From 6ffe43a8ccee6f3e2d6fda5062901f16c54ddaad Mon Sep 17 00:00:00 2001
From: Julian Blake Kongslie
Date: Mon, 31 Oct 2022 19:26:35 -0700
Subject: Level-trigger on TTO_FLAG instead of edge-trigger.

---
 io/model.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

(limited to 'io')

diff --git a/io/model.cpp b/io/model.cpp
index 3bea59e..fcabbd2 100644
--- a/io/model.cpp
+++ b/io/model.cpp
@@ -29,7 +29,7 @@ bool iomodel::interact(std::array<std::uint_fast32_t, NUM_CTLREGS> &ctlregs) {
             interrupt = true;
     }
     if (ctlregs[TT_INT_ENABLE]) {
-        if ((ctlregs[TT_BITS] & (TTO_FLAG|TTO_FLAG_OLD)) == TTO_FLAG)
+        if (ctlregs[TT_BITS] & TTO_FLAG)
             interrupt = true;
     }
     ctlregs[INT_PENDING] = interrupt;
@@ -40,7 +40,6 @@ bool iomodel::interact(std::array<std::uint_fast32_t, NUM_CTLREGS> &ctlregs) {
         ctlregs[DATA_INSTRUCTION_FIELD_BUFFER] = 0;
         ctlregs[HALTED] = 0;
         ctlregs[INT_ENABLE] = 0;
-        ctlregs[TT_BITS] |= (ctlregs[TT_BITS] & TTO_FLAG) ? TTO_FLAG_OLD : 0;
     } else {
         ctlregs[INT_ENABLE] = (ctlregs[INT_ENABLE] >> 1) * 3;
     }
-- 
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