X-Git-Url: http://git.joshuawise.com/fpgaboy.git/blobdiff_plain/7c1b9e8ea3a9ec0d0c00009df9212a1829e072ec..45d9d1c679e9ccbac6cad76107a2977d6cb69ddc:/GBZ80Core.v

diff --git a/GBZ80Core.v b/GBZ80Core.v
index e1aa308..053df4a 100644
--- a/GBZ80Core.v
+++ b/GBZ80Core.v
@@ -79,6 +79,7 @@
 `define INSN_BIT		9'b101xxxxxx
 `define INSN_RES		9'b110xxxxxx
 `define INSN_SET		9'b111xxxxxx
+`define INSN_ADD_HL		9'b000xx1001
 
 `define INSN_cc_NZ		2'b00
 `define INSN_cc_Z		2'b01
@@ -152,7 +153,7 @@ module GBZ80Core(
 	inout [15:0] bus1address,	/* BUS_* is latched on STATE_FETCH. */
 	inout [7:0] bus1data,
 	inout bus1wr, bus1rd,
-	input irq, input [7:0] jaddr,
+	input irq, output reg irqack, input [7:0] jaddr,
 	output reg [1:0] state);
 
 //	reg [1:0] state;					/* State within this bus cycle (see STATE_*). */
@@ -282,6 +283,7 @@ module GBZ80Core(
 		cycle <= 0;
 		twobyte <= 0;
 		bootstrap_enb <= 1;
+		irqack <= 0;
 	end
 
 	always @(negedge clk)	/* Set things up at the negedge to prepare for the posedge. */
@@ -295,8 +297,11 @@ module GBZ80Core(
 				busaddress <= address;
 				buswr <= wr;
 				busrd <= rd;
-				if (wr)
+				if (wr) begin
 					buswdata <= wdata;
+					if (address == 16'hFF50)
+						bootstrap_enb <= 0;
+				end
 			end
 		end
 		`STATE_DECODE: begin	/* Make sure this only happens for one clock. */
@@ -338,8 +343,10 @@ module GBZ80Core(
 			state <= `STATE_EXECUTE;
 		end
 		`STATE_EXECUTE: begin
+		`ifdef isim
 			if (opcode[7:0] === 8'bxxxxxxxx)
 				$stop;
+		`endif
 			casex (opcode)
 			`define EXECUTE
 			`include "allinsns.v"