connect interrupt pin

rtl/apple1.v

@@ -39,6 +39,9 @@ module apple1(
     // I/O interface to keyboard
     input ps2_clk,              // PS/2 keyboard serial clock input
     input ps2_din,              // PS/2 keyboard serial data input
+	 
+	 // interrupt signa
+	 input INT_n,
 
     // Outputs to VGA display
     output vga_h_sync,          // hozizontal VGA sync pulse
@@ -76,7 +79,7 @@ module apple1(
         .dbi    (cpu_din),
         .dbo    (cpu_dout),
         .we     (we),
-        .irq_n  (1'b1),
+        .irq_n  (INT_n),
         .nmi_n  (1'b1),
         .ready  (cpu_clken)        
     );

rtl/apple1_mist.sv

@@ -6,8 +6,7 @@
 
 // TODO use a CPU that allows illegal instructions
 // TODO ram refresh lost CPU cycles
-// TODO power on-off key ? (init ram)
-// TODO implement power off/on with F9
+// TODO power on-off key ? init ram with values
 // TODO ram powerup initial values
 // TODO reorganize file structure
 // TODO ACI: wav tools
@@ -332,9 +331,13 @@ apple1 apple1
 	.ram_dout (bus_dout),
 	.ram_rd   (cpu_rd),
 	.ram_wr   (cpu_wr),
-		
+
+	// ps2 keyboard	
 	.ps2_clk(ps2_kbd_clk),
 	.ps2_din(ps2_kbd_data),
+	
+	// interrupt signal
+	.INT_n(VDP_INT_n),
 
 	.vga_h_sync(hs),
    .vga_v_sync(vs),
@@ -595,7 +598,7 @@ vram vram
 );
 
 wire [7:0] vdp_dout;
-wire VDP_INT_n;         // TODO not connected yet
+wire VDP_INT_n;         
 
 // divide by two the vdp_clock (which is doubled for the scandoubler)
 reg vdp_ena;