You can not work with Motronic maps without understanding hexadecimal numbers. I hope the following helps.
Motronic digital fuel injection systems use 8-bit processors (8-bit data bus). Each 8-bit word contains an executable instruction or a piece of numerical data. 8-bit data is stored in hexadecimal (hex) format. Hexadecimal is a base-16 system and differs from the decimal system which is base-10.
hexadecimal, or simply hex, is a base-16 numbering system using the symbols 0–9 and A–F. It's purpose is to represent binary code in a user friendly format. One hexadecimal digit stands in place of four binary bits. Letters A–F represent numbers 10-15 as a single digit. The largest decimal number that can be represented in a 8-bit system is 255 (or FF hex).
Hex examples:
The decimal number 255 in binary is 11111111 and in hex is FF (F = 1111, F =
1111).
The decimal number 31 in binary is 00011111 and in hex is 1F (1
= 0001, F = 1111).
The decimal number 161 in binary is 10100001 and in hex is A1 (A = 1010,1 =
0001).
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Hexadecimal Numbering System - letters are used to represent numbers 10 to15 |
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Decimal |
base 10 |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
255 |
|
Hexadecimal |
base 16 |
0 |
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
A |
B |
C |
D |
E |
F |
10 |
FF |
One of the best tools for hex to decimal conversion is already on your computer at C:\WINDOWS\CALC.EXE Hex conversion at the push of a button. Under the View menu, select scientific.
All numbers on the web pages herein are decimal numbers unless followed by a lower case letter "h" to indicate hexadecimal. Example, hex FF will be written as FFh, hex 00 will be written as 00h, etc.
