- [NEW] zxscreen

- [NEW] F8 para execució
- [NEW] F5 continua execució
- [NEW] ULA synch interrupt
- [NEW] Break on read/write
- [FIX] INC8 and DEC8 did wrong flags calculations
- [FIX] INCMEM8 and DECMEM8 did no flags calculation at all
- [NEW] Flags visualization
- [DEL] run command replaced by cont command
- [NEW] reset command
- [NEW] Breakpoint delete command

z80.cpp

@@ -1,4 +1,5 @@
 #include "z80.h"
+#include "z80debug.h"
 
 #include <stdio.h>
 
@@ -131,6 +132,7 @@ namespace z80
 
     uint8_t READ_MEM_8(const uint16_t addr)
     {
+        if (z80debug::isbreak(addr, 2)) z80debug::stop();
         t+=3;
         return memory[addr];
     }
@@ -155,13 +157,14 @@ namespace z80
 
     uint16_t READ_MEM_16(const uint16_t addr)
     {
-        return READ_MEM_8(addr) + READ_MEM_8(addr+1) << 8;
+        return READ_MEM_8(addr) + (READ_MEM_8(addr+1) << 8);
     }
 
     const uint8_t WRITE_MEM_8(const uint16_t addr, const uint8_t value)
     {
         t+=3;
-        memory[addr] = value;
+        if (addr>=0x4000) memory[addr] = value;
+        if (z80debug::isbreak(addr, 4)) z80debug::stop();
         return value;
     }
 
@@ -263,9 +266,9 @@ namespace z80
         uint8_t value = *reg + 1;
 
         KEEP_FLAGS(fC);
-        FLAGS_SZXY(*reg);
-        if (*reg == 0x80) SET_FLAGS(fV);
-        if ( (*reg & 0x0f) == 0x00 ) SET_FLAGS(fH);
+        FLAGS_SZXY(value);
+        if (value == 0x80) SET_FLAGS(fV);
+        if ( (value & 0x0f) == 0x00 ) SET_FLAGS(fH);
 
         *reg = value;
     }
@@ -275,10 +278,10 @@ namespace z80
         uint8_t value = *reg - 1;
 
         KEEP_FLAGS(fC);
-        FLAGS_SZXY(*reg);
+        FLAGS_SZXY(value);
         SET_FLAGS(fN);
-        if (*reg == 0x7f) SET_FLAGS(fV);
-        if ( (*reg & 0x0f) == 0x0f ) SET_FLAGS(fH);
+        if (value == 0x7f) SET_FLAGS(fV);
+        if ( (value & 0x0f) == 0x0f ) SET_FLAGS(fH);
 
         *reg = value;
     }
@@ -288,6 +291,12 @@ namespace z80
         t++;
         uint8_t value = READ_MEM_8(addr);
         value++;
+
+        KEEP_FLAGS(fC);
+        FLAGS_SZXY(value);
+        if (value == 0x80) SET_FLAGS(fV);
+        if ( (value & 0x0f) == 0x00 ) SET_FLAGS(fH);
+
         WRITE_MEM_8(addr, value);
     }
 
@@ -296,6 +305,13 @@ namespace z80
         t+=1;
         uint8_t value = READ_MEM_8(addr);
         value--;
+
+        KEEP_FLAGS(fC);
+        FLAGS_SZXY(value);
+        SET_FLAGS(fN);
+        if (value == 0x7f) SET_FLAGS(fV);
+        if ( (value & 0x0f) == 0x0f ) SET_FLAGS(fH);
+
         WRITE_MEM_8(addr, value);
     }
 
@@ -566,6 +582,13 @@ namespace z80
         RETN();
     }
 
+    void interrupt()
+    {
+        if (!iff1) return;
+        PUSH(rPC);
+        rPC = 0x38;
+    }
+
     void RST(uint8_t vec)
     {
         PUSH(rPC);