TachoSoft 23.1 Mileage Calculator

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Useful tips:

1. In case if mileage is written down in eeprom, and on the PCB there

   are more than one of the same type it is necessary to search for

   that which is more close to the display or the microprocessor.

                                                                     

2. Some chips have protection against reading, please use

   programmers which are able to bypass this protection. 

3. After you have read dump from a memory chip please look on

   its content. If there are only zero's or FF's  it means   

   the dumps is wrong readed.                            

                                                         

4. After reading the chip ALWAYS make a backup dump file.

                                                         

5. Try to write recalibrated dump into new chip, so you will always

   have original chip for backup.                                  

                                                                   

6. Before changing the mileage, count on the calculator original mileage

   and compare it to that which it is written down in original dump.

                                                                    

7. Calculated and readed mileages can differ in following cases:

                                                                

                                                                   

   7.1 Probably, it is necessary to change senior and younger bytes

       (to make SWAP)  Example: ABCD -> CDAB                      

                                                                  

   7.2 As the rule, mileage calculation methods are trade secret's

       of dash manufacturers, so the algorithms presented here are

       formulas calculated personally by us, and sometimes they   

       have accuracy of + - 250km (miles). It is not essential    

       in calibration, but you must consider this fact when comparing

       original and calculated mileage values.                       

                                                                    

   7.3 Dash manufacturer can sometimes change offset's where mileage

       is stored in the memory chip, so in case of discrepancies

       please look all dump entirely.