* Zet working at 25 Mhz without any visible problems...
* Implemented a simple PIC and Timer to receive both IRQ0 and IRQ1
* Hard disk implementation:
* Compact Flash controller through sysace (thanks to Sébastien
* int13_harddisk() function with read/write support
* int 19h implemented for hard disk
* Fetch simplification for NOP instruction
* Simulation model for the multiplier