=-+=-+=¢ LOANPLUS/Gary B. Tyler - ¢ 18 Feb 1985¢ LOANPLUS MORTGAGE AND LOAN ANALYSIS¢ Documentation- File is on this disk¢ Reprinted by OL' HACKERS AUG, N.Y.¢ ¢ (LOAD PROGRAM WITH BASIC!)¢¢ Numerous programs intended to¢ calculate mortgage or other loan¢ information have been written. Some¢ have appeared in the ATARI supported¢ computer magazines over the last¢ couple of years. As good as some of¢ them have been, there always seemed to¢ be shortcomings.¢¢ Typically, you would be required to¢ enter the loan amount, interest rate,¢ and the length of the loan. The¢ program would then calculate the¢ monthly payment as well as allow an¢ amortization schedule to be displayed¢ or printed.¢¢ It seemed to me, though, that there¢ might be occasions when either the¢ loan amount, the interest rate, or the¢ loan length might be what one would¢ want to calculate.¢¢ The following program is an attempt at¢ expanding the flexibility of the loan¢ concept. It will allow any of the¢ variables in the standard interest¢ formula to be calculated, and more.¢¢ A=P(i(1+i) (1+i)n-1¢¢ where A= periodic payment¢ P= principal or loan amount¢ i= interest rate per period¢ (program calculates yearly¢ interest rate)¢ n= number of periods¢ (program calculates number of¢ years)¢¢ In addition it will calculate a loan¢ balance at any point in time desired.¢ If an amortization schedule is needed¢ it will print one to either the screen¢ or printer. (printer control codes are¢ for the Gemini 10X; REM statements¢ are included in the program to help¢ those of you with other non-compatible¢ printers)¢¢ In order to allow the complete¢ flexibility desired, a full screen¢ display is used. This is similar in¢ some respects to the old APX program¢ "Home Loan Analysis. In fact, it was a¢ photograph in the APX catalog that¢ inspired the writing of this current¢ program, [LOAN PLUS] This display¢ gives the user complete knowledge of¢ which inputs are or can be used. It¢ also permits repeated changes of one¢ variable or another. Comparisons or¢ fine tuning can thus be easily made.¢ At any time a printout of the screen¢ contents can be obtained (see sample¢ below).¢¢ ------------LOAN ANALYSIS------------¢¢ Purchase Price ---:$ 95900¢ Down Payment ---:$ 20000¢ Balloon Payment ---:$ 15000¢ Loan Amount ---:$ * 60900¢ Interest %---: 13¢ Loan Length YRS---: 30¢ Loan Payment ---:$ * 674¢ Total Loan Cost ---:$ * 242523¢ Total Interest ---:$ * 181623¢ Loan Start YR---: 1983¢ MTH---: 1¢ Amortized YR---: 1990¢ MTH---: 1¢ Loan Balance ---:$ * 58973¢¢ -------------------------------------¢¢ The one screen of instructions which¢ appears at the beginning of the¢ program is probably only useful the¢ first time or two. However, the 20¢ second wait before the program¢ continues is primarily for¢ initialization, player setup, etc. I¢ felt this was better than looking at a¢ blank screen.¢¢ All instructions to use the program¢ are shown at the bottom of the input¢ screen. The horizontal blue cursor¢ (player) can be moved up or down with¢ the OPTION or SELECT keys. Any item¢ which you want solved should be input¢ with an "*". 'Purchase Price', 'Total¢ Loan Cost', and 'Total Interest' will¢ automatically have an "*" input if¢ other proper values have already been¢ made. All inputs, including the "*",¢ are entered as data only after the¢ RETURN key has been pressed. When you¢ want a calculation, push the START¢ key. If you want to cancel an earlier¢ input, position the cursor over the¢ input, Then press the space bar and¢ RETURN key. A previous input can be¢ changed by simply placing the cursor¢ and entering the new value. To clear¢ all numbers from the screen press "C"¢ when that instruction appears at the¢ bottom of the screen.¢¢ It is not necessary to enter inputs¢ for all lines as shown in the example.¢ Only those needed for a particular¢ calculation are required. for¢ instance, in it's simplest form, you¢ could enter 95900 for 'Purchase Price'¢ and an "*" for 'Loan Amount'. Press¢ START and the correct amount of 95900¢ will appear in the calculation column¢ for 'loan Amount'.¢¢ Input length is limited to 7 character¢ or maximum. Entering¢ additional numbers will automatically¢ invoke a RETURN and the first 7¢ characters will become the valid¢ input. Since using a number this large¢ will result in some calculations of at¢ least 8 characters, that is the limit¢ in the calculation column.¢¢ When using the printer or printing an¢ amortization schedule to the screen,¢ additional prompts will appear at the¢ bottom of the screen. Make sure the¢ printer is initially at the 'top of¢ page'. Schedules will then page¢ properly and screen printouts will¢ allow 3 per page.¢¢ One strong concern was to have a¢ professionally looking printed or¢ display format. All inputs and¢ calculated values are converted to a¢ right justified format on the main¢ display screen. This is accomplished¢ using a string of INSERTS dependent on¢ the LENgth of each value. In addition,¢ all calculations for the amortization¢ schedules are decimal aligned, and¢ include trailing zeros.¢¢ Since the screen amortization schedule¢ only shows 12 months at a time, yearly¢ interest and principal totals are¢ shown as well as running totals to¢ that date. A hardcopy print of any¢ year can also be produced by following¢ the prompts.¢¢ Because all potential input lines are¢ shown on the screen at the same time,¢ I felt it was important to include¢ numerous error messages. These will¢ serve as a guide through the initial¢ uses of the program. (They also act as¢ a check for those who understand, but¢ are not currently thinking). These¢ error messages will appear at the¢ bottom of the screen and will¢ automatically return you to the 'input¢ mode' after an adequate amount of¢ chastizing.¢¢ SOME CAUTION:¢ If 'Loan Length' is to be calculated¢ it may result in a decimal which¢ cannot be equated to exact months. In¢ such cases it is best to massage the¢ variables to produce an even 'Loan¢ Length' before asking for an¢ amortization schedule.¢¢ When calculating the 'Interest Rate',¢ the program may require many¢ reiterations to zero-in on the correct¢ answer. Please be patient.¢¢ Pressing CTRL-1 will stop the program¢ and it will not accept any additional¢ input until it is pressed again. This¢ is not an enhancement to the program¢ but rather a hinderance I was unable¢ to eliminate.¢¢ Credit for the machine language player¢ movement routine must go to Tom Sak¢ and Sid Meier. Their article "P/M¢ Graphics Made Easy" appeared in¢ COMPUTE'S FIRST BOOK OF ATARI¢ GRAPHICS. It uses the vertical blank¢ interrupt to determine player moves.¢ This is accomplished by simply POKEing¢ the new coordinates rather than a USR¢ call.¢¢ This program will run under both ATARI¢ Basic or BASIC XL. Under the latter,¢ invoking the FAST command will speed¢ things up. It has not been thoroughly¢ tested on the 1200/600/800XL.¢¢ Considerable time has been spent¢ resolving the numerous 'bugs' which¢ have cropped up (more then had been¢ imagined). Hopefully, all have been¢ eliminated, though not likely. If any¢ are found, I would appreciate hearing¢ about them. Any questions will gladly¢ be answered. They can be addressed to¢ Gary B. Tyler,¢ 1525 NW 116th Ave.,¢ Portland, Oregon 97229.¢ ** END **¢
