closer to being able to run a cycle?

beneater/src/parts/ben_eater_pc.rs

@@ -24,6 +24,8 @@ impl BenEaterPC {
             // tick the clock.
             // tick the memory
             // tick the VIA
+        } else {
+            self.cpu.tick();
         }
     }
 }

beneater/src/parts/via6522.rs

@@ -1,5 +1,12 @@
+pub enum Via6522Port {
+    A(u8),
+    B(u8)
+}
+
 #[derive(Default)]
 pub struct Via6522 {
+    data_bus: u8,
+    address_bus: u16,
     port_a_state: u8,
     port_b_data: u8,
     port_a_direction: u8,
@@ -15,8 +22,15 @@ impl Via6522 {
         }
     }
 
-    pub fn set_a_direction(&mut self, new_direction: u8) {
-
+    pub fn set_port_direction(&mut self, port: Via6522Port) {
+        match port {
+            Via6522Port::A(x) => {
+                self.port_a_direction = x;
+            },
+            Via6522Port::B(x) => {
+                self.port_b_direction = x;
+            }
+        }
     }
 
     /// check for output pins and see what they say