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hmcs40: fix possible issue with irq/lpu (nw)

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This commit is contained in:
hap 2017-05-12 22:33:29 +02:00
parent baa7178053
commit 1cd85518e3
3 changed files with 3 additions and 3 deletions
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2
src/devices/cpu/hmcs40/hmcs40.cpp
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@ -578,7 +578,7 @@ void hmcs40_cpu_device::execute_run()
while (m_icount > 0) while (m_icount > 0)
{ {
// LPU is handled 1 cycle later // LPU is handled 1 cycle later
if ((m_prev_op & 0x3e0) == 0x340) if ((m_prev_op & 0x7e0) == 0x340)
m_pc = ((m_page << 6) | (m_pc & 0x3f)) & m_pcmask; m_pc = ((m_page << 6) | (m_pc & 0x3f)) & m_pcmask;
// remember previous state // remember previous state

2
src/devices/cpu/hmcs40/hmcs40op.cpp
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@ -465,7 +465,7 @@ void hmcs40_cpu_device::op_lpu()
if (m_s) if (m_s)
m_page = m_op & 0x1f; m_page = m_op & 0x1f;
else else
m_op = 0; // fake nop m_op |= 0x400; // indicate unhandled LPU
} }
void hmcs40_cpu_device::op_tbr() void hmcs40_cpu_device::op_tbr()

2
src/mame/drivers/hh_hmcs40.cpp
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@ -75,7 +75,7 @@
- gckong random lockups (tap the jump button repeatedly): mcu stack overflow, - 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? 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. Or it could be a race condition: irq happening too late/early.
- epacman booting the game in demo mode, pacman should go straight to the - epacman2 booting the game in demo mode, pacman should go straight to the
upper-left power pill: mcu cycle/interrupt timing related upper-left power pill: mcu cycle/interrupt timing related
- Though very uncommon when compared to games with LED/lamp display, some - Though very uncommon when compared to games with LED/lamp display, some
games may manipulate VFD plate brightness by strobing it longer/shorter, games may manipulate VFD plate brightness by strobing it longer/shorter,