[floppy] fixed error in nic sector offset value in a FAT cluster It was hardcoded to work with 4 fat sectors per cluster. Generalized for any sectors per cluster value.

debug: added some commands to debug sd card communication

debug: temporary disabled disk ii interface

[sdcard] Fixed typo in initialization procedure After acmd 41, must wait for empty R1 (0x00), not IDLE (0x01).

[encoder] use in-hardware quadrature encoder system instead of software

[sdcard] faster SPI /4 prescaler instead of /64

[schematics] Missing track, fixed

[repo] Updated readme with changes in schematics (rev1.1)

[schematics] rev1.1 label

[schematics] updated routing fixing errata of rev1.0