We are doing a project were we are making a cardreader. When we store the card information into an external RAM everything seems ok. But when we try to retreive the information some of the characters are wrongly read. Its the same characters every time. Here are some examples:
Stored:4925363210474371
Retreived:4622662213413311

Stored:21170713196778=0
Retreived:2713773318608800

This error does not occur when we emulate the 8751controller with a mice 8052.

What could be the problem?