Video features and fixes:

Added the Mach8 and Mach32 ISA/VLB/PCI cards (initial implementation and MCA coming soon for the Mach32) and their corresponding EEPROM's.
Added INMOS XGA ISA card and updated the SVGA core to reflect its mapping as well as the Mach8/32 mapping when in 8514 monitor mode.
Mark the XGA button as already checked and locked when a standalone XGA BIOS card is present like the INMOS one. (QT only)
Same concept as above, but applies to the Mach8 and 32 for the 8514 option as well. (QT only)

src/include/86box/vid_8514a.h

@@ -24,6 +24,8 @@ typedef struct ibm8514_t {
 
     int force_old_addr;
     int type;
+    int local;
+    int bpp;
 
     uint32_t vram_size;
     uint32_t vram_mask;
@@ -32,6 +34,7 @@ typedef struct ibm8514_t {
     uint8_t   dac_mask, dac_status;
     uint32_t *map8;
     int       dac_addr, dac_pos, dac_r, dac_g;
+    int       internal_pitch;
 
     struct {
         uint16_t subsys_cntl;
@@ -58,7 +61,7 @@ typedef struct ibm8514_t {
         uint8_t  pix_trans[2];
         int      poly_draw;
         int      ssv_state;
-        int      x1, x2, y1, y2;
+        int16_t  x1, x2, x3, y1, y2;
         int      sys_cnt, sys_cnt2;
         int      temp_cnt;
         int16_t  cx, cy, oldcy;
@@ -80,6 +83,7 @@ typedef struct ibm8514_t {
 
         uint16_t scratch;
         int      fill_state, xdir, ydir;
+        uint32_t ge_offset;
     } accel;
 
     uint16_t test;
@@ -90,7 +94,7 @@ typedef struct ibm8514_t {
         dispon, hdisp_on, linecountff,
         vc, linepos, oddeven, cursoron, blink, scrollcache,
         firstline, lastline, firstline_draw, lastline_draw,
-        displine, fullchange, x_add, y_add;
+        displine, fullchange;
     uint32_t ma, maback;
 
     uint8_t *vram, *changedvram, linedbl;
@@ -103,11 +107,13 @@ typedef struct ibm8514_t {
     int     disp_cntl, interlace;
     uint8_t subsys_cntl, subsys_stat;
 
-    volatile int force_busy, force_busy2;
+    atomic_int force_busy, force_busy2;
 
     int      blitter_busy;
     uint64_t blitter_time;
     uint64_t status_time;
     int pitch;
+    int ext_pitch;
+    int ext_crt_pitch;
 } ibm8514_t;
 #endif /*VIDEO_8514A_H*/