Amstrad changes :

- Add PPC512/640 emulation
- Add TV display type to Sinclair PC200
- Add font selection to PC1512
- Add disc change line to PC200
Patch from JohnElliott

src/vid_mda.h

@@ -1 +1,38 @@
+
+typedef struct mda_t
+{
+        mem_mapping_t mapping;
+        
+        uint8_t crtc[32];
+        int crtcreg;
+        
+        uint8_t ctrl, stat;
+        
+        int dispontime, dispofftime;
+        int vidtime;
+        
+        int firstline, lastline;
+
+        int linepos, displine;
+        int vc, sc;
+        uint16_t ma, maback;
+        int con, coff, cursoron;
+        int dispon, blink;
+        int vsynctime, vadj;
+
+        uint8_t *vram;
+} mda_t;
+
+void mda_init(mda_t *mda);
+void mda_out(uint16_t addr, uint8_t val, void *p);
+uint8_t mda_in(uint16_t addr, void *p);
+void mda_write(uint32_t addr, uint8_t val, void *p);
+uint8_t mda_read(uint32_t addr, void *p);
+void mda_recalctimings(mda_t *mda);
+void mda_poll(void *p);
+
+/* Override mapping of attribute to colour */
+void mda_setcol(int chr, int blink, int fg, uint8_t cga_ink);
+
 extern device_t mda_device;
+