Ported the Yamaha V6355 from PCem.

src/include/86box/vid_v6355.h

@@ -0,0 +1,72 @@
+/*
+ * 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 old and new IBM CGA graphics cards.
+ *
+ * Authors: Sarah Walker, <https://pcem-emulator.co.uk/>
+ *          Miran Grca, <mgrca8@gmail.com>
+ *          Connor Hyde / starfrost, <mario64crashed@gmail.com>
+ *
+ *          Copyright 2008-2018 Sarah Walker.
+ *          Copyright 2016-2018 Miran Grca.
+ *          Copyright 2025      starfrost (refactoring).
+ */
+
+#ifndef VIDEO_V6355_H
+#define VIDEO_V6355_H
+
+typedef struct v6355_t {
+    mem_mapping_t mapping;
+
+    uint8_t       cgastat;
+    uint8_t       cgamode;
+    uint8_t       cgacol;
+
+    uint8_t       pad[3];
+    uint8_t       crtc[32];
+    uint8_t       v6355data[106];
+    uint8_t       charbuffer[256];
+
+    uint16_t      ma;
+    uint16_t      maback;
+
+    /* The V6355 has its own set of registers, as well as the emulated MC6845 */
+    int           v6355reg;
+    int           crtcreg;
+    int           fontbase;
+    int           linepos;
+    int           displine;
+    int           sc;
+    int           vc;
+    int           cgadispon;
+    int           con;
+    int           coff;
+    int           cursoron;
+    int           cgablink;
+    int           vsynctime;
+    int           vadj;
+    int           oddeven;
+    int           display_type;
+    int           firstline;
+    int           lastline;
+    int           drawcursor;
+    int           revision;
+    int           rgb_type;
+    int           double_type;
+
+    uint32_t      v6355pal[16];
+
+    uint64_t      dispontime;
+    uint64_t      dispofftime;
+
+    pc_timer_t    timer;
+
+    uint8_t *     vram;
+} v6355_t;
+
+#endif /*VIDEO_V6355_H*/

src/include/86box/video.h

@@ -401,11 +401,10 @@ extern const device_t gd5446_pci_device;
 extern const device_t gd5446_stb_pci_device;
 extern const device_t gd5480_pci_device;
 
-
-/* IBM CGA*/
+/* IBM CGA */
 extern const device_t cga_device;
 
-/* pravetz CGA */
+/* Pravetz CGA */
 extern const device_t cga_pravetz_device;
 
 /* Compaq CGA */
@@ -630,6 +629,9 @@ extern const device_t velocity_200_agp_device;
 /* Wyse 700 */
 extern const device_t wy700_device;
 
+/* Yamaha V6355 */
+extern const device_t v6355d_device;
+
 /* Tandy */
 extern const device_t tandy_1000_video_device; 
 extern const device_t tandy_1000hx_video_device;