Only set DSKSYNC interrupt if it wasn't already set.

diff --git a/disk.cpp b/disk.cpp
index 8cf0caf3489797eb9b745882eb45077ac0e57f83..682d952ec3f9726cdce0d43c75d98c7a7a666235 100644 (file)
--- a/disk.cpp
+++ b/disk.cpp
@@ -4056,6 +4056,7 @@ static void wordsync_detected(bool startup)
 
 static void disk_doupdate_read_reallynothing(int floppybits, bool state)
 {
+       bool done = false;
        // Only because there is at least one demo that checks wrong bit
        // and hangs unless DSKSYNC bit it set with zero DSKSYNC value...
        if (INTREQR() & 0x1000)
@@ -4079,8 +4080,9 @@ static void disk_doupdate_read_reallynothing(int floppybits, bool state)
                        dskbytr_val = word & 0xff;
                        dskbytr_val |= 0x8000;
                }
-               if (!(adkcon & 0x200) && word == dsksync) {
+               if (!done && !(adkcon & 0x200) && word == dsksync) {
                        INTREQ(0x8000 | 0x1000);
+                       done = true;
                }
                bitoffset++;
                bitoffset &= 15;