Initial emulation of the IBM 8514/A coprocessor for both the MCA and ISA buses.

Currently the GUI option is on the QT frontend.

src/include/86box/86box.h

@@ -111,7 +111,8 @@ extern int	sound_is_float,			/* (C) sound uses FP values */
 		GAMEBLASTER,			/* (C) sound option */
 		GUS, GUSMAX,			/* (C) sound option */
 		SSI2001,			/* (C) sound option */
-		voodoo_enabled;			/* (C) video option */
+		voodoo_enabled,			/* (C) video option */
+		ibm8514_enabled;        /* (C) video option */
 extern uint32_t	mem_size;			/* (C) memory size (Installed on system board) */
 extern uint32_t	isa_mem_size;		/* (C) memory size (ISA Memory Cards) */
 extern int	cpu,				/* (C) cpu type */

src/include/86box/vid_8514a.h

@@ -0,0 +1,109 @@
+/*
+ * 86Box	A hypervisor and IBM PC system emulator that specializes in
+ *		running old operating systems and software designed for IBM
+ *		PC systems and compatibles from 1981 through fairly recent
+ *		system designs based on the PCI bus.
+ *
+ *		This file is part of the 86Box distribution.
+ *
+ *		Emulation of the 8514/A card from IBM for the MCA bus and
+ *      generic ISA bus clones without vendor extensions.
+ *
+ *
+ *
+ * Authors:	TheCollector1995
+ *
+ *		Copyright 2022 TheCollector1995.
+ */
+
+#ifndef VIDEO_8514A_H
+# define VIDEO_8514A_H
+
+typedef struct ibm8514_t
+{
+    uint8_t pos_regs[8];
+
+    int force_old_addr;
+    int type;
+
+    uint32_t vram_size;
+    uint32_t vram_mask;
+
+    PALETTE vgapal;
+    uint8_t dac_mask, dac_status;
+    uint32_t *map8;
+    int dac_addr, dac_pos, dac_r, dac_g;
+
+    struct {
+        uint16_t subsys_cntl;
+        uint16_t setup_md;
+        uint8_t advfunc_cntl, ext_advfunc_cntl;
+        uint16_t cur_y, cur_y_bitres;
+        uint16_t cur_x, cur_x_bitres;
+         int16_t desty_axstp;
+         int16_t destx_distp;
+         int16_t err_term;
+         int16_t maj_axis_pcnt;
+        uint16_t cmd, cmd_back;
+        uint16_t short_stroke;
+        uint16_t bkgd_color;
+        uint16_t frgd_color;
+        uint16_t wrt_mask;
+        uint16_t rd_mask;
+        uint16_t color_cmp;
+        uint16_t bkgd_mix;
+        uint16_t frgd_mix;
+        uint16_t multifunc_cntl;
+        uint16_t multifunc[16];
+        uint8_t pix_trans[2];
+        int poly_draw;
+        int ssv_state;
+        int x1, x2, y1, y2;
+        int sys_cnt, sys_cnt2;
+        int temp_cnt;
+        int cx, cy;
+        int sx, sy;
+        int dx, dy;
+        uint32_t src, dest;
+        uint32_t newsrc_blt, newdest_blt;
+        uint32_t newdest_in, newdest_out;
+        uint8_t *writemono, *nibbleset;
+        int x_count, y_count;
+        int input, output;
+
+        uint16_t cur_x_bit12, cur_y_bit12;
+        int ssv_len;
+        uint8_t ssv_dir;
+        uint8_t ssv_draw;
+        int odd_in, odd_out;
+
+        uint16_t scratch;
+    } accel;
+
+    uint16_t test;
+
+    int v_total, dispend, v_syncstart, split,
+	h_disp,  h_disp_old, h_total,  h_disp_time, rowoffset,
+	dispon, hdisp_on, linecountff,
+	vc, linepos, oddeven, cursoron, blink, scrollcache,
+	firstline, lastline, firstline_draw, lastline_draw,
+	displine, fullchange, x_add, y_add;
+	uint32_t ma, maback;
+
+    uint8_t *vram, *changedvram, linedbl;
+
+    uint8_t data_available, data_available2;
+    uint8_t scanmodulos, rowcount;
+    int htotal, hdisp, vtadj, vdadj, vsadj, sc,
+        vtb, vdb, vsb, vsyncstart, vsyncwidth;
+    int vtotal, vdisp;
+    int disp_cntl, interlace;
+    uint8_t subsys_cntl, subsys_stat;
+
+    volatile int force_busy, force_busy2;
+
+    int blitter_busy;
+    uint64_t blitter_time;
+    uint64_t status_time;
+} ibm8514_t;
+#endif	/*VIDEO_8514A_H*/

src/include/86box/vid_svga.h

@@ -17,6 +17,9 @@
  *		Copyright 2016-2020 Miran Grca.
  */
 
+#include <86box/thread.h>
+#include <86box/vid_8514a.h>
+
 #ifndef VIDEO_SVGA_H
 # define VIDEO_SVGA_H
 
@@ -45,6 +48,7 @@ typedef union {
 
 typedef struct svga_t
 {
+    ibm8514_t dev8514;
     mem_mapping_t mapping;
 
     uint8_t fast, chain4, chain2_write, chain2_read,
@@ -161,12 +165,18 @@ typedef struct svga_t
 
 	int force_old_addr;
 
+    int vga_on;
+
 	int remap_required;
 	uint32_t (*remap_func)(struct svga_t *svga, uint32_t in_addr);
 
     void *ramdac, *clock_gen;
 } svga_t;
 
+extern svga_t *svga_8514;
+
+extern void ibm8514_poll(ibm8514_t *dev, svga_t *svga);
+extern void ibm8514_recalctimings(svga_t *svga);
 
 extern int	svga_init(const device_t *info, svga_t *svga, void *p, int memsize,
 			  void (*recalctimings_ex)(struct svga_t *svga),

src/include/86box/video.h

@@ -200,6 +200,9 @@ extern void	agpgart_set_gart(void *handle, uint32_t base);
 
 
 #ifdef EMU_DEVICE_H
+/* IBM 8514/A and generic clones*/
+extern void ibm8514_device_add(void);
+
 /* ATi Mach64 */
 extern const device_t mach64gx_isa_device;
 extern const device_t mach64gx_vlb_device;