Changes
/* DSK: TODO : arnoldemu testbench */
Perhaps dsk does go into sleep after a certain time of no use, and then takes a certain time to wake up when reused : a timeout for turning the motor off. Perhaps overrun of FDC does turn the motor off.
http://cpctech.cpc-live.com/docs/upd765a/necfdc.htm
During disk data transfers between the FDC and the processor, via the data bus, the FDC must be serviced by the processor every 27µs in the FM mode, and every 13µs in the MFM mode, or the FDC sets the OR (Over Run) flag in Status Register 1 to a 1 (high), and terminates the Read Data Command.
arnoldemu's second testbench
