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/printer/prt_cpmap.c

@@ -572,18 +572,22 @@ static const struct {
 
 
 /* Select a ASCII->Unicode mapping by CP number */
-const uint16_t *
-select_codepage(uint16_t code)
+const void
+select_codepage(uint16_t code, uint16_t *curmap)
 {
-    int i;
+    int i = 0;
+    const uint16_t *map_to_use;
 
-    for (i = 0; maps[i].code != -1; i++)
-	if (maps[i].code == code) return(maps[i].map);
+    map_to_use = maps[0].map;
 
-    if (code == 0)
-	return(maps[0].map);
-
-    //ERRLOG("CPMAP: unsupported code page %i, using CP437...\n", code);
-
-    return(maps[0].map);
+    while (maps[i].code != 0) {
+	if (maps[i].code == code) {
+		map_to_use = maps[i].map;
+		break;
+	}
+	i++;
+    }
+    
+    for (i = 0; i < 256; i++)
+	curmap[i] = map_to_use[i];
 }