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Fix applesoft execution problem (needed to clear variable pointers!)

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badvision 2016-11-05 10:46:58 -05:00
parent ab5d3472c0
commit fe062e2d15
1 changed files with 29 additions and 12 deletions
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39
src/main/java/jace/applesoft/ApplesoftProgram.java
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@ -41,6 +41,9 @@ public class ApplesoftProgram {
List<Line> lines = new ArrayList<>();
public static final int startingAddressPointer = 0x067;
public static final int VARIABLE_TABLE = 0x069;
public static final int ARRAY_TABLE = 0x06b;
public static final int VARIABLE_TABLE_END = 0x06d;
public static final int BASIC_RUN = 0x0e000;
int startingAddress = 0x0801;
@ -119,20 +122,22 @@ public class ApplesoftProgram {
public static ApplesoftProgram fromString(String programSource) {
ApplesoftProgram program = new ApplesoftProgram();
for (String line : programSource.split("\\n")) {
if (line.trim().isEmpty()) continue;
if (line.trim().isEmpty()) {
continue;
}
program.lines.add(Line.fromString(line));
}
//correct line linkage
for (int i=0; i < program.lines.size(); i++) {
for (int i = 0; i < program.lines.size(); i++) {
if (i > 0) {
program.lines.get(i).setPrevious(program.lines.get(i-1));
program.lines.get(i).setPrevious(program.lines.get(i - 1));
}
if (i < program.lines.size()-1) {
program.lines.get(i).setNext(program.lines.get(i+1));
if (i < program.lines.size() - 1) {
program.lines.get(i).setNext(program.lines.get(i + 1));
}
}
return program;
};
}
public void run() {
RAM memory = Emulator.computer.memory;
@ -140,10 +145,10 @@ public class ApplesoftProgram {
int pos = memory.readWordRaw(startingAddressPointer);
for (Line line : lines) {
int nextPos = pos + line.getLength() + 1;
memory.write(pos++, (byte) (nextPos & 0x0ff), false, true);
memory.write(pos++, (byte) (nextPos>>8 & 0x0ff), false, true);
memory.write(pos++, (byte) (line.getNumber() & 0x0ff), false, true);
memory.write(pos++, (byte) (line.getNumber() >> 8 & 0x0ff), false, true);
memory.writeWord(pos, nextPos, false, true);
pos += 2;
memory.writeWord(pos, line.getNumber(), false, true);
pos += 2;
boolean isFirst = true;
for (Command command : line.getCommands()) {
if (!isFirst) {
@ -160,8 +165,20 @@ public class ApplesoftProgram {
memory.write(pos++, (byte) 0, false, true);
memory.write(pos++, (byte) 0, false, true);
memory.write(pos++, (byte) 0, false, true);
clearVariables(pos);
// Emulator.computer.cpu.setProgramCounter(BASIC_RUN);
Emulator.computer.resume();
}
/**
* Rough approximation of the CLEAR command at $D66A.
* http://www.txbobsc.com/scsc/scdocumentor/D52C.html
* @param programEnd Program ending address
*/
private void clearVariables(int programEnd) {
RAM memory = Emulator.computer.memory;
memory.writeWord(ARRAY_TABLE, programEnd, false, true);
memory.writeWord(VARIABLE_TABLE, programEnd, false, true);
memory.writeWord(VARIABLE_TABLE_END, programEnd, false, true);
}
}