Version 1.0.9 - changes by Nick
- fixed disk speed-up bug (Sherwood Forest reads with the drive motor off) - added check for 2IMG header ID - fixed processor status bugs in BRK, PLP, RTI, NMI, IRQ
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@ -2,7 +2,7 @@
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/**
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* AppleIIGo
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* Display processing
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* (C) 2006 by Marc S. Ressl (mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl (mressl@gmail.com)
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* Released under the GPL
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*/
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@ -2,13 +2,18 @@
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/**
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* AppleIIGo
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* The Java Apple II Emulator
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* Copyright 2011 by Nick Westgate (Nick.Westgate@gmail.com)
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* Copyright 2014 by Nick Westgate (Nick.Westgate@gmail.com)
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* Copyright 2006 by Marc S. Ressl (mressl@gmail.com)
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* Released under the GNU General Public License version 2
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* See http://www.gnu.org/licenses/
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*
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* Change list:
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*
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* Version 1.0.9 - changes by Nick:
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* - fixed disk speed-up bug (Sherwood Forest reads with the drive motor off)
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* - added check for 2IMG header ID
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* - fixed processor status bugs in BRK, PLP, RTI, NMI, IRQ
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*
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* Version 1.0.8 - changes by Nick:
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* - implemented disk writing (only in memory, not persisted)
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* - added support for .2MG (2IMG) disk images, including lock flag and volume number
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@ -80,7 +85,7 @@ public class AppleIIGo extends Applet implements KeyListener, ComponentListener,
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private static final long serialVersionUID = -3302282815441501352L;
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final String version = "1.0.8";
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final String version = "1.0.9";
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final String versionString = "AppleIIGo Version " + version;
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final String metaStart = "_meta_";
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@ -2,7 +2,7 @@
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/**
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* AppleIIGo
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* Speaker processing
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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*/
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@ -2,8 +2,8 @@
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/**
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* AppleIIGo
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* Disk II Emulator
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* (C) 2011 by Nick Westgate (Nick.Westgate@gmail.com)
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* Copyright 2014 by Nick Westgate (Nick.Westgate@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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* Based on work by Doug Kwan
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*/
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@ -38,6 +38,7 @@ public class DiskII extends Peripheral {
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private static final int DOS_NUM_TRACKS = 35;
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private static final int DOS_TRACK_BYTES = 256 * DOS_NUM_SECTORS;
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private static final int RAW_TRACK_BYTES = 0x1A00; // 0x1A00 (6656) for .NIB (was 6250)
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private static final int STANDARD_2IMG_HEADER_ID = 0x32494D47;
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private static final int STANDARD_2IMG_HEADER_SIZE = 64;
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private static final int STANDARD_PRODOS_BLOCKS = 280;
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@ -168,20 +169,8 @@ public class DiskII extends Peripheral {
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break;
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}
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if ((address & 1) == 0)
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{
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// only even addresses return the latch
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if (isMotorOn)
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{
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return latchData;
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}
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// simple hack to fool DOS SAMESLOT drive spin check (usually at $BD34)
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driveSpin = !driveSpin;
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return driveSpin ? 0x7E : 0x7F;
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}
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return rand.nextInt(256); // TODO: floating bus
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return ((address & 1) == 0) ? latchData : rand.nextInt(256); // TODO: floating bus
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}
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/**
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@ -247,7 +236,10 @@ public class DiskII extends Peripheral {
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* Reset peripheral
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*/
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public void reset() {
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ioRead(0x8);
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drive = 0;
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isMotorOn = false;
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loadMode = false;
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writeMode = false;
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}
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/**
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@ -266,6 +258,10 @@ public class DiskII extends Peripheral {
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byte[] header = new byte[STANDARD_2IMG_HEADER_SIZE];
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is.readFully(header, 0, STANDARD_2IMG_HEADER_SIZE);
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int id = (header[0x00] << 24) | (header[0x01] << 16) | (header[0x02] << 8) | (header[0x03]);
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if (id != STANDARD_2IMG_HEADER_ID)
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return false;
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int headerSize = (header[0x09] << 8) | (header[0x08]);
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if (headerSize != STANDARD_2IMG_HEADER_SIZE)
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return false;
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@ -352,6 +348,17 @@ public class DiskII extends Peripheral {
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loadMode = false;
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if (!writeMode)
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{
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if (!isMotorOn)
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{
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// simple hack to fool DOS SAMESLOT drive spin check (usually at $BD34)
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driveSpin = !driveSpin;
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if (driveSpin)
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{
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latchData = 0x7F;
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return;
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}
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}
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// Read data: C0xE, C0xC
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latchData = (realTrack[currNibble] & 0xff);
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@ -1,12 +1,14 @@
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import java.io.PrintWriter;
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/**
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* AppleIIGo
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* Apple II Emulator for J2SE
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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* Adapted from code by Doug Kwan
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* Adapted from code by Randy Frank randy@tessa.iaf.uiowa.edu
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* Adapted from code (C) 1989 Ben Koning [556498717 408/738-1763 ben@apple.com]
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* Adapted from code Copyright 1989 Ben Koning [556498717 408/738-1763 ben@apple.com]
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*/
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public class Em6502 {
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@ -78,6 +80,7 @@ public class Em6502 {
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public static final int FLAG_I = (1 << 2);
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public static final int FLAG_D = (1 << 3);
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public static final int FLAG_B = (1 << 4);
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public static final int FLAG_R = (1 << 6);
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public static final int FLAG_V = (1 << 6);
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public static final int FLAG_N = (1 << 7);
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/*
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* Constructor
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*/
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public Em6502() {
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// createRunFile();
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// Init BCD tables
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BCDTableAdd = new int[512];
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BCDTableSub = new int[512];
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BCDTableSub[i] = ((i & 0x0f) <= 0x09) ? i : (i - 0x06);
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BCDTableSub[i] -= ((BCDTableSub[i] & 0xf0) <= 0x90) ? 0 : 0x60;
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}
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// Init CPU
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S = 0xFF;
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P = FLAG_B | FLAG_R;
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}
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/*
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clock++;
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}
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// private PrintWriter runFile;
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// private void createRunFile()
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// {
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// try
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// {
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// runFile = new PrintWriter("C:\\Users\\Public\\AppleIIGoRun.txt");
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// }
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// catch (Exception ex)
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// {
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// // swallow
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// }
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// }
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// private final void writeRunFile(int opcode)
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// {
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// if (
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// (PC > 0x0500)
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// &&
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// (PC < 0x0600)
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// )
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// {
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// setN(getFN());
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// setZ(getFZ());
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// setC(getFC());
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//
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// runFile.printf("%04X-%02X P=%02X A=%02X\r\n", PC, opcode, P, A);
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// runFile.flush();
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// }
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// }
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/** This executes a single instruction. */
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private final void executeInstruction() {
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opcode = memoryRead(PC);
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// writeRunFile(opcode);
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PC++;
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switch(opcode) {
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setN(getFN());
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setZ(getFZ());
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setC(getFC());
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setB(true);
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push(P);
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push(P); // break flag is always set
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setI(true);
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PC = memoryRead(0xfffe);
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PC |= memoryRead(0xffff) << 8;
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break;
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case 0x28: // PLP
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P = pop() | 0x20; // fix bug in bit5 of P
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P = pop() | FLAG_B | FLAG_R; // fix bug in bit5 of P
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setFC(getC());
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setFNZ(getN(), getZ());
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clock += 4;
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break;
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case 0x40: // RTI
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P = pop() | 0x20; // bit 5 bug of 6502
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P = pop() | FLAG_B | FLAG_R; // bit 5 bug of 6502
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setFC(getC());
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setFNZ(getN(), getZ());
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PC = pop(); // splitting is necessary
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if ((exceptionRegister & SIG_6502_RESET) != 0) {
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onReset();
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PC = memoryRead(0xfffc);
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PC |= (memoryRead(0xfffd) << 8);
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S = (S - 3) & 0xff;
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setI(true);
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setD(false); // not on NMOS 6502
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setFC(getC());
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setFNZ(getN(), getZ());
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S = (S - 3) & 0xff;
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setI(true);
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PC = memoryRead(0xfffc);
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PC |= (memoryRead(0xfffd) << 8);
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clock += 7;
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exceptionRegister &= ~SIG_6502_RESET;
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}
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setN(getFN());
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setZ(getFZ());
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setC(getFC());
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push(P);
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push(P & ~FLAG_B);
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setI(true);
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PC = memoryRead(0xfffa);
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PC |= memoryRead(0xfffb) << 8;
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clock += 7;
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setN(getFN());
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setZ(getFZ());
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setC(getFC());
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setB(false);
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push(P);
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push(P & ~FLAG_B);
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setI(true);
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PC = memoryRead(0xfffe);
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PC |= memoryRead(0xffff) << 8;
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/**
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* AppleIIGo
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* Apple II Emulator for J2ME
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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*/
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@ -2,7 +2,7 @@
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/**
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* AppleIIGo
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* Apple II Emulator for J2ME
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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*/
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@ -2,7 +2,7 @@
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/**
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* AppleIIGo
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* Slot interface
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* (C) 2006 by Marc S. Ressl(mressl@gmail.com)
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* Copyright 2006 by Marc S. Ressl(mressl@gmail.com)
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* Released under the GPL
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* Based on work by Steven E. Hugg
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*/
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