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Switched to a more straightforward way of exiting from tape data loading.

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This commit is contained in:
Thomas Harte 2017-05-08 20:58:55 -04:00
parent 7b43ae0a92
commit 61f8f2f18c
1 changed files with 6 additions and 3 deletions
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9
Machines/Commodore/Vic-20/Vic20.cpp
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@ -156,6 +156,7 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
start_address = (uint16_t)(user_basic_memory_[0xc1] | (user_basic_memory_[0xc2] << 8));
end_address = (uint16_t)(user_basic_memory_[0xae] | (user_basic_memory_[0xaf] << 8));
// perform a via-processor_write_memory_map_ memcpy
uint8_t *data_ptr = data->data.data();
while(start_address != end_address) {
processor_write_memory_map_[start_address >> 10][start_address & 0x3ff] = *data_ptr;
@ -163,14 +164,16 @@ unsigned int Machine::perform_bus_operation(CPU6502::BusOperation operation, uin
start_address++;
}
// set tape status, carry and flag
user_basic_memory_[0x90] |= 0x40;
uint8_t flags = (uint8_t)get_value_of_register(CPU6502::Register::Flags);
flags &= ~(uint8_t)(CPU6502::Flag::Carry | CPU6502::Flag::Interrupt);
set_value_of_register(CPU6502::Register::Flags, flags);
set_value_of_register(CPU6502::Register::ProgramCounter, 0xfccf + 1);
*value = 0x08;
// to ensure that execution proceeds to 0xfccf, pretend a NOP was here and
// ensure that the PC leaps to 0xfccf
set_value_of_register(CPU6502::Register::ProgramCounter, 0xfccf);
*value = 0xea; // i.e. NOP implied
}
}
}