As well as a bunch of logging, reinstated rotation position preservation across tracks.

Machines/Oric/Microdisc.cpp

@@ -11,6 +11,10 @@
 using namespace Oric;
 
 namespace {
+	// The number below, in cycles against an 8Mhz clock, was arrived at fairly unscientifically,
+	// by comparing the amount of time this emulator took to show a directory versus a video of
+	// a real Oric. It therefore assumes all other timing measurements were correct on the day
+	// of the test. More work to do, I think.
 	const int head_load_request_counter_target = 7653333;
 }
 
@@ -34,6 +38,16 @@ void Microdisc::set_disk(std::shared_ptr<Storage::Disk::Disk> disk, int drive)
 
 void Microdisc::set_control_register(uint8_t control)
 {
+	printf("control: %d%d%d%d%d%d%d%d\n",
+		(control >> 7)&1,
+		(control >> 6)&1,
+		(control >> 5)&1,
+		(control >> 4)&1,
+		(control >> 3)&1,
+		(control >> 2)&1,
+		(control >> 1)&1,
+		(control >> 0)&1);
+
 	// b2: data separator clock rate select (1 = double)	[TODO]
 
 	// b65: drive select
@@ -41,9 +55,10 @@ void Microdisc::set_control_register(uint8_t control)
 	set_drive(drives_[selected_drive_]);
 
 	// b4: side select
+	unsigned int head = (control & 0x10) ? 1 : 0;
 	for(int c = 0; c < 4; c++)
 	{
-		if(drives_[c]) drives_[c]->set_head((control & 0x10) ? 1 : 0);
+		if(drives_[c]) drives_[c]->set_head(head);
 	}
 
 	// b3: double density select (0 = double)