diff options
author | 2015-05-27 15:29:00 +0200 | |
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committer | 2015-05-27 15:30:48 +0200 | |
commit | efb22342e37a19a77af674fd9c822be4ef61fd87 (patch) | |
tree | 656885f1b68a7d5f3cdfc85c8cc1b11120bb4524 | |
parent | 2e772fb16078401daaf14d7a6f7ef2a6f062dbf0 (diff) |
wd_fdc: check if the timer for sector register update is already
running, fixes bbc format command
-rw-r--r-- | src/emu/machine/wd_fdc.c | 6 |
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() |