>>>> 3

In order to change a save game file, you need to know how the numbers are stored in the files.

Hexadecimal, which is abbreviated as hex when used in computer terms,
is a different counting base.

Usually us humans use base -10. This is that from 1 to 10 there is
10 numbers eg.

1 2 3 4 5 6 7 8 9 10

But hexadecimal is base - 16. To count to 10 you go through 16 numbers
eg.

1 2 3 4 5 6 7 8 9 a b c d e f 10

As computers use Binary, which is base - 2, eg.

1 10

this is very messy to look at, it would be converted to hexadecimal
to make it easier to program in machine code.

DOS only uses one byte per character, one byte equalling 8 binary spaces
or 0000 0000. So the highest number you can show in binary is 1111 1111
which equals FF in hexadecimal.

This is only effective up to the number 255 which is what the above
binary and hexadecimal numbers equal.

Games store numbers in hexadecimal format instead of character format
the idea being that a number like 255 stored as hexadecimal uses less disk
space than as characters.

For example, 255 stored as hexadecimal would be:

FF

which equals a single character

But if you stored 255 as characters it would take up 3 bytes:

.. 32 35 35 .. .. 2 5 5

(hex characters)

**Note:** If you are already computer competent, then you may wonder
why I am referring to FF as meaning 255, while when RAM is concerned 256
is used instead; this is because mathematically FF does equal 255, but
in computer terms, if you include 00 as equalling one unit, then FF would
make a total of 256 separate units.

You can't have more than double digits with a hex number, so what if
you need a number higher than 255? (or FF in hex)

Well there is a tricky formula used to store higher numbers in hex,
here is a rough diagram

showing it: