From 8190adce177a2622550eba65427eb5ce246c4e11 Mon Sep 17 00:00:00 2001
From: Aqua-sama <aqua@iserlohn-fortress.net>
Date: Fri, 12 Feb 2021 19:14:56 +0200
Subject: CGA: blank last line when scrolling up

---
 drivers/cga.cc | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/drivers/cga.cc b/drivers/cga.cc
index 79facee..961d7e4 100644
--- a/drivers/cga.cc
+++ b/drivers/cga.cc
@@ -100,6 +100,11 @@ void CGA::write(char c) {
         buffer[prev] = buffer[idx];
       }
     }
+
+    // blank out last row
+    for (size_t idx = (max_rows - 1) * max_columns; idx < max_rows * max_columns; ++idx) {
+      buffer[idx].c = ' ';
+    }
     --row;
   }
 }
-- 
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