From 451d5654ce5e409544fd65d35047bb04a93bacb6 Mon Sep 17 00:00:00 2001
From: Asnivor <coding@asnitech.co.uk>
Date: Tue, 1 May 2018 08:03:14 +0100
Subject: [PATCH] ZXHawk: modifications to UPD sense interrupt status
 instruction

---
 .../SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs         | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs
index 83269135d3..38a74ca56a 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs
@@ -2669,7 +2669,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
                     {
                         // interrupt has been raised for this drive
                         // acknowledge
-                        ActiveDrive.SeekStatus = SEEK_INTACKNOWLEDGED;
+                        ActiveDrive.SeekStatus = SEEK_IDLE;// SEEK_INTACKNOWLEDGED;
 
                         // result length 2
                         ResLength = 2;
@@ -2680,6 +2680,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
                         // second byte is the current track id
                         ResBuffer[1] = ActiveDrive.CurrentTrackID;
                     }
+                    /*
                     else if (ActiveDrive.SeekStatus == SEEK_INTACKNOWLEDGED)
                     {
                         // DriveA interrupt has already been acknowledged
@@ -2689,7 +2690,8 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
                         Status0 = 192;
                         ResBuffer[0] = Status0;
                     }
-                    else if (ActiveDrive.SeekStatus == SEEK_IDLE)
+                    */
+                    else //if (ActiveDrive.SeekStatus == SEEK_IDLE)
                     {
                         // SIS with no interrupt
                         ResLength = 1;