1 files changed, 2 insertions, 2 deletions
diff --git a/lc3.c b/lc3.c
index 9740b19..aea29b7 100644
--- a/lc3.c
+++ b/lc3.c
@@ -169,7 +169,7 @@ uint16_t read_memory(const uint16_t address)
 	{
 		if (check_key())
 		{
-			memory[MEMORY_KBSR] = 1u << 15;
+			memory[MEMORY_KBSR] |= 1u << 15;
 			uint8_t c;
 			ssize_t r = read(0, &c, 1);
 			die(r, "read_memory read()");
@@ -177,7 +177,7 @@ uint16_t read_memory(const uint16_t address)
 		}
 		else
 		{
-			memory[MEMORY_KBSR] = 0;
+			memory[MEMORY_KBSR] &= ~(1u << 15);
 		}
 	}
 	else if (MEMORY_DSR == address)