From 1f41f702e2d942ea28bba3ed984dd026b8d87585 Mon Sep 17 00:00:00 2001
From: Nicholas Orlowsky <nickorlow@nickorlow.com>
Date: Mon, 8 Apr 2024 01:31:04 -0500
Subject: [PATCH] fix of

---
 cpu.sv | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/cpu.sv b/cpu.sv
index 31989f2..859dff4 100644
--- a/cpu.sv
+++ b/cpu.sv
@@ -17,6 +17,7 @@ module cpu (
   logic [7:0] alu_result;
   logic alu_overflow;
   logic alu_done;
+  logic compute_of;
 
   alu alu (
       alu_rst,
@@ -193,6 +194,7 @@ module cpu (
                     instr.alu_i.op <= structs::ADD;
                     instr.alu_i.operand_a <= opcode[7:0];
                     instr.alu_i.operand_b <= registers[opcode[11:8]];
+                    compute_of <= 0;
 
                     state <= ST_EXEC;
                 end
@@ -312,7 +314,7 @@ module cpu (
                     if (alu_done) begin
                         instr.src <= BYTE;
                         instr.src_byte <= alu_result;
-                        registers[15] <= alu_overflow;
+                        registers[15] <= compute_of ? alu_overflow : registers[15];
                         state <= ST_WB;
                         program_counter <= program_counter + 2;
                     end