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/sound/midi_fluidsynth.c

@@ -225,7 +225,7 @@ void* fluidsynth_init(const device_t *info)
 
 	/* Try loading the DLL. */
 #ifdef _WIN32
-	fluidsynth_handle = dynld_module("libfluidsynth-1.dll", fluidsynth_imports);
+	fluidsynth_handle = dynld_module("libfluidsynth.dll", fluidsynth_imports);
 #else
 	fluidsynth_handle = dynld_module("libfluidsynth.so", fluidsynth_imports);
 #endif

src/sound/snd_lpt_dac.c

@@ -111,7 +111,9 @@ const lpt_device_t lpt_dac_device =
         dac_close,
         dac_write_data,
         dac_write_ctrl,
-        dac_read_status
+	NULL,
+        dac_read_status,
+	NULL
 };
 const lpt_device_t lpt_dac_stereo_device =
 {
@@ -120,5 +122,7 @@ const lpt_device_t lpt_dac_stereo_device =
         dac_close,
         dac_write_data,
         dac_write_ctrl,
-        dac_read_status
+	NULL,
+        dac_read_status,
+	NULL
 };

src/sound/snd_lpt_dss.c

@@ -116,5 +116,7 @@ const lpt_device_t dss_device =
         dss_close,
         dss_write_data,
         dss_write_ctrl,
-        dss_read_status
+	NULL,
+        dss_read_status,
+	NULL
 };

src/sound/snd_speaker.c

@@ -8,61 +8,62 @@
 #include "snd_speaker.h"
 
 
-int speaker_mute = 0;
-int speaker_gated = 0;
+int speaker_mute = 0, speaker_gated = 0;
 int speaker_enable = 0, was_speaker_enable = 0;
 
-
 int gated,speakval,speakon;
 
 
-static int16_t speaker_buffer[SOUNDBUFLEN];
+static int32_t speaker_buffer[SOUNDBUFLEN];
 static int speaker_pos = 0;
 
 
-void speaker_update(void)
+void
+speaker_update(void)
 {
-        int16_t val;
-        
-        for (; speaker_pos < sound_pos_global; speaker_pos++)
-        {
-                if (speaker_gated && was_speaker_enable)
-                {
-                        if (!pit.m[2] || pit.m[2]==4)
-                                val = speakval;
-                        else if (pit.l[2] < 0x40)
-                                val = 0xa00;
-                        else 
-                                val = speakon ? 0x1400 : 0;
-                }
-                else
-                        val = was_speaker_enable ? 0x1400 : 0;
+    int32_t val;
 
-                if (!speaker_enable)
-                        was_speaker_enable = 0;
+    if (speaker_pos >= sound_pos_global)
+	return;
 
-                speaker_buffer[speaker_pos] = val;
-        }
-}
+    for (; speaker_pos < sound_pos_global; speaker_pos++) {
+	if (speaker_gated && was_speaker_enable) {
+		if (!pit.m[2] || pit.m[2]==4)
+			val = speakval;
+		else if (pit.l[2] < 0x40)
+			val = 0xa00;
+		else
+			val = speakon ? 0x1400 : 0;
+	} else
+		val = was_speaker_enable ? 0x1400 : 0;
 
-static void speaker_get_buffer(int32_t *buffer, int len, void *p)
-{
-        int c;
+	if (!speaker_enable)
+		was_speaker_enable = 0;
 
-        speaker_update();
-        
-        if (!speaker_mute)
-        {
-                for (c = 0; c < len * 2; c++)
-                        buffer[c] += speaker_buffer[c >> 1];
-        }
-
-        speaker_pos = 0;
+	speaker_buffer[speaker_pos] = val;
+    }
 }
 
 
-void speaker_init(void)
+static void
+speaker_get_buffer(int32_t *buffer, int len, void *p)
 {
-        sound_add_handler(speaker_get_buffer, NULL);
-        speaker_mute = 0;
+    int c;
+
+    speaker_update();
+
+    if (!speaker_mute) {
+	for (c = 0; c < len * 2; c++)
+		buffer[c] += speaker_buffer[c >> 1];
+    }
+
+    speaker_pos = 0;
+}
+
+
+void
+speaker_init(void)
+{
+    sound_add_handler(speaker_get_buffer, NULL);
+    speaker_mute = 0;
 }

src/sound/sound.c

@@ -8,7 +8,7 @@
  *
  *		Sound emulation core.
  *
- * Version:	@(#)sound.c	1.0.25	2018/10/28
+ * Version:	@(#)sound.c	1.0.26	2019/01/13
  *
  * Authors:	Sarah Walker, <http://pcem-emulator.co.uk/>
  *		Miran Grca, <mgrca8@gmail.com>
@@ -439,6 +439,10 @@ sound_card_reset(void)
 	mpu401_device_add();
     if (GUS)
 	device_add(&gus_device);
+#if defined(DEV_BRANCH) && defined(USE_GUSMAX)
+    if (GUSMAX)
+	device_add(&gusmax_device);
+#endif
     if (GAMEBLASTER)
 	device_add(&cms_device);
     if (SSI2001)