CIA TOD clock sync fix

diff --git a/cia.cpp b/cia.cpp
index c5c74e3dc932ef8ab065280a394193682285bd32..8bcec3860c366e9391c06dbd678486bc2ccd4967 100644 (file)
--- a/cia.cpp
+++ b/cia.cpp
@@ -814,12 +814,12 @@ static bool cia_checkalarm(bool inc, bool irq, int num)
 {
        struct CIA *c = &cia[num];
 
+#if 0
        // hack: do not trigger alarm interrupt if KS code and both
        // tod and alarm == 0. This incorrectly triggers on non-cycle exact
        // modes. Real hardware value written to ciabtod by KS is always
        // at least 1 or larger due to bus cycle delays when reading
        // old value.
-#if 0
        if (num) {
                if (!currprefs.cpu_compatible && (munge24(m68k_getpc()) & 0xFFF80000) != 0xF80000) {
                        if (c->tod == 0 && c->alarm == 0)
@@ -935,7 +935,7 @@ static void do_tod_hack(bool dotod)
                cia[0].tod++;
                cia[0].tod &= 0x00ffffff;
                tod_hack_tod_last = cia[0].tod;
-               cia_checkalarm(false, false, 0);
+               cia_checkalarm(false, true, 0);
        }
 }