From 462d66c5497826cdc37853de9e45e4c99c877a04 Mon Sep 17 00:00:00 2001
From: Asnivor <coding@asnitech.co.uk>
Date: Tue, 1 May 2018 13:42:21 +0100
Subject: [PATCH] ZXHawk: UPD ReadDiagnostic fix (more Alkatraz protected games
 now load)

---
 .../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 197d761907..2446067b72 100644
--- a/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs
+++ b/BizHawk.Emulation.Cores/Computers/SinclairSpectrum/Hardware/Disk/NECUPD765.FDC.cs
@@ -1313,7 +1313,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
                         // read the whole track
                         for (int i = 0; i < track.Sectors.Length; i++)
                         {
-                            if (secCount > ActiveCommandParams.EOT)
+                            if (secCount >= ActiveCommandParams.EOT)
                             {
                                 break;
                             }
@@ -2821,7 +2821,7 @@ 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;
@@ -2832,6 +2832,7 @@ 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
@@ -2841,6 +2842,7 @@ namespace BizHawk.Emulation.Cores.Computers.SinclairSpectrum
                         Status0 = 192;
                         ResBuffer[0] = Status0;
                     }
+                    */
                     else if (ActiveDrive.SeekStatus == SEEK_IDLE)
                     {
                         // SIS with no interrupt