173 lines
6.3 KiB
Python
173 lines
6.3 KiB
Python
import numpy as np
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from . import errors
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from .segments import SegmentData
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from .diskimages import BaseHeader, DiskImageBase
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import logging
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log = logging.getLogger(__name__)
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class StandardDeliveryHeader(BaseHeader):
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file_format = "Apple ][ Standard Delivery"
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def __init__(self, bytes=None, sector_size=256, create=False):
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BaseHeader.__init__(self, sector_size, create=create)
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if bytes is None:
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return
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data = bytes[0:5]
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if np.all(data == (0x01, 0xa8, 0xee, 0x06, 0x08)):
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log.debug("Found 48k loader")
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else:
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raise errors.InvalidDiskImage("No %s boot header" % self.file_format)
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def __str__(self):
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return "Standard Delivery Boot Disk (size=%d (%dx%dB)" % (self.file_format, self.image_size, self.max_sectors, self.sector_size)
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def check_size(self, size):
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if size != 143360:
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raise errors.InvalidDiskImage("Incorrect size for Standard Delivery image")
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self.image_size = size
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self.tracks_per_disk = 35
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self.sectors_per_track = 16
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self.max_sectors = self.tracks_per_disk * self.sectors_per_track
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class StandardDeliveryImage(DiskImageBase):
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def __str__(self):
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return str(self.header)
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def read_header(self):
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self.header = StandardDeliveryHeader(self.bytes[0:256])
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@classmethod
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def new_header(cls, diskimage, format="DSK"):
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if format.lower() == "dsk":
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header = StandardDeliveryHeader(create=True)
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header.check_size(diskimage.size)
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else:
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raise RuntimeError("Unknown header type %s" % format)
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return header
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def check_size(self):
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pass
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def get_boot_sector_info(self):
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pass
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def get_vtoc(self):
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pass
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def get_directory(self, directory=None):
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pass
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@classmethod
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def create_boot_image(cls, segments, run_addr=None):
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raw = SegmentData(np.zeros([143360], dtype=np.uint8))
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dsk = cls(raw, create=True)
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if run_addr is None:
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run_addr = segments[0].origin
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chunks = []
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for s in segments:
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# find size in 256 byte chunks that start on a page boundary
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# since the loader only deals with page boundaries
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origin = s.origin
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chunk_start, padding = divmod(origin, 256)
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if (chunk_start == 0x20 or chunk_start == 0x40) and padding == 1:
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show_hgr = False
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padding = 0
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else:
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show_hgr = True
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size = ((len(s) + padding + 255) // 256) * 256
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chunk = np.zeros([size], dtype=np.uint8)
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chunk[padding:padding + len(s)] = s[:]
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chunks.append((chunk_start, chunk, show_hgr))
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print("segment: %s, pages=%d" % (str(s), len(chunk) // 256))
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log.debug(" last chunk=%s" % str(chunks[-1]))
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# break up the chunks into sectors
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# NOTE: fstbt implied that the sector order was staggered, but in
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# AppleWin, by trial and error, works with the following order
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# index = 1 # on the first track, sector 0 is reserved for boot sector
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# sector_order = [0, 2, 4, 6, 8, 10, 12, 14, 1, 3, 5, 7, 9, 11, 13, 15]
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index = 1
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sector_order = [0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15]
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track = 0
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count = 0
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sector_list = []
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address_list = [0xd1]
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boot_sector = dsk.header.create_sector()
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boot_sector.sector_num = 0
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boot_sector.track_num = 1
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sector_list.append(boot_sector)
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first_page_1 = True
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for chunk_start, chunk_data, show_hgr in chunks:
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count = len(chunk_data) // 256
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if chunk_start == 0x20 and count == 32 and first_page_1:
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# Assume this is an HGR screen, use interesting load effect,
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# not the usual venetian blind
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chunk_hi = [0x20, 0x24, 0x28, 0x2c, 0x30, 0x34, 0x38, 0x3c, 0x21, 0x25, 0x29, 0x2d, 0x31, 0x35, 0x39, 0x3d, 0x22, 0x26, 0x2a, 0x2e, 0x32, 0x36, 0x3a, 0x3e, 0x23, 0x27, 0x2b, 0x2f, 0x33, 0x37, 0x3b, 0x3f]
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address_order = chunk_hi
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else:
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chunk_hi = range(chunk_start, chunk_start + count)
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if len(chunk_hi) > 2:
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address_order = []
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for n in range(0, count, 32):
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subset = chunk_hi[n:n+32]
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if len(subset) > 2:
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address_order.extend([chunk_hi[n], 0xe0 + len(subset) - 1])
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else:
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address_order.extend(subset)
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else:
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address_order = chunk_hi
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for n in range(count):
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i = (chunk_hi[n] - chunk_start) * 256
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sector = dsk.header.create_sector(chunk_data[i:i+256])
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sector.sector_num = dsk.header.sector_from_track(track, sector_order[index])
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count += 1
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#sector.sector_num = count
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sector_list.append(sector)
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# sector.data[0] = sector.sector_num
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# sector.data[1] = hi
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# sector.data[2:16] = 0xff
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log.debug("%s at %02x00: %s ..." % (sector_list[-1], address_list[-1], " ".join(["%02x" % h for h in chunk_data[i:i + 16]])))
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index += 1
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if index >= len(sector_order):
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index = 0
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track += 1
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address_list.extend(address_order)
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if show_hgr:
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if chunk_start == 0x40:
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address_list.append(0xd2)
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elif chunk_start == 0x20:
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if not first_page_1:
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address_list.append(0xd1)
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first_page_1 = False
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print("fstbt commands: %s" % ", ".join(["%02x" % i for i in address_list]))
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boot_code = get_fstbt_code(boot_sector.data, address_list, run_addr)
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dsk.write_sector_list(sector_list)
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return dsk
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from . fstbt import fstbt
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def get_fstbt_code(data, address_list, run_addr):
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pointer = len(fstbt)
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data[0:pointer] = np.frombuffer(fstbt, dtype=np.uint8)
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hi, lo = divmod(run_addr, 256)
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data[pointer:pointer + 2] = (lo, hi)
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address_list.append(0xc0) # last sector flag
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data[pointer + 2:pointer + 2 + len(address_list)] = address_list
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