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/cpu/x86.h

@@ -1,23 +1,28 @@
-uint16_t oldcs;
-extern uint32_t rmdat32;
-int oldcpl;
+extern uint8_t	opcode, opcode2;
+extern uint8_t	flags_p;
+extern uint8_t	znptable8[256];
 
-extern int nmi_enable;
+extern uint16_t	zero, oldcs;
+extern uint16_t	lastcs, lastpc;
+extern uint16_t rds, ea_rseg;
+extern uint16_t	znptable16[65536];
+extern uint16_t *mod1add[2][8];
 
-int tempc;
-int output;
-int firstrepcycle;
+extern int	x86_was_reset, codegen_flat_ds;
+extern int	codegen_flat_ss, nmi_enable;
+extern int	timetolive, keyboardtimer, trap;
+extern int	tempc, optype, use32, stack32;
+extern int	oldcpl, cgate32, cpl_override, fpucount;
+extern int	gpf, nmi_enable;
+extern int	oddeven, inttype;
 
-uint32_t easeg,ealimit,ealimitw;
+extern uint32_t rmdat32, easeg;
+extern uint32_t	oxpc, flags_zn;
+extern uint32_t abrt_error;
+extern uint32_t	backupregs[16];
+extern uint32_t *mod1seg[8];
+extern uint32_t *eal_r, *eal_w;
 
-int skipnextprint;
-int inhlt;
-
-uint8_t opcode;
-int noint;
-
-uint16_t lastcs,lastpc;
-extern int timetolive,keyboardtimer;
 
 #define setznp168 setznp16
 
@@ -30,47 +35,25 @@ extern int timetolive,keyboardtimer;
 #define setr16(r,v) cpu_state.regs[r].w=v
 #define setr32(r,v) cpu_state.regs[r].l=v
 
-uint8_t znptable8[256];
-uint16_t znptable16[65536];
+#define fetchea()	{					\
+				rmdat = readmemb(cs + pc);	\
+				pc++;				\
+				reg = (rmdat >> 3) & 7;		\
+				mod = (rmdat >> 6) & 3;		\
+				rm = rmdat & 7;			\
+				if (mod!=3)			\
+					fetcheal();		\
+			}
 
-int use32;
-int stack32;
-
-#define fetchea()   { rmdat=readmemb(cs+pc); pc++;  \
-                    reg=(rmdat>>3)&7;               \
-                    mod=(rmdat>>6)&3;               \
-                    rm=rmdat&7;                   \
-                    if (mod!=3) fetcheal(); }
-
-
-int optype;
 #define JMP 1
 #define CALL 2
 #define IRET 3
 #define OPTYPE_INT 4
 
-uint32_t oxpc;
-
-extern uint16_t *mod1add[2][8];
-extern uint32_t *mod1seg[8];
-
-
-#define IRQTEST ((flags&I_FLAG) && (pic.pend&~pic.mask) && !noint)
-
-extern int cgate32;
-
-
-extern uint32_t *eal_r, *eal_w;
-
-
-extern uint32_t flags_zn;
-extern uint8_t flags_p;
 #define FLAG_N (flags_zn>>31)
 #define FLAG_Z (flags_zn)
 #define FLAG_P (znptable8[flags_p]&P_FLAG)
 
-extern int gpf;
-
 
 enum
 {
@@ -83,25 +66,8 @@ enum
         ABRT_PF  = 0xE
 };
 
-extern uint32_t abrt_error;
 
-void x86_doabrt(int x86_abrt);
-
-extern uint8_t opcode2;
-
-extern uint16_t rds;
-extern uint32_t rmdat32;
-
-extern int inscounts[256];
-
-void x86illegal();
-
-void x86seg_reset();
-void x86gpf(char *s, uint16_t error);
-
-extern uint16_t zero;
-
-extern int x86_was_reset;
-
-extern int codegen_flat_ds;
-extern int codegen_flat_ss;
+extern void	x86_doabrt(int x86_abrt);
+extern void	x86illegal();
+extern void	x86seg_reset();
+extern void	x86gpf(char *s, uint16_t error);