Read and write successful in block driver. but unable to mount the device using fdisk. # fdisk /dev/sdb   // sdb is my device name kernel crashes here always. Any solution???  

Byte mode implemented for multiple bytes with synchronization. Nibble mode implemented for multiple bytes with synchronization. but code is not optimized yet.

Hello sir, assignment 1 and 2 implemented for parallel port. LED are glowing as per the ASCII of character.

??how char can be signed / unsigned ??? how can we define a negative char …. and why we need negative char ?