- [FIX] Corrected key mapping

- [FIX] ULA ports reconnected after reset
- [FIX] port check on IN() was crashing.

z80.cpp

@@ -821,7 +821,7 @@ namespace z80
             port = (rA<<8) | port;
             // don't touch flags
         }
-        if (in_ports[port]) {
+        if (in_ports[port&0xff]) {
             const uint8_t val = (uint8_t)in_ports[port&0xff](port);
             if (val != 0xff)
                 return val;