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MortCalc.doc
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1990-10-22
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MortCalc.doc
~~~~~~~~~~~~
MortCalc is freeware. Enjoy and pass it around with all
the included files.
OPERATION
~~~~~~~~~
-from the CLI: MortCalc <-c -f -s>
where -c change the default calculation mode from USA to Canada
-f change the default language from English to French
-s displays raw data (6 decimals, not rounded) to the
standard output (CLI). Can be redirected to the printer
with the command line: MortCalc >PRT: -s.
"MortCalc ?" displays a help screen on the CLI.
-from the Workbench: just double click on the icon. See PRESELECTION.
BUTTONS AND BOXES
~~~~~~~~~~~~~~~~~
If you are fluent with Amigese, run MortCalc right away and read
this doc later for the fine points.
Select the operation you want to do by clicking in one of the
buttons at the left (PRINCIPAL, RATE, PERIOD, BALANCE or PAYMENT).
The amortization PERIOD is the length of the loan. The selected
button stays highlighted and the STATUS line confirms your selection.
At startup, MortCalc will compute the monthly payments for the figures
displayed in the value boxes (PAYMENT selected).
To change a value, select a box by clicking in it and edit the digits
with the keyboard or the keypad (DEL, Backspace and the left and right
cursor keys work the usual way). You may click CALCULATE anytime. If
you hit <RETURN> instead, the cursor jumps to the next box.
To clear a box, you may use the Right Amiga-X combination (press X
while holding down the right fancy A key). Clearing a box just makes
room to enter a new value; to really change a value, you have to click
CALCULATE. This button enters all the displayed figures and the result
is highlighted by the cursor in the selected value box.
Clicking on the CALCULATE button updates the display and formats the
output with $, %, etc. The value boxes accept any character but will
read in only digits and decimal points. Naturally, any non-numerical
entry will generate an error message.
When the RATE is computed, an error message will be displayed if
total INTEREST equals or exceeds total payments.
The INTEREST box shows the cumulative interest amount paid. This is
the only box that doesn't accept a direct input; this value is updated
each time a new payment is calculated.
The CANADA button changes the default mode from USA (monthly
compounded) to Canada (semiannually compounded). With the startup
values, PAYMENT is $132.15 (USA) and $131.04 (Canada). MortCalc values
have been verified with annuity tables and are very reliable.
You can enter any multiple of 12 (1, 2, 3, 4, 6 or 12) in the
"Compounded over ... months" box. For instance, enter 3 to get
"quarterly compounded".
The PRINT button gets you a hard copy of all the values.
CAUTION: MortCalc may hang if this option is selected while the
printer is not on-line.
To QUIT, hit the Close button in the upper left corner of the
MortCalc window.
SHORT CUTS
~~~~~~~~~~
All the value boxes (exept PERIOD) accept digits only, so you don't
need to enter any comma, $ or % ; CALCULATE does that for you.
As for the PERIOD box, it uses any non-digit character(s) to separate 2
integer fields (years and months). So, the following entries are
equivalent:
10 yrs 2 mo.
10 ans 2 mois
10/2
0y122 (122 months is 10 years and 2 months)
Please note that the PERIOD box accepts integers only. All the other
boxes take both integer and decimal values.
You may operate MortCalc without the mouse if you use the arrow keys
within a box and the <RETURN> key to move from box to box. Place the
mouse pointer on CALCULATE and simultaneously press left Alt-left Amiga
to simulate a mouse click...
ROAD TEST
~~~~~~~~~
MortCalc can do a lot of things besides calculating your monthly
instalments. For instance, using the startup values, you may want to
know how long it would take to pay the principal if the payments
were set at $150. To find out, select the PERIOD box, then edit
the PAYMENT value box to $150.00 and click CALCULATE.
You may wish to know the balance on a loan after, say, one year.
Just select BALANCE, and enter 1 in the PERIOD box.
Watch out for asymptotic values, else you may have to pay your
mortgage for the whole eternity. For instance, click PERIOD and try
to increment the PRINCIPAL until you get an error message (which
will show up when the PERIOD exceeds 9999 months). You will find out
that at some point just before the error message, a difference of
one miserable dollar in the principal adds *years* of payments.
If you add fractions of cent (say $0.003) to the PAYMENT, you may
notice an increment of a few dollars in PRINCIPAL. The rounding down
of figures also explains why you may have in few cents left in BALANCE
when the amortization PERIOD is over. Use the CLI -s option (raw data)
if you need a precision of more than two decimals.
MortCalc gives you all the figures you need to shop for a mortgage.
You no longer have to take for granted everything your loan agent
tells you, and you may even teach him a trick or two.
PRESELECTION OF DEFAULT VALUES
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
You may change some startup values by editing the Tool Types
box of the icon (Workbench ICON menu item). ARG1=CAN and ARG2=FR
will change the defaults options to Canada and French, respectively.
Delete these entries to get the default values (USA and English).
Invisible language selection is a welcome feature in a small world
like ours.
AGITPROP
~~~~~~~~
The next version of MortCalc will incorporate weekly and biweekly
(each other week) compounding if enough users ask for it.
Michel LalibertΘ