The model is designed to work on a basic IBM (or compatible) PC with a small amount of memory and disk space and will work without a mouse or colour monitor. The operating requirements of the model are as follows:
Disk space:
260 KB for each model stored
Operating system:
Lotus 123 version 3.1+ with WYSIWYG function[1]
Memory:
610 KB[2]
Before loading the model, Lotus 123 must be loaded by either clicking on the
Lotus 123 icon (in windows) or by changing to the Lotus directory and
typing <123> followed by 
(in DOS).
The WYSIWYG screen display function must be loaded (if it does not load automatically) by typing <Alt F10> (ie. by typing the Alt key and F10 key together), then by selecting <load> from the menu. A selection of Lotus 123 programmes should appear and the program <WYSIWYG.PIC> should be found and selected.
The
Forest Industry Model will only appear as it is shown in these notes if the
display settings are correct. The WYSIWYG program should be set to display 29
lines per screen. This can be done by typing <:>[3]
(to get into the WYSIWYG menu), then by selecting <display>, <rows>,
<29> and . The default font should be set to Swiss
12pt by typing <:>, then by
selecting <format>, <font>, <replace>, <Swiss>,
<12> from the menu, followed
by .
In order to print results properly, it is also necessary to install and set the default printer within Lotus 123 to the printer being used. The instructions for doing this will vary between printers, so it might be necessary to refer to the printer manual to get the necessary information to do this. Both ITFMP models are designed to work with an HP Laserjet 3 printer, and the settings for this should be compatible with a wide selection of other printers.
To
load the Forest Industry Model, insert the disk supplied into the floppy disk
drive and select the model by typing </>
to get into the Lotus 123 menu, then by selecting <file>, <retrieve>
and by typing <a:\FORIND.WK3>
or <b:\FORIND.WK3> (depending
on whether the floppy disk drive is drive a or drive b), followed by . The disk contains a sample model which is
ready to use[4]
and should look something like Figure 1.
[1]. The model will run on other versions of Lotus-123 and compatible spreadsheet programmes such as Quattro and Excel. The calculations within the model should still work correctly but the display may not fit onto the screen correctly.
[2]. If Lotus-123 is started from within Windows, the amount of memory available to Lotus may not be enough to run the model, in which case the computer should be restarted in DOS mode. Memory problems may also occur in DOS depending on the allocation of memory and the number of other programmes in memory, in which case the computer manual should be consulted to see if the amount of memory available can be increased.
[3]. Sometimes a different key is required to get into the WYSIWYG menu.
[4]. There may be other settings within Lotus 123 which have to be changed to reduce memory use (eg. by switching the undo function off) or improve the display, but the most important settings have been described here and the model should work if these settings are applied.
