From 20bf425f983328ab1d8250de86969ffdb8587eb9 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Sat, 2 Nov 2019 23:37:56 -0400
Subject: [PATCH] Drive select lines are active low.

---
 Machines/AtariST/AtariST.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Machines/AtariST/AtariST.cpp b/Machines/AtariST/AtariST.cpp
index 1e9f0a9ab..7997100ba 100644
--- a/Machines/AtariST/AtariST.cpp
+++ b/Machines/AtariST/AtariST.cpp
@@ -512,7 +512,7 @@ class ConcreteMachine:
 						b1: select floppy drive 0
 						b0: "page choice signal for double-sided floppy drive"
 				*/
-				dma_->set_floppy_drive_selection(value & 2, value & 4, value & 1);
+				dma_->set_floppy_drive_selection(!(value & 2), !(value & 4), value & 1);
 			}
 		}