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https://github.com/dmolony/DiskBrowser.git
synced 2025-03-09 23:29:47 +00:00
display DOS boot sector at $800
This commit is contained in:
Denis Molony
parent
13f80145e7
commit
c44128200f
@ -5,10 +5,15 @@ import java.util.List;
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import com.bytezone.diskbrowser.disk.AbstractSector;
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import com.bytezone.diskbrowser.disk.Disk;
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import com.bytezone.diskbrowser.disk.DiskAddress;
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import com.bytezone.diskbrowser.utilities.HexFormatter;
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public class BootSector extends AbstractSector
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{
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AssemblerProgram assembler;
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private static final byte[] skew =
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{ 0x00, 0x0D, 0x0B, 0x09, 0x07, 0x05, 0x03, 0x01, 0x0E, 0x0C, 0x0A, 0x08, 0x06,
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0x04, 0x02, 0x0F, 0x00 };
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AssemblerProgram assembler1;
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AssemblerProgram assembler2;
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String name; // DOS or Prodos
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public BootSector (Disk disk, byte[] buffer, String name, DiskAddress diskAddress)
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@ -29,11 +34,25 @@ public class BootSector extends AbstractSector
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{
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StringBuilder text = new StringBuilder ();
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if (assembler == null)
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if (assembler1 == null)
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{
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int flag = buffer[0] & 0xFF;
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if (flag == 1) // apple II
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assembler = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 1);
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{
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if (matches (buffer, 0x4D, skew))
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{
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int newLen = 0x100 - (0x4D + skew.length);
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byte[] buf1 = new byte[0x4D];
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byte[] buf2 = new byte[newLen];
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System.arraycopy (buffer, 0, buf1, 0, 0x4D);
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System.arraycopy (buffer, 0x4D + skew.length, buf2, 0, newLen);
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assembler1 = new AssemblerProgram (name + " (first)", buf1, 0x800, 1);
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assembler2 =
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new AssemblerProgram (name + " (second)", buf2, 0x84D + skew.length, 0);
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}
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else
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assembler1 = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 1);
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}
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else // apple III (SOS)
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{
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byte[] newBuffer = new byte[buffer.length * 2];
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@ -43,12 +62,31 @@ public class BootSector extends AbstractSector
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System.arraycopy (buf, 0, newBuffer, buf.length, buf.length);
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buffer = newBuffer;
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assembler = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 0);
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assembler1 = new AssemblerProgram (name + " Boot Loader", buffer, 0x00, 0);
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}
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}
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text.append (assembler.getText ());
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text.append (assembler1.getText ());
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if (assembler2 != null)
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{
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text.append ("\n\n");
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text.append (HexFormatter.formatNoHeader (buffer, 0x4D, skew.length, 0x800));
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text.append ("\n\n");
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text.append (assembler2.getText ());
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}
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return text.toString ();
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}
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private boolean matches (byte[] buffer, int offset, byte[] test)
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{
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if (test.length == 0 || test.length > buffer.length - offset)
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return false;
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for (int i = 0; i < test.length; i++)
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if (test[i] != buffer[offset++])
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return false;
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return true;
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}
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}
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@ -35,11 +35,12 @@ public class AppleDisk implements Disk
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private int interleave = 0;
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private static int[][] interleaveSector = //
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{ { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, // Dos
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{ 0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15 }, // Prodos
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{ 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 15 }, // Infocom
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{ 0, 6, 12, 3, 9, 15, 14, 5, 11, 2, 8, 7, 13, 4, 10, 1 } }; // CPM
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{ { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 }, // Dos
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{ 0, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 15 }, // Prodos
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{ 0, 13, 11, 9, 7, 5, 3, 1, 14, 12, 10, 8, 6, 4, 2, 15 }, // Infocom
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{ 0, 6, 12, 3, 9, 15, 14, 5, 11, 2, 8, 7, 13, 4, 10, 1 } }; // CPM
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// Physical disk interleave:
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// Info from http://www.applelogic.org/TheAppleIIEGettingStarted.html
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// Block: 0 1 2 3 4 5 6 7 8 9 A B C D E F
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// Position: 0 8 1 9 2 A 3 B 4 C 5 D 6 E 7 F - Prodos (.PO disks)
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@ -59,6 +60,17 @@ public class AppleDisk implements Disk
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// {0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00, 0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00}
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//};
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// * TABLE OF PHYSICAL BSECTR NUMBERS
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// * WHICH CORRESPOND TO THE LOGICAL
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// * BSECTRS 0-F ON TRACK ZERO...
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// BHERE2 EQU >*
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// TABLE EQU $800+BHERE2
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// DFB $00,13,11 ;00->00,01->13,02->11
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// DFB 09,07,05 ;03->09,04->07;05->05
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// DFB 03,01,14 ;06->03,07->01,08->14
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// DFB 12,10,08 ;09->12,10->10,11->08
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// DFB 06,04,02,15 ;12->06,13->04,14->02,15->15
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private boolean[] hasData;
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private byte emptyByte = 0;
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@ -82,7 +94,7 @@ public class AppleDisk implements Disk
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int skip = 0;
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if ((pos > 0 && name.substring (pos + 1).equalsIgnoreCase ("2mg"))
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|| "2IMG".equals (prefix))
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|| "2IMG".equals (prefix))
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// if ("2IMG".equals (prefix))
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{
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if (debug)
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@ -395,7 +407,8 @@ public class AppleDisk implements Disk
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public DiskAddress getDiskAddress (int track, int sector)
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{
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// should this return null for invalid addresses?
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assert (isValidAddress (track, sector)) : "Invalid address : " + track + ", " + sector;
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assert (isValidAddress (track, sector)) : "Invalid address : " + track + ", "
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+ sector;
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return new AppleDiskAddress (this, track, sector);
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}
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@ -438,22 +451,22 @@ public class AppleDisk implements Disk
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assert da.getDisk () == this : "Disk address not applicable to this disk";
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assert sectorSize == 256 || sectorSize == 512 : "Invalid sector size : " + sectorSize;
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assert interleave >= 0 && interleave <= MAX_INTERLEAVE : "Invalid interleave : "
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+ interleave;
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+ interleave;
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if (sectorSize == 256)
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{
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int diskOffset = da.getTrack () * trackSize
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+ interleaveSector[interleave][da.getSector ()] * sectorSize;
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+ interleaveSector[interleave][da.getSector ()] * sectorSize;
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System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, sectorSize);
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}
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else if (sectorSize == 512)
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{
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int diskOffset = da.getTrack () * trackSize
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+ interleaveSector[interleave][da.getSector () * 2] * 256;
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+ interleaveSector[interleave][da.getSector () * 2] * 256;
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System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset, 256);
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diskOffset = da.getTrack () * trackSize
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+ interleaveSector[interleave][da.getSector () * 2 + 1] * 256;
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+ interleaveSector[interleave][da.getSector () * 2 + 1] * 256;
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System.arraycopy (diskBuffer, diskOffset, buffer, bufferOffset + 256, 256);
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}
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}
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@ -474,7 +487,7 @@ public class AppleDisk implements Disk
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{
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if (actionListenerList != null)
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actionListenerList
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.actionPerformed (new ActionEvent (this, ActionEvent.ACTION_PERFORMED, text));
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.actionPerformed (new ActionEvent (this, ActionEvent.ACTION_PERFORMED, text));
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}
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public AppleFileSource getDetails ()
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