Rewritten 808x CPU emulation core based on reenigne's XTCE, VisiOn, SnatchIt, and 8088 MPH now work correctly;

Fixed PC speaker sound volume in PIT mode 0;
A few CPU emulation clean-ups;
Hard disk controller changing redone in a less messy way;
Re-added the long-missing key send delay handling to the XT keyboard handler;
Fixed a bug that was causing SLiRP not to work when compiled with MingW/GCC 7.3.0-2 or newer;
Some serial mouse and port fixes;
A lot of changes to printer emulation, mostly based on DOSBox-X;
Printer PNG writer now uses statically linked libpng;
Added support for the HxC MFM floppy image format and upped 86F format version to 2.12;
Ported various things from PCem and some from VARCem;
Added the S3 86c801/805 emulation (patch from TheCollector1995);
Fixed and renamed the EGA monitor options;
Better synchronized the 808x to the PIT and the CGA;
Fixed the CGA wait state calculation;
Cleaned up some things in mem.c;
Fixed some things in the floppy emulation to make VisiOn get the correct errors from the copy protection disk;
Fixed several renderer-related bugs, including the SDL2 renderer's failure to take screenshots;
The Jenkins builds are now compiled with MingW/GCC 7.4.0-1 and include all the required DLL's.

src/pc.c

@@ -8,7 +8,7 @@
  *
  *		Main emulator module where most things are controlled.
  *
- * Version:	@(#)pc.c	1.0.89	2018/11/05
+ * Version:	@(#)pc.c	1.0.91	2018/11/14
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -256,7 +256,9 @@ fatal(const char *fmt, ...)
     config_save();
 
     dumppic();
+#ifdef ENABLE_808X_LOG
     dumpregs(1);
+#endif
 
     /* Make sure the message does not have a trailing newline. */
     if ((sp = strchr(temp, '\n')) != NULL) *sp = '\0';
@@ -658,7 +660,7 @@ again2:
 
     sound_init();
 
-    hdc_init(hdc_name);
+    hdc_init();
 
     return(1);
 }
@@ -758,6 +760,9 @@ pc_reset_hard_init(void)
     /* Initialize the actual machine and its basic modules. */
     machine_init();
 
+    /* Reset and reconfigure the serial ports. */
+    serial_standalone_init();
+
     /* Reset and reconfigure the Sound Card layer. */
     sound_card_reset();
 
@@ -895,7 +900,9 @@ pc_close(thread_t *ptr)
 
     if (dump_on_exit)
 	dumppic();
+#ifdef ENABLE_808X_LOG
     dumpregs(0);
+#endif
 
     video_close();