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56 lines
1.3 KiB
Python
56 lines
1.3 KiB
Python
"""Representation of Apple II + player virtual machine state."""
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from typing import Iterator
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import numpy as np
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import screen
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class CycleCounter:
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"""Counts clock cycles."""
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def __init__(self):
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self.cycles = 0 # type:int
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def tick(self, cycles: int) -> None:
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"""Advance cycle counter by some number of clock ticks.
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:param cycles: How many clock cycles to advance
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"""
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self.cycles += cycles
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def reset(self) -> None:
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"""Reset cycle counter to 0."""
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self.cycles = 0
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class Machine:
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"""Represents Apple II and player virtual machine state."""
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def __init__(self, cycle_counter: CycleCounter,
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memmap: screen.MemoryMap, update_priority: np.array):
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self.page = 0x20 # type: int
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self.content = 0x7f # type: int
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self.memmap = memmap # type: screen.MemoryMap
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self.cycle_counter = cycle_counter # type: CycleCounter
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self.update_priority = update_priority # type: np.array
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def emit(self, opcode: "Opcode") -> Iterator[int]:
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"""
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:param opcode:
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:return:
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"""
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cmd = opcode.emit_command(opcode)
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if cmd:
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yield from cmd
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data = opcode.emit_data()
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if data:
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yield from data
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# Update changes in memory map, if any
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opcode.apply(self)
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