs come complete with an extensive instruction booklet. Hilderbay also offer a backup service, and will replace programs made obsolete by legislation changes. We'll look at their range program by program: Financial Pack 1: This pack has three programs, LOAN, which — for a loan repayable in equal instalments — computes one of the following in terms of the Other three, principal, number of payments, instalment and interest; VAT, which works out, and displays neat tables and running totals, as you enter information from a mixture of bills with and without VAT at different rate; and MORT- GAGE, which can be used to get answers to such questions as "How much longer will your mortgage take to repay if you pay £25 less per month?" and "How much of your latest payment went towards interest?" Budget: This program keeps track of expenses for up to 50 headings over a year. For each heading, a budget can be entered at any time. A second version of the program is available, which handles the information in a different manner. Both versions have a facility to trigger the printer for a permanent record. Both versions can be used for private or business purposes. VAT is not included explicitly, but can be handled if required as one or more separate headings. Critical Path Analysis: This program allows the user to apply the critical path analysis technique to any projects which consist of a well-defined set of activities which may be started and stopped independently of one another and must in some cases be performed in a certain order. Michael Levy, head of the American firm Mindware, which is concentrating on providing business applications software for the ZX81 in the US, said that the CPA program from Hilderbay was one of the best he had seen for any system — and he added that he'd seen a large number running on a wide variety of machines, from IBM mainframes down to pocket computers. This program for the ZX81 will deal with problems including up to 500 activities in 16K. If you buy one of the larger memory units available, you can easily deal with many thousands of activities. Payroll: This program which, like all the others, is supported by clear and useful documentation and comes with a followup service, allows employers to keep and update pay records for up to 30 employees. The basis can be weekly, monthly, or any other time interval you choose. Mike Salem, head of Hilderbay, has rightly concluded that many people who use the ZX81 in their businesses may have no knowledge of, and little interest in, computers as such, but still want to be able to use the programs without trouble. This program was designed to cater for these people. You can, if you like, write the results by hand on the usual cards, rather than using the printer. As well, you can always revert to doing it all by hand if you like You won't become dependent on the computer. The program is designed to be saved after each use, thus saving the current variables on tape, then run next time with the command GOTO 1, rather than RUN. The current program being sold by Hilderbay is, so to speak, obsolete, because of tax and other changes, but those having earlier versions wilt be supplied with up to date versions. This fact shows the at- ZX COMPUTING SUMMER 1982 87
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j Summer Britain's Biggest Magazine
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ZX 80/81 HARDWARE/SOFTWARE ZX KEYBO
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ZX Computing is published quarterly
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16K-byte RAM pock for massive add-o
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The @*?$1!&£@ RAM pack Dear ZX Com
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I u < o •0 8 & £T © Benchmarks
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1 1© L" 20 30 IN5 5 0 60 80 9C 100
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Page 105 and 106: Software Orwin strikes again Casset
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Page 131 and 132: ZX Users' Club JOIN YOUR USERS' GRO
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