comparison emu/mem.c @ 30:c0c2e99b6bb0

fixed negative rel8 address bug in assembler

         if (on == 0x00) {
             flags = CBIT(flags, flag);
         }
         else {
             flags = SBIT(flags, flag);
+        }
+    }
+}
+
+/* sets zero and parity flags based on content of byte */
+void
+set_zp(BYTE val){
+    if (val == 0) {
+        set_flag(Z, 1);
+        set_flag(P, 0);
+    }
+    else {
+        /* think of this as folding */
+        val ^= val >> 4;
+        val ^= val >> 2;
+        val ^= val >> 1;
+        val &= 1;
+        if (val == 0) {
+            set_flag(P, 1);
+        }
+        else {
+            set_flag(P, 0);
         }
     }
 }
 
 WIDE

     return val;
 }
 
 WIDE
 fetch_wide(void) {
-    WIDE val = MWIDE(mem[get_wide(PC)], mem[get_wide(PC) + g1]);
+    WIDE val = MWIDE(mem[get_wide(PC)], mem[get_wide(PC) + 1]);
     inc_pc(2);
     return val;
 }
 
 /* 0b000 = R0