From b62f3e726a9e970fa88bba20f0f0f6d7f3613007 Mon Sep 17 00:00:00 2001
From: Thomas Harte <thomas.harte@gmail.com>
Date: Tue, 12 Sep 2017 20:43:53 -0400
Subject: [PATCH] Adds a start-of-execution-phase get-out for drives that
 aren't ready.

---
 Components/8272/i8272.cpp | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/Components/8272/i8272.cpp b/Components/8272/i8272.cpp
index 39a7e9035..62ffab6c9 100644
--- a/Components/8272/i8272.cpp
+++ b/Components/8272/i8272.cpp
@@ -335,6 +335,10 @@ void i8272::posit_event(int event_type) {
 				if(!dma_mode_) SetNonDMAExecution();
 				SET_DRIVE_HEAD_MFM();
 				LOAD_HEAD();
+				if(!get_drive().get_is_ready()) {
+					SetNotReady();
+					goto abort;
+				}
 			}
 
 			// Jump to the proper place.