Initial commit

sim/ports.js

@@ -0,0 +1,44 @@
+port_p0 = 0;
+port_p1 = 1;
+port_p2 = 2;
+port_p3 = 3;
+message = "";
+
+// This function is called when time (t-states) advances.
+API.tick = () => {
+}
+
+// This function is called when an 'out' is executed in Z80.
+API.writePort = (port, value) => {
+    // Go through all ports
+    if (port == 0x9000) {
+        if (value != 0) {
+            message += String.fromCharCode(value);
+         } else {
+            API.log("> " + message);
+            message = "";
+         }
+    } else if (port == 0x82) {
+        port_p0 = value;
+    } else if (port == 0xA2) {
+        port_p1 = value;
+    } else if (port == 0xC2) {
+        port_p2 = value;
+    } else if (port == 0xE2) {
+        port_p3 = value;
+    }
+}
+
+
+API.readPort = (port) => {
+    if (port == 0x82) {
+        return port_p0;
+    } else if (port == 0xA2) {
+        return port_p1;
+    } else if (port == 0xC2) {
+        return port_p2;
+    } else if (port == 0xE2) {
+        return port_p3;
+    }
+}
+