From 74a32b7a37c1c4a9a293839a5b79981ff3532a58 Mon Sep 17 00:00:00 2001
From: Erick <ahmederick00@gmail.com>
Date: Sat, 5 Feb 2022 00:49:27 +0100
Subject: [PATCH] add memory mapped registers for keyboard status and data

---
 tyvm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/tyvm.c b/tyvm.c
index 50ba59c..9e64935 100644
--- a/tyvm.c
+++ b/tyvm.c
@@ -30,6 +30,12 @@
 #define FALSE 0
 
 
+/* memory mapped register tables */
+enum mmr {
+    MMR_KSR = 0xFE00,   // keyboard status
+    MMR_KDR = 0xFE02    // keyboard data
+}
+
 /* Initializing 10 registers of which:
 8 general purpose, 1 program counter, 1 conditional */
 enum registers {