Reverted Direct3D to 2048x2048 buffer and suppressed the EGA/(S)VGA overscan, if enabled, in 2048x modes, fixes Direct3D freezes;

Improved the BusLogic incoming mailbox code;
The BusLogic callback is now three-phases and outgoing mailbox interrupts are emulated correctly;
Fixed the CD-ROM command READ DISC INFORMATION (0x51), fixes NetBSD crashing 86Box with segmentation fault when using the AHA-154x;
Added the CD-ROM command PAUSE/RESUME ALT (0xC2).

src/pc.c

@@ -393,10 +393,14 @@ void resetpc_cad()
 	pc_keyboard_send(211);	/* Delete key released */
 }
 
+int suppress_overscan = 0;
+
 void resetpchard()
 {
 	int i = 0;
 
+	suppress_overscan = 0;
+
 	savenvr();
 	saveconfig();