/*
 * 	6502 Based Virtual Computer
 *	Copyright (C) 2011  Scott C. Duensing <scott@jaegertech.com>
 *	
 *	This program is free software; you can redistribute it and/or modify
 *	it under the terms of the GNU General Public License as published by
 *	the Free Software Foundation; either version 2 of the License, or
 *	(at your option) any later version.
 *	
 *	This program is distributed in the hope that it will be useful,
 *	but WITHOUT ANY WARRANTY; without even the implied warranty of
 *	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *	GNU General Public License for more details.
 *	
 *	You should have received a copy of the GNU General Public License along
 *	with this program; if not, write to the Free Software Foundation, Inc.,
 *	51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

// Try it out!

// Declare components of our computer.
console.log("Creating components.");
var memory = new ram(64 * 1024);
var cpu = new cpu6502();
var monitor = new textDisplay();
var keys = new keyboard();
var random = new prng();
var timer = new clock();
console.log("Creating components - success!");

// Memory Map (64k):
var MM_ZERO_PAGE          = 0x0000;
var MM_STACK              = 0x0100;
var MM_CODE_START         = 0x0200;
var MM_HEAP_END           = 0xdfff;
var MM_DISPLAY_ADAPTER    = 0xe000;
var MM_DISPLAY_DATA       = MM_DISPLAY_ADAPTER + monitor.getMemoryNeeded() - 2;
var MM_DISPLAY_COMMAND    = MM_DISPLAY_DATA + 1;
var MM_KEYBOARD_CHARACTER = MM_DISPLAY_COMMAND + 1;
var MM_KEYBOARD_META      = MM_KEYBOARD_CHARACTER + 1;
var MM_PRNG               = MM_KEYBOARD_META + 1;
var MM_CLOCK              = MM_PRNG + 1;
var MM_ROM_START          = 0xf000;
var MM_ROM_END            = 0xfff9;
var MM_NMI_VECTOR         = 0xfffa;
var MM_RESET_VECTOR       = 0xfffc;
var MM_IRQ_VECTOR         = 0xfffe;

console.log("MM_IRQ_VECTOR         = 0x" + MM_IRQ_VECTOR.toString(16));
console.log("MM_RESET_VECTOR       = 0x" + MM_RESET_VECTOR.toString(16));
console.log("MM_NMI_VECTOR         = 0x" + MM_NMI_VECTOR.toString(16));
console.log("MM_ROM_END            = 0x" + MM_ROM_END.toString(16));
console.log("MM_ROM_START          = 0x" + MM_ROM_START.toString(16));
console.log("MM_CLOCK              = 0x" + MM_CLOCK.toString(16));
console.log("MM_PRNG               = 0x" + MM_PRNG.toString(16));
console.log("MM_KEYBOARD_META      = 0x" + MM_KEYBOARD_META.toString(16));
console.log("MM_KEYBOARD_CHARACTER = 0x" + MM_KEYBOARD_CHARACTER.toString(16));
console.log("MM_DISPLAY_COMMAND    = 0x" + MM_DISPLAY_COMMAND.toString(16));
console.log("MM_DISPLAY_DATA       = 0x" + MM_DISPLAY_DATA.toString(16));
console.log("MM_DISPLAY_ADAPTER    = 0x" + MM_DISPLAY_ADAPTER.toString(16));
console.log("MM_HEAP_END           = 0x" + MM_HEAP_END.toString(16));
console.log("MM_CODE_START         = 0x" + MM_CODE_START.toString(16));
console.log("MM_STACK              = 0x" + MM_STACK.toString(16));
console.log("MM_ZERO_PAGE          = 0x" + MM_ZERO_PAGE.toString(16));

// Configure components & connect them together.
cpu.attach(memory, MM_CODE_START, function(event){
	// We don't care about events just yet.
	var message = "Event " + event + " @ 0x" + cpu.getPC().toString(16) + " = " + memory.readByte(cpu.getPC()).toString(16);
	console.log(message);
	alert(message);
});
monitor.attach(memory, MM_DISPLAY_ADAPTER, "display");
keys.attach(memory, MM_KEYBOARD_CHARACTER);
random.attach(memory, MM_PRNG);
timer.attach(memory, MM_CLOCK, 0x100);

// Power on!
memory.reset();
cpu.reset();

// Make it do something!
var HELLO_WORLD =  [0xA2, 0x00, 0xBD, 0x14, 0x02, 0xF0, 0x0B, 0x8D, 0xA0, 0xEF, 0xA9, 0x07,
                    0x8D, 0xA1, 0xEF, 0xE8, 0xD0, 0xF0, 0x00, 0x00, 0x48, 0x65, 0x6C, 
                    0x6C, 0x6F, 0x2C, 0x20, 0x77, 0x6F, 0x72, 0x6C, 0x64, 0x21, 0x00];

for (var x=0; x<HELLO_WORLD.length; x++) {
	memory.writeByte(MM_CODE_START + x, HELLO_WORLD[x]);
}
console.log("Code loaded.");

/*
// Load EhBASIC into RAM at 0xD000.
for (var x=0; x<PROGRAM.length; x++) {
	memory.writeByte(0xD000 + x, PROGRAM[x]);
}
console.log("Code loaded.");
*/

cpu.run();