Massive IDE clean-ups, and finally implemented ATAPI hard disks.

src/chipset/intel_piix.c

@@ -1600,7 +1600,10 @@ piix_init(const device_t *info)
 
     dev->port_92 = device_add(&port_92_pci_device);
 
-    cpu_set_isa_pci_div(4);
+    if (cpu_busspeed > 50000000)
+        cpu_set_isa_pci_div(4);
+    else
+        cpu_set_isa_pci_div(3);
 
     dma_alias_set();
 

src/chipset/via_vt82c49x.c

@@ -30,6 +30,7 @@
 #include <86box/mem.h>
 #include <86box/smram.h>
 #include <86box/pic.h>
+#include <86box/timer.h>
 #include <86box/hdc.h>
 #include <86box/hdc_ide.h>
 #include <86box/port_92.h>