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-rw-r--r--src/emu/machine/wd_fdc.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/src/emu/machine/wd_fdc.c b/src/emu/machine/wd_fdc.c
index 204c4c4281c..73d4a540980 100644
--- a/src/emu/machine/wd_fdc.c
+++ b/src/emu/machine/wd_fdc.c
@@ -1130,7 +1130,11 @@ void wd_fdc_t::sector_w(UINT8 val)
// return;
sector_buffer = val;
- delay_cycles(t_sector, dden ? delay_register_commit*2 : delay_register_commit);
+
+ // set a timer to write the new value to the register, but only if we aren't in
+ // the middle of an already occurring update
+ if (!t_sector->enabled())
+ delay_cycles(t_sector, dden ? delay_register_commit*2 : delay_register_commit);
}
UINT8 wd_fdc_t::sector_r()