DSKSYNC on/off detection during read

diff --git a/disk.cpp b/disk.cpp
index 201ff08ef509e56f7381c041e28315c6390decb3..22470d49259ece9cdb3849fcbfe872b4cee14253 100644 (file)
--- a/disk.cpp
+++ b/disk.cpp
@@ -4031,6 +4031,7 @@ static void disk_doupdate_predict (int startcycle)
                bool isempty = drive_empty(drv);
                bool isunformatted = unformatted(drv);
                int mfmpos = drv->mfmpos;
+               bool dsksync_on2 = dsksync_on;
                if (drv->tracktiming[0])
                        updatetrackspeed (drv, mfmpos);
                int diskevent_flag = 0;
@@ -4050,8 +4051,13 @@ static void disk_doupdate_predict (int startcycle)
                                        else
                                                tword |= getonebit(drv, drv->bigmfmbuf, mfmpos, &inc);
                                }
-                               if (dskdmaen != DSKDMA_READ && (tword & 0xffff) == dsksync && dsksync != 0)
+                               if ((tword & 0xffff) != dsksync) {
+                                       dsksync_on2 = false;
+                               }
+                               if (dskdmaen != DSKDMA_READ && (tword & 0xffff) == dsksync && !dsksync_on2) {
                                        diskevent_flag |= DISK_WORDSYNC;
+                                       dsksync_on2 = true;
+                               }
                        }
                        int pmfmpos = mfmpos;
                        mfmpos += inc;