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Diffstat (limited to 'src/devices/cpu/tms9900/tms9900.cpp')
-rw-r--r--src/devices/cpu/tms9900/tms9900.cpp15
1 files changed, 6 insertions, 9 deletions
diff --git a/src/devices/cpu/tms9900/tms9900.cpp b/src/devices/cpu/tms9900/tms9900.cpp
index 49e60c1a28b..5ae5cb54f6b 100644
--- a/src/devices/cpu/tms9900/tms9900.cpp
+++ b/src/devices/cpu/tms9900/tms9900.cpp
@@ -1346,6 +1346,12 @@ void tms99xx_device::service_interrupt()
m_reset = false;
LOG("** RESET triggered\n");
+
+ // RESET could occur during a data derivation sequence, so we have to
+ // prevent the execution loop to return into that sequence by
+ // clearing the return index. This fixes a bug that leads to undefined
+ // behaviour in that situation.
+ m_caller_index = NOPRG;
}
else
{
@@ -2765,15 +2771,6 @@ uint32_t tms99xx_device::execute_max_cycles() const noexcept
return 124;
}
-uint32_t tms99xx_device::execute_input_lines() const noexcept
-{
- return 2;
-}
-
-// clocks to cycles, cycles to clocks = id
-// execute_default_irq_vector = 0
-// execute_burn = nop
-
// device_disasm_interface overrides
std::unique_ptr<util::disasm_interface> tms99xx_device::create_disassembler()