public virtual void Walk()
{
Walk6502.Reset();
ushort addr = (ushort)((memory[0xFFFC] | (memory[0xFFFD] << 8))); // RESET vector
Walk6502.Walk(this, addr);
}
// Commodore 64 - walk Kernal Reset vector, MAIN, CRUNCH, GONE (EXECUTE), Statements, Functions, and Operators BASIC ROM code
public override void Walk()
{
// in case cpu has not been reset, manually initialize low memory that will be called by BASIC and KERNAL ROM
for (int i = 0; i < 0x18; ++i)
{
memory[(ushort)(0x73 + i)] = memory[(ushort)(0xE3A2 + i)]; // CHARGET
}
memory[0x300] = LO(0xE38B); // ERROR
memory[0x301] = HI(0xE38B);
memory[0x302] = LO(0xA483); // MAIN
memory[0x303] = HI(0xA483);
memory[0x304] = LO(0xA57C); // CRUNCH
memory[0x305] = HI(0xA57C);
memory[0x306] = LO(0xA71A); // QPLOP
memory[0x307] = HI(0xA71A);
memory[0x308] = LO(0xA7E4); // GONE
memory[0x309] = HI(0xA7E4);
memory[0x30A] = LO(0xAE86); // EVAL
memory[0x30B] = HI(0xAE86);
memory[0x31A] = LO(0xF34A); // OPEN
memory[0x31B] = HI(0xF34A);
memory[0x31C] = LO(0xF291); // CLOSE
memory[0x31D] = HI(0xF291);
memory[0x31E] = LO(0xF20E); // CHKIN
memory[0x31F] = HI(0xF20E);
memory[0x320] = LO(0xF250); // CKOUT
memory[0x321] = HI(0xF250);
memory[0x322] = LO(0xF333); // CHECK STOP
memory[0x323] = HI(0xF333);
memory[0x324] = LO(0xF157); // CHRIN
memory[0x325] = HI(0xF157);
memory[0x326] = LO(0xF1CA); // CHROUT
memory[0x327] = HI(0xF1CA);
memory[0x328] = LO(0xF6ED); // STOP
memory[0x329] = HI(0xF6ED);
memory[0x32A] = LO(0xF13E); // GETIN
memory[0x32B] = HI(0xF13E);
memory[0x32C] = LO(0xF32F); // CLALL
memory[0x32D] = HI(0xF32F);
memory[0x330] = LO(0xF4A5); // LOAD
memory[0x331] = HI(0xF4A5);
memory[0x332] = LO(0xF5ED); // SAVE
memory[0x333] = HI(0xF5ED);
base.Walk(); // reset seen, and walk the RESET vector
ushort addr;
addr = (ushort)(memory[0xFFFE] | (memory[0xFFFF] << 8)); // IRQ
Walk6502.Walk(this, addr);
addr = (ushort)(memory[0xFFFA] | (memory[0xFFFB] << 8)); // NMI
Walk6502.Walk(this, addr);
// Portion of MAIN, CRUNCH and GONE(Execute) or MAIN1(Store line)
Walk6502.Walk(this, 0xA494);
for (ushort table = 0xA00C; table < 0xA051; table += 2) // BASIC Statements
{
addr = (ushort)((memory[table] | (memory[(ushort)(table + 1)] << 8)) + 1); // put on stack for RTS, so must add one
Walk6502.Walk(this, addr);
}
for (ushort table = 0xA052; table < 0xA07F; table += 2) // Function Dispatch
{
addr = (ushort)((memory[table] | (memory[(ushort)(table + 1)] << 8)));
Walk6502.Walk(this, addr);
}
for (ushort table = 0xA080; table < 0xA09D; table += 3) // Operator Dispatch
{
addr = (ushort)((memory[(ushort)(table + 1)] | (memory[(ushort)(table + 2)] << 8)) + 1); // put on stack for RTS, so must add one
Walk6502.Walk(this, addr);
}
}
static void Main(string[] args)
{
// recommend get basic, kernal, etc. ROM files from a emulator such as https://vice-emu.sourceforge.io/index.html#download
Emu6502 cbm = null;
bool error = false;
int ram_size = 0;
Console.Error.WriteLine("6502 Emulator for Windows Console");
Console.Error.WriteLine("C64, VIC-20, PET, TED, ...");
Console.Error.WriteLine("");
Console.Error.WriteLine("simple-emu-c64 version 1.7");
Console.Error.WriteLine("Copyright (c) 2020 David R. Van Wagner");
Console.Error.WriteLine("davevw.com");
Console.Error.WriteLine("Open Source, MIT License");
Console.Error.WriteLine("github.com/davervw/simple-emu-c64");
Console.Error.WriteLine("");
try
{
if (args.Length > 2 && args[1].ToLower() == "ram")
{
ram_size = int.Parse(args[2]) * 1024;
}
if (args.Length == 0 || args[0].ToLower() == "c64")
{
if (ram_size == 0)
{
ram_size = 64 * 1024;
}
if (File.Exists("basic") && File.Exists("kernal") && (!File.Exists("c64\\basic") || !File.Exists("c64\\kernal")))
{
cbm = new EmuC64(ram_size: ram_size, basic_file: "basic", chargen_file: "c64\\chargen", kernal_file: "kernal");
}
else
{
cbm = new EmuC64(ram_size: ram_size, basic_file: "c64\\basic", chargen_file: "c64\\chargen", kernal_file: "c64\\kernal");
}
if ((args.Length == 2 || args.Length == 4) && (File.Exists(args[args.Length - 1]) || File.Exists(args[args.Length - 1] + ".prg")))
{
((EmuC64)cbm).StartupPRG = args[args.Length - 1];
}
}
else if (args.Length > 0 && args[0].ToLower() == "vic20")
{
cbm = new EmuVIC20(ram_size: ram_size, char_file: "vic20\\chargen", basic_file: "vic20\\basic", kernal_file: "vic20\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "c16")
{
if (ram_size == 0)
{
ram_size = 16 * 1024;
}
cbm = new EmuTED(ram_size: ram_size, basic_file: "ted\\basic", kernal_file: "ted\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "plus4" || args[0].ToLower() == "ted")
{
if (ram_size == 0)
{
ram_size = 64 * 1024;
}
cbm = new EmuTED(ram_size: ram_size, basic_file: "ted\\basic", kernal_file: "ted\\kernal");
}
else if (args.Length > 0 && args[0].ToLower() == "pet")
{
if (ram_size == 0)
{
ram_size = 8 * 1024;
}
cbm = new EmuPET(ram_size: ram_size, basic_file: "pet\\basic1", edit_file: "pet\\edit1g", kernal_file: "pet\\kernal1");
}
else
{
error = true;
}
}
catch (Exception ex)
{
Console.Error.WriteLine(ex.ToString());
error = true;
}
if (error)
{
return;
}
else if (args.Length == 0) // if no arguments present, then show usage as well
{
Console.Error.WriteLine("");
Console.Error.WriteLine("Usage:");
Console.Error.WriteLine(" simple-emu-c64 (no arguments pauses, then starts c64)");
Console.Error.WriteLine(" simple-emu-c64 help (shows usage)");
Console.Error.WriteLine(" simple-emu-c64 [system] {ram #} (system=[c64|vic20|pet|c16|plus4|ted])");
Console.Error.WriteLine(" simple-emu-c64 [system] walk [addr 1 ...]");
Console.Error.WriteLine("");
Console.WriteLine();
}
if (args.Length >= 2 && args[1].ToLower() == "walk")
{
if (args.Length == 2)
{
cbm.Walk();
}
else
{
Walk6502.Reset();
for (int i = 2; i < args.Length; ++i)
{
Walk6502.Walk(cbm, ParseAddr(args[i]));
}
}
}
else
{
cbm.ResetRun();
}
}