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-rw-r--r--src/mame/drivers/hh_hmcs40.cpp8
1 files changed, 5 insertions, 3 deletions
diff --git a/src/mame/drivers/hh_hmcs40.cpp b/src/mame/drivers/hh_hmcs40.cpp
index 88737aab60c..9aa3ffb62bb 100644
--- a/src/mame/drivers/hh_hmcs40.cpp
+++ b/src/mame/drivers/hh_hmcs40.cpp
@@ -75,12 +75,14 @@
- gckong random lockups (tap the jump button repeatedly): mcu stack overflow,
works ok if stack levels is increased, 38800 B rev. has more stack levels?
Or it could be a race condition: irq happening too late/early.
- - bultrman building explosions are wrong, especially visible on the first one
- epacman booting the game in demo mode, pacman should go straight to the
upper-left power pill: mcu cycle/interrupt timing related
- - Though very uncommon when compared to games with LED/lamp display,
- some games may manipulate VFD plate brightness by strobing it longer,
+ - Though very uncommon when compared to games with LED/lamp display, some
+ games may manipulate VFD plate brightness by strobing it longer/shorter,
eg. cgalaxn when the player ship explodes.
+ - Related to the above issue: bultrman sometimes strobes D0/D1/D2 for a very
+ short duration, causing (unwanted) dimly lit segments on the real machine.
+ On MAME they will show with full brightness, see eg. building explosions.
- bzaxxon 3D effect is difficult to simulate
***************************************************************************/