Video changes of the day (November 13th, 2024)

1. Finally add the ATI 8514/A Ultra add-on BIOS in both ISA and MCA variants (despite the ROM page failure on POST).
2. Fixed a mode switch bug in the Mach8 (both add-on and vga combo) when exiting the Win3.x GUI using the native drivers.
3. Corrected (best possible) the eeprom load of the Mach8 products.
4. Partial implementation of the FIFO on the 8514/A compatible products including Mach8/32 and plain IBM 8514/A.

src/include/86box/vid_8514a.h

@@ -42,6 +42,9 @@ typedef union {
 typedef struct ibm8514_t {
     rom_t bios_rom;
     rom_t bios_rom2;
+    mem_mapping_t bios_mapping;
+    uint8_t *rom1;
+    uint8_t *rom2;
     hwcursor8514_t hwcursor;
     hwcursor8514_t hwcursor_latch;
     uint8_t        pos_regs[8];
@@ -212,6 +215,8 @@ typedef struct ibm8514_t {
     uint8_t subsys_cntl;
     uint8_t subsys_stat;
 
+    atomic_int fifo_idx;
+    atomic_int ext_fifo_idx;
     atomic_int force_busy;
     atomic_int force_busy2;
 
@@ -223,11 +228,10 @@ typedef struct ibm8514_t {
     int      ext_crt_pitch;
     int      extensions;
     int      linear;
-    int      _4bpp;
     uint32_t vram_amount;
     int      vram_512k_8514;
-    PALETTE  _8514pal;
     int      vendor_mode;
+    PALETTE  _8514pal;
 
     latch8514_t latch;
 } ibm8514_t;