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/rom.c

@@ -13,7 +13,7 @@
  *		- c386sx16 BIOS fails checksum
  *		- the loadfont() calls should be done elsewhere
  *
- * Version:	@(#)rom.c	1.0.42	2018/11/02
+ * Version:	@(#)rom.c	1.0.43	2019/01/13
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -519,6 +519,13 @@ rom_load_bios(int rom_id)
 		biosmask = 0x3fff;		
 		return(1);
 
+	case ROM_ZD_SUPERS:  /* [8088] Zenith Data Systems SupersPort */
+		if (!rom_load_linear(
+			L"roms/machines/zdsupers/z184m v3.1d.10d",
+			0x000000, 32768, 0, rom)) break;
+		biosmask = 0x7fff;
+		return(1);		
+		
 	case ROM_CMDPC30:
 		if (! rom_load_interleaved(
 			L"roms/machines/cmdpc30/commodore pc 30 iii even.bin",